toggle visibility Search & Display Options

Select All    Deselect All
 |   | 
Details
   print
  Records Links
Author Aguilos, M.; Hérault, B.; Burban, B.; Wagner, F.; Bonal, D. url  doi
openurl 
  Title What drives long-term variations in carbon flux and balance in a tropical rainforest in French Guiana? Type Journal Article
  Year 2018 Publication (up) Agricultural and Forest Meteorology Abbreviated Journal  
  Volume 253–254 Issue Pages 114-123  
  Keywords Tropical rainforest; Nee; Gpp; Ecosystem respiration; Radiation; Drought  
  Abstract A thorough understanding of how tropical forests respond to climate is important to improve ecosystem process models and to reduce uncertainties in current and future global carbon balance calculations. The Amazon rainforest, a major contributor to the global carbon cycle, is subject to strong intra- and interannual variations in climate conditions. Understanding their effect on carbon fluxes between the ecosystem and the atmosphere and on the resulting carbon balance is still incomplete. We examined the long-term (over a 12-year period; 2004–2015) variations in gross primary productivity (GPP), ecosystem respiration (RE) and net ecosystem exchange (NEE) in a tropical rainforest in French Guiana and identified key climatic drivers influencing the changes. The study period was characterized by strong differences in climatic conditions among years, particularly differences in the intensity of the dry and wet seasons, as well as differences in annual carbon fluxes and balance. Annual average GPP varied from 3384.9?g?C?m-2?yr?1 (95% CI [3320.7, 3445.9]) to 4061.2?g?C?m-2?yr?1 (95% CI [3980.1, 4145.0]). RE varied even more than GPP, with a difference of 933.1?C?m-2?yr?1 between the minimum (3020.6?g?C?m-2?yr?1; 95% CI [2889.4, 3051.3]) and maximum (3953.7?g?C?m-2?yr?1; 95% CI [3887.6, 4019.6]) values. Although NEE showed large interannual variability (nine-fold), from ?65.6?g?C?m-2?yr?1 (95% CI [?4.4, ?126.0]) to ?590.5?g?C?m-2 yr?1 (95% CI [?532.3, ?651.6]), the forest remained a carbon sink over the 12-year period. A combination of global radiation (Rg), relative extractable water (REW) and soil temperature (Ts) explained 51% of the daily variations for GPP, 30% for RE and 39% for NEE. Global radiation was always the best predictor of these variations, but soil water content and temperature did also influence carbon fluxes and balance. Seasonally, Rg was the major controlling factor for GPP, RE and NEE during the wet season. During the dry season, variations in carbon fluxes and balance were poorly explained by climate factors. Yet, REW was the key driver of variations in NEE during the dry season. This study highlights that, over the long-term, carbon fluxes and balance in such tropical rainforest ecosystems are largely controlled by both radiation and water limitation. Even though variations in Rg have a greater impact on these fluxes, water limitation during seasonal droughts is enough to reduce ecosystem productivity, respiration and carbon uptake. The reduced precipitation expected in tropical rainforest areas under future climatic conditions will therefore strongly influence carbon fluxes and carbon uptake. This study also highlights the importance for land surface or dynamic global vegetation models to consider the main drivers of carbon fluxes and balance separately for dry and wet seasons.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0168-1923 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Serial 792  
Permanent link to this record
 

 
Author Fu, Z.; Gerken, T.; Bromley, G.; Araújo, A.; Bonal, D.; Burban, B.; Ficklin, D.; Fuentes, J.D.; Goulden, M.; Hirano, T.; Kosugi, Y.; Liddell, M.; Nicolini, G.; Niu, S.; Roupsard, O.; Stefani, P.; Mi, C.; Tofte, Z.; Xiao, J.; Valentini, R.; Wolf, S.; Stoy, P.C. url  doi
openurl 
  Title The surface-atmosphere exchange of carbon dioxide in tropical rainforests: Sensitivity to environmental drivers and flux measurement methodology Type Journal Article
  Year 2018 Publication (up) Agricultural and Forest Meteorology Abbreviated Journal Agric. For. Meterol.  
  Volume 263 Issue Pages 292-307  
  Keywords Climate variability; Ecosystem respiration; Eddy covariance; Gross primary productivity; Net ecosystem carbon dioxide exchange; Tropical rainforest; acclimation; air temperature; anthropogenic effect; atmosphere-biosphere interaction; biodiversity; carbon flux; climate change; Cmip; eddy covariance; environmental change; flux measurement; methodology; net ecosystem exchange; net ecosystem production; radiative forcing; rainforest; sensitivity analysis; tropical environment  
  Abstract Tropical rainforests play a central role in the Earth system by regulating climate, maintaining biodiversity, and sequestering carbon. They are under threat by direct anthropogenic impacts like deforestation and the indirect anthropogenic impacts of climate change. A synthesis of the factors that determine the net ecosystem exchange of carbon dioxide (NEE) at the site scale across different forests in the tropical rainforest biome has not been undertaken to date. Here, we study NEE and its components, gross ecosystem productivity (GEP) and ecosystem respiration (RE), across thirteen natural and managed forests within the tropical rainforest biome with 63 total site-years of eddy covariance data. Our results reveal that the five ecosystems with the largest annual gross carbon uptake by photosynthesis (i.e. GEP > 3000 g C m−2 y-1) have the lowest net carbon uptake – or even carbon losses – versus other study ecosystems because RE is of a similar magnitude. Sites that provided subcanopy CO2 storage observations had higher average magnitudes of GEP and RE and lower average magnitudes of NEE, highlighting the importance of measurement methodology for understanding carbon dynamics in ecosystems with characteristically tall and dense vegetation. A path analysis revealed that vapor pressure deficit (VPD) played a greater role than soil moisture or air temperature in constraining GEP under light saturated conditions across most study sites, but to differing degrees from -0.31 to -0.87 μmol CO2 m−2 s-1 hPa-1. Climate projections from 13 general circulation models (CMIP5) under the representative concentration pathway that generates 8.5 W m−2 of radiative forcing suggest that many current tropical rainforest sites on the lower end of the current temperature range are likely to reach a climate space similar to present-day warmer sites by the year 2050, warmer sites will reach a climate not currently experienced, and all forests are likely to experience higher VPD. Results demonstrate the need to quantify if and how mature tropical trees acclimate to heat and water stress, and to further develop flux-partitioning and gap-filling algorithms for defensible estimates of carbon exchange in tropical rainforests. © 2018 Elsevier B.V.  
  Address Department of Environmental Systems Science, ETH Zurich, Zurich, 8092, Switzerland  
  Corporate Author Thesis  
  Publisher Elsevier B.V. Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 01681923 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 12 November 2018; Coden: Afmee; Correspondence Address: Stoy, P.C.; Department of Land Resources and Environmental Sciences, Montana State UniversityUnited States; email: paul.stoy@montana.edu; Funding details: ANR-10-LABX-25-01; Funding details: U.S. Department of Energy, DOE, SC0011097; Funding details: Agence Nationale de la Recherche, ANR; Funding details: 1702029; Funding details: 1552976; Funding details: Graduate School, Ohio State University; Funding details: National Natural Science Foundation of China, NSFC, 31625006; Funding text 1: PCS and JDF acknowledges funding support from the U.S. Department of Energy as part of the GoAmazon project (Grant SC0011097 ). PCS additionally acknowledges the U.S. National Science Foundation grants 1552976 and 1702029 , and The Graduate School at Montana State University . ZF is supported by the China Scholarship Council and National Natural Science Foundation of China ( 31625006 ). This work used eddy covariance data acquired and shared by the FLUXNET community, including the AmeriFlux, AfriFlux, AsiaFlux, CarboAfrica, LBA, and TERN- OzFlux networks. The FLUXNET eddy covariance data processing and harmonization was carried out by the ICOS Ecosystem Thematic Center, AmeriFlux Management Project and Fluxdata project of FLUXNET, with the support of CDIAC, and the OzFlux, ChinaFlux and AsiaFlux offices. The Guyaflux program belongs to the SOERE F-ORE-T which is supported annually by Ecofor, Allenvi and the French national research infrastructure ANAEE-F. The Guyaflux program also received support from the “Observatoire du Carbone en Guyane” and an “investissement d'avenir” grant from the Agence Nationale de la Recherche (CEBA, ref ANR-10-LABX-25-01). Funding for the site PA-SPn was provided by the North-South Centre of ETH Zurich. We acknowledge the World Climate Research Programme's Working Group on Coupled Modeling for the CMIP and thank the climate modeling groups for producing and making available their model output. For CMIP, the U.S. Department of Energy's Program for Climate Model Diagnosis and Intercomparison provides coordinating support and led development of software infrastructure in partnership with the Global Organization for Earth System Science Portals. Angela Tang and Taylor Rodenburg provided valuable comments to earlier drafts of this manuscript. We thank Dr. Tim Hill and two anonymous reviewers for their constructive comments on the manuscript.; References: Acevedo, O.C., Moraes, O.L.L., Degrazia, G.A., Fitzjarrald, D.R., Manzi, A.O., Campos, J.G., Is friction velocity the most appropriate scale for correcting nocturnal carbon dioxide fluxes? (2009) Agric. For. Meteorol., 149, pp. 1-10; Aguilos, M., Hérault, B., Burban, B., Wagner, F., Bonal, D., What drives long-term variations in carbon flux and balance in a tropical rainforest in French Guiana? Agric (2018) For. Meteorol., 253-254, pp. 114-123; Ahlström, A., Raupach, M.R., Schurgers, G., Smith, B., Arneth, A., Jung, M., Reichstein, M., Jain, A.K., The dominant role of semi-arid ecosystems in the trend and variability of the land CO2 sink (2015) Science, 348 (80), pp. 895-899; Aiba, S.I., Kitayama, K., Structure, composition and species diversity in an altitude-substrate matrix of rain forest tree communities on Mount Kinabalu (1999) Borneo. Plant Ecol., 140, pp. 139-157; Andreae, M.O., Artaxo, P., Brandão, C., Carswell, F.E., Ciccioli, P., da Costa, A.L., Culf, A.D., Waterloo, M.J., Biogeochemical cycling of carbon, water, energy, trace gases, and aerosols in Amazonia: the LBA-EUSTACH experiments (2002) J. Geophys. Res., 107, p. 8066; Andreae, M.O., Acevedo, O.C., Araùjo, A., Artaxo, P., Barbosa, C.G.G., Barbosa, H.M.J., Brito, J., Yáñez-Serrano, A.M., The Amazon Tall Tower Observatory (ATTO): overview of pilot measurements on ecosystem ecology, meteorology, trace gases, and aerosols (2015) Atmos. Chem. Phys., 15, pp. 10723-10776; Araújo, A.C., Nobre, A.D., Kruijt, B., Elbers, J.A., Dallarosa, R., Stefani, P., Von Randow, C., Kabat, P., Comparative measurements of carbon dioxide fluxes from two nearby towers in a central Amazonian rainforest: The Manaus LBA site (2002) J. Geophys. Res., 107, p. 8090; Asner, G.P., Anderson, C.B., Martin, R.E., Tupayachi, R., Knapp, D.E., Sinca, F., Landscape biogeochemistry reflected in shifting distributions of chemical traits in the Amazon forest canopy (2015) Nat. Geosci., 8, pp. 567-573; Asner, G.P., Martin, R.E., Knapp, D.E., Tupayachi, R., Anderson, C.B., Sinca, F., Vaughn, N.R., Llactayo, W., Airborne laser-guided imaging spectroscopy to map forest trait diversity and guide conservation (2017) Science, 355 (80), pp. 385-389; Avissar, R., Werth, D., Global hydroclimatological teleconnections resulting from tropical deforestation (2005) J. Hydrometeorol., 6, pp. 134-145; Baccini, A., Walker, W., Carvalho, L., Farina, M., Sulla-Menashe, D., Houghton, R.A., Tropical forests are a net carbon source based on aboveground measurements of gain and loss (2017) Science, 358 (80), pp. 230-234; Belelli Marchesini, L., Bombelli, A., Chiti, T., Consalvo, C., Forgione, A., Grieco, E., Mazzenga, F., Valentini, R., Ankasa flux tower: a new research facility for the study of the carbon cycle in a primary tropical forest in Africa (2008) Proceedings of the Open Science Conference on Africa and Carbon Cycle: The CarboAfrica Project; Beringer, J., Hutley, L.B., McHugh, I., Arndt, S.K., Campbell, D., Cleugh, H.A., Cleverly, J., Wardlaw, T., An introduction to the Australian and New Zealand flux tower network – OzFlux (2016) Biogeosciences, 13, pp. 5895-5916; Bonal, D., Bosc, A., Ponton, S., Goret, J.-Y.J.Y., Burban, B.T., Gross, P., Bonnefond, J.M.J.-M., Granier, A., Impact of severe dry season on net ecosystem exchange in the Neotropical rainforest of French Guiana (2008) Glob. Chang. Biol., 14, pp. 1917-1933; Borma, L.S., da Rocha, H.R., Cabral, O.M., von Randow, C., Collicchio, E., Kurzatkowski, D., Brugger, P.J., Artaxo, P., Atmosphere and hydrological controls of the evapotranspiration over a floodplain forest in the Bananal Island region, Amazonia (2009) J. Geophys. Res. Biogeosci., 114; Bradford, M.G., Metcalfe, D.J., Ford, A., Liddell, M.J., McKeown, A., Floristics, stand structure and aboveground biomass of a 25-ha rainforest plot in the Wet Tropics of Australia (2014) J. Trop. For. Sci., pp. 543-553; Braga, N., da, S., Vitória, A.P., Souza, G.M., Barros, C.F., Freitas, L., Weak relationships between leaf phenology and isohydric and anisohydric behavior in lowland wet tropical forest trees (2016) Biotropica, 48, pp. 453-464; Carswell, F.E., Costa, A.L., Palheta, M., Malhi, Y., Meir, P., Costa, J.D.P.R., Ruivo, M.D.L., Grace, J., Seasonality in CO2 and H2O flux at an eastern Amazonian rain forest (2002) J. Geophys. Res. D Atmos., p. 107; Chambers, J.Q., Tribuzy, E.S., Toledo, L.C., Crispim, B.F., Higuchi, N., dos Santos, J., Araújo, A.C., Trumbore, S.E., Respiration from a tropical forest ecosystem: partitioning of sources and low carbon use efficiency (2004) Ecol. Appl., 14, pp. 72-88; Chambers, J., Davies, S., Koven, C., Kueppers, L., Leung, R., McDowell, N., Norby, R., Rogers, A., Next Generation Ecosystem Experiment (NGEE) Tropics. US DOE NGEE Trop. white paper. (2014); Chiti, T., Certini, G., Grieco, E., Valentini, R., The role of soil in storing carbon in tropical rainforests: the case of Ankasa Park, Ghana (2010) Plant Soil, 331, pp. 453-461; Cleveland, C.C., Wieder, W.R., Reed, S.C., Townsend, A.R., Experimental drought in a tropical rain forest increases soil carbon dioxide losses to the atmosphere (2010) Ecology, 91, pp. 2313-2323; Cleveland, C.C., Townsend, A.R., Taylor, P., Alvarez-Clare, S., Bustamante, M.M.C., Chuyong, G., Dobrowski, S.Z., Wieder, W.R., Relationships among net primary productivity, nutrients and climate in tropical rain forest: a pan-tropical analysis (2011) Ecol. Lett.; Cusack, D.F., Chou, W.W., Yang, W.H., Harmon, M.E., Silver, W.L., Controls on long-term root and leaf litter decomposition in neotropical forests (2009) Glob. Chang. Biol., 15, pp. 1339-1355; da Rocha, H.R., Manzi, A.O., Cabral, O.M., Miller, S.D., Goulden, M.L., Saleska, S.R., Coupe, N.R., Maia, J.F., Patterns of water and heat flux across a biome gradient from tropical forest to savanna in Brazil (2009) J. Geophys. Res. Biogeosci., 114. , G00B12; Dargie, G.C., Lewis, S.L., Lawson, I.T., Mitchard, E.T.A., Page, S.E., Bocko, Y.E., Ifo, S.A., Age, extent and carbon storage of the central Congo Basin peatland complex (2017) Nature, 542, pp. 86-89; de Araújo, A.C., Dolman, A.J., Waterloo, M.J., Gash, J.H.C., Kruijt, B., Zanchi, F.B., de Lange, J.M.E., Backer, J., The spatial variability of CO2 storage and the interpretation of eddy covariance fluxes in central Amazonia (2010) Agric. For. Meteorol., 150, pp. 226-237; Dixon, R.K., Solomon, A.M., Brown, S., Houghton, R.A., Trexier, M.C., Wisniewski, J., Carbon pools and flux of global forest ecosystems (1994) Science, 263 (80), pp. 185-190; Fisher, R.A., Williams, M., Do Vale, R.L., Da Costa, A.L., Meir, P., Evidence from Amazonian forests is consistent with isohydric control of leaf water potential (2006) Plant Cell Environ., 29, pp. 151-165; Foley, J.A., DeFries, R., Asner, G.P., Barford, C., Bonan, G., Carpenter, S.R., Chapin, F.S., Snyder, P.K., Global consequences of land use (2005) Science, 309, pp. 570-574; Fu, Z., Dong, J., Zhou, Y., Stoy, P.C., Niu, S., Long term trend and interannual variability of land carbon uptake—the attribution and processes (2017) Environ. Res. Lett., 12, p. 14018; Fuentes, J.D., Chamecki, M., dos Santos, R.M.N., Von Randow, C., Stoy, P.C., Katul, G., Fitzjarrald, D., Yañez-Serrano, A.M., Linking meteorology, turbulence, and air chemistry in the amazon rain forest (2016) Bull. Am. Meteorol. Soc., 97, pp. 2329-2342; Gerken, T., Chamecki, M., Fuentes, J.D., Air-parcel residence times within forest canopies (2017) Boundary-Layer Meteorol., 165, pp. 29-54; Giardina, F., Konings, A.G., Kennedy, D., Alemohammad, S.H., Oliveira, R.S., Uriarte, M., Gentine, P., Tall Amazonian forests are less sensitive to precipitation variability (2018) Nat. Geosci., 11, pp. 405-409; Gibson, L., Lee, T.M., Koh, L.P., Brook, B.W., Gardner, T.A., Barlow, J., Peres, C.A., Sodhi, N.S., Primary forests are irreplaceable for sustaining tropical biodiversity (2011) Nature, 478, pp. 378-381; Goulden, M.L., Miller, S.D., Da Rocha, H.R., Nocturnal cold air drainage and pooling in a tropical forest (2006) J. Geophys. Res. Atmos., p. 111; Grace, J., Lloyd, J., Mcintyre, J., Miranda, A., Meir, P., Miranda, H., Moncrieff, J., Gash, J., Fluxes of carbon dioxide and water vapour over an undisturbed tropical forest in south-west Amazonia (1995) Glob. Chang. Biol., 1, pp. 1-12; Grace, J., Malhi, Y., Lloyd, J., McIntyre, J., Miranda, A.C., Meir, P., Miranda, H.S., The use of eddy covariance to infer the net carbon dioxide uptake of Brazilian rain forest (1996) Glob. Chang. Biol., 2, pp. 209-217; Grace, J., Nagy, L., Forsberg, B.R., Artaxo, P., The Amazon carbon balance: an evaluation of methods and results (2016) Interactions Between Biosphere, Atmosphere and Human Land Use in the Amazon Basin., pp. 79-100. , Springer Berlin Heidelberg; Hall, C.A.S., Tian, H., Qi, Y., Pontius, G., Cornell, J., Modelling spatial and temporal patterns of tropical land use change (1995) J. Biogeogr., 22, pp. 753-757; Hayek, M.N., Wehr, R., Longo, M., Hutyra, L.R., Wiedemann, K., Munger, J.W., Bonal, D., Wofsy, S.C., A novel correction for biases in forest eddy covariance carbon balance (2018) Agric. For. Meteorol., 250-251, pp. 90-101; Hirano, T., Segah, H., Harada, T., Limin, S., June, T., Hirata, R., Osaki, M., Carbon dioxide balance of a tropical peat swamp forest in Kalimantan, Indonesia (2007) Glob. Chang. Biol., 13, pp. 412-425; Hirano, T., Jauhiainen, J., Inoue, T., Takahashi, H., Controls on the carbon balance of tropical peatlands (2008) Ecosystems, 12, pp. 873-887; Hirano, T., Segah, H., Kusin, K., Limin, S., Takahashi, H., Osaki, M., Effects of disturbances on the carbon balance of tropical peat swamp forests (2012) Glob. Change Biol., 18, pp. 3410-3422; Huete, A.R., Didan, K., Shimabukuro, Y.E., Ratana, P., Saleska, S.R., Hutyra, L.R., Yang, W., Myneni, R., Amazon rainforests green‐up with sunlight in dry season (2006) Geophys. Res. Lett., 33. , L06405; Huete, A.R., Restrepo-Coupe, N., Ratana, P., Didan, K., Saleska, S.R., Ichii, K., Panuthai, S., Gamo, M., Multiple site tower flux and remote sensing comparisons of tropical forest dynamics in Monsoon Asia (2008) Agric. For. Meteorol., 148, pp. 748-760; Hutyra, L.R., Munger, J.W., Saleska, S.R., Gottlieb, E., Daube, B.C., Dunn, A.L., Amaral, D.F., Wofsy, S.C., Seasonal controls on the exchange of carbon and water in an Amazonian rain forest (2007) J. Geophys. Res. Biogeosci., 112; Hutyra, L.R., Munger, J.W., Hammond-Pyle, E., Saleska, S.R., Restrepo-Coupe, N., Daube, B.C., de Camargo, P.B., Wofsy, S.C., Resolving systematic errors in estimates of net ecosystem exchange of CO2 and ecosystem respiration in a tropical forest biome (2008) Agric. For. Meteorol., 148, pp. 1266-1279; Inoue, Y., Ichie, T., Kenzo, T., Yoneyama, A., Kumagai, T., Nakashizuka, T., Effects of rainfall exclusion on leaf gas exchange traits and osmotic adjustment in mature canpopy trees of Dryobalanops aromatica (Sipterocarpaceae) in a Malaysian tropical rain forest (2016) J. Trop. Pediatr., pp. 1-11; Jocher, G., Ottosson Löfvenius, M., De Simon, G., Hörnlund, T., Linder, S., Lundmark, T., Marshall, J., Peichl, M., Apparent winter CO2 uptake by a boreal forest due to decoupling (2017) Agric. For. Meteorol., 232, pp. 23-34; Kiew, F., Hirata, R., Hirano, T., Wong, G.X., Aeries, E.B., Musin, K.K., Waili, J.W., Melling, L., CO2 balance of a secondary tropical peat swamp forest in Sarawak, Malaysia (2018) Agric. For. Meteorol., 248, pp. 494-501; Kim, D.-H., Sexton, J.O., Townshend, J.R., Accelerated deforestation in the humid tropics from the 1990s to the 2000s (2015) Geophys. Res. Lett., 42, pp. 3495-3501; Klein, T., The variability of stomatal sensitivity to leaf water potential across tree species indicates a continuum between isohydric and anisohydric behaviours (2014) Funct. Ecol., 28, pp. 1313-1320; Konings, A.G., Gentine, P., Global variations in ecosystem‐scale isohydricity (2016) Glob. Change Biol.; Körner, C., Leaf diffusive conductances in the major vegetation types of the globe (1995) Ecophysiology of Photosynthesis, pp. 463-490. , Springer; Kosugi, Y., Takanashi, S., Ohkubo, S., Matsuo, N., Tani, M., Mitani, T., Tsutsumi, D., Nik, A.R., CO2 exchange of a tropical rainforest at Pasoh in Peninsular Malaysia (2008) Agric. For. Meteorol., 148, pp. 439-452; Kosugi, Y., Takanashi, S., Tani, M., Ohkubo, S., Matsuo, N., Itoh, M., Noguchi, S., Nik, A.R., Effect of inter-annual climate variability on evapotranspiration and canopy CO2 exchange of a tropical rainforest in Peninsular Malaysia (2012) J. For. Res., 17, pp. 227-240; Kruijt, B., Elbers, J.A., Von Randow, C., Araujo, A.C., Oliveira, P.J., Culf, A., Manzi, A.O., Moors, E.J., The robustness of eddy correlation fluxes for Amazon rain forest conditions (2004) Ecol. Appl., 14, pp. 101-113; Kumagai, T., Porporato, A., Strategies of a Bornean tropical rainforest water use as a function of rainfall regime: isohydric or anisohydric? (2012) Plant Cell Environ., 35, pp. 61-71; Kutsch, W.L., Herbst, M., Vanselow, R., Hummelshøj, P., Jensen, N.O., Kappen, L., Stomatal acclimation influences water and carbon fluxes of a beech canopy in northern Germany (2001) Basic Appl. Ecol., 2, pp. 265-281; Lasslop, G., Reichstein, M., Papale, D., Richardson, A.D., Arneth, A., Barr, A.G., Stoy, P.C., Wohlfahrt, G., Separation of net ecosystem exchange into assimilation and respiration using a light response curve approach: critical issues and global evaluation (2010) Glob. Chang. Biol., 16, pp. 187-208; Levine, N.M., Zhang, K., Longo, M., Baccini, A., Phillips, O.L., Lewis, S.L., Alvarez-Dávila, E., Moorcroft, P.R., Ecosystem heterogeneity determines the ecological resilience of the Amazon to climate change (2016) Proc. Natl. Acad. Sci., 113, pp. 793-797; Lewis, S.L., Brando, P.M., Phillips, O.L., van der Heijden, G.M.F., Nepstad, D., The 2010 amazon drought (2011) Science, 331 (80), p. 554; Loescher, H.W., Oberbauer, S.F., Gholz, H.L., Clark, D.B., Environmental controls on net ecosystem-level carbon exchange and productivity in a Central American tropical wet forest (2003) Glob. Chang. Biol., 9, p. 396; Lopes, A.P., Nelson, B.W., Wu, J., Graça, P.M.L., de, A., Tavares, J.V., Prohaska, N., Saleska, S.R., Leaf flush drives dry season green-up of the Central Amazon (2016) Remote Sens. Environ., 182, pp. 90-98; Malhi, Y., Nobre, A.D., Grace, J., Kruijt, B., Pereira, M.G.P., Culf, A., Scott, S., Carbon dioxide transfer over a Central Amazonian rain forest (1998) J. Geophys. Res., 103, pp. 31593-31612; Marchin, R.M., Broadhead, A.A., Bostic, L.E., Dunn, R.R., Hoffmann, W.A., Stomatal acclimation to vapour pressure deficit doubles transpiration of small tree seedlings with warming (2016) Plant Cell Environ., 39, pp. 2221-2234; Martens, C.S., Shay, T.J., Mendlovitz, H.P., Matross, D.M., Saleska, S.R., Wofsy, S.C., Stephen Woodward, W., Crill, P.M., Radon fluxes in tropical forest ecosystems of Brazilian Amazonia: night‐time CO2 net ecosystem exchange derived from radon and eddy covariance methods (2004) Glob. Chang. Biol., 10, pp. 618-629; Martinez-Vilalta, J., Poyatos, R., Aguade, D., Retana, J., Mencuccini, M., A new look at water transport regulation in plants (2014) New Phytol., 204, pp. 105-115; Matheny, A.M., Mirfenderesgi, G., Bohrer, G., Trait-based representation of hydrological functional properties of plants in weather and ecosystem models (2017) Plant Divers., 39, pp. 1-12; Meir, P., Grace, J., Miranda, A.C., Leaf respiration in two tropical rainforests: constraints on physiology by phosphorus, nitrogen and temperature (2001) Funct. Ecol., 15, pp. 378-387; Miller, S.D., Goulden, M.L., Menton, M.C., da Rocha, H.R., de Freitas, H.C., Silva, E., Figueira, A.M., de Sousa, C.A.D., Biometric and micrometeorological measurements of tropical forest carbon balance (2004) Ecol. Appl., 14, pp. 114-126; Mitchard, E.T.A., The tropical forest carbon cycle and climate change (2018) Nature, 559, pp. 527-534; Navarro, M.N.V., Jourdan, C., Sileye, T., Braconnier, S., Mialet-Serra, I., Saint-Andre, L., Dauzat, J., Roupsard, O., Fruit development, not GPP, drives seasonal variation in NPP in a tropical palm plantation (2008) Tree Physiol., 28, pp. 1661-1674; Nepstad, D.C., Moutinho, P., Dias‐Filho, M.B., Davidson, E., Cardinot, G., Markewitz, D., Figueiredo, R., Schwalbe, K., The effects of partial throughfall exclusion on canopy processes, aboveground production, and biogeochemistry of an Amazon forest (2002) J. Geophys. Res., 107. , 8085; Norby, R.J., De Kauwe, M.G., Domingues, T.F., Duursma, R.A., Ellsworth, D.S., Goll, D.S., Lapola, D.M., Zaehle, S., Model – data synthesis for the next generation of forest free-air CO2 enrichment (FACE) experiments (2015) New Phytol., pp. 17-28; Novick, K., Oren, R., Stoy, P.C., Juang, J.Y., Siqueira, M., Katul, G., The relationship between reference canopy conductance and simplified hydraulic architecture (2009) Adv. Water Resour., 32, pp. 809-819; Novick, K.A., Ficklin, D.L., Stoy, P.C., Williams, C.A., Bohrer, G., Oishi, A.C., Papuga, S.A., Phillips, R.P., The increasing importance of atmospheric demand for ecosystem water and carbon fluxes (2016) Nat. Clim. Change, 6, pp. 1023-1027; Oberbauer, S.F., Loescher, H.W., Clark, D.B., Effects of climate factors on daytime carbon exchange from an old growth forest in Costa rica (2000) Selbyana, pp. 66-73; Oren, R., Sperry, J.S., Katul, G.G., Pataki, D.E., Ewers, B.E., Phillips, N., Schäfer, K.V.R., Survey and synthesis of intra- and interspecific variation in stomatal sensitivity to vapour pressure deficit (1999) Plant Cell Environ., 22, pp. 1515-1526; Pan, Y., Birdsey, R.A., Fang, J., Houghton, R., Kauppi, P.E., Kurz, W.A., Phillips, O.L., Hayes, D., A large and persistent carbon sink in the world's forests (2011) Science, 333 (80). , 988 LP-993; Paoli, G.D., Curran, L.M., Slik, J.W.F., Soil nutrients affect spatial patterns of aboveground biomass and emergent tree density in southwestern Borneo (2008) Oecologia, 155, pp. 287-299; Papale, D., Reichstein, M., Aubinet, M., Canfora, E., Bernhofer, C., Kutsch, W., Longdoz, B., Yakir, D., Towards a standardized processing of Net Ecosystem Exchange measured with eddy covariance technique: algorithms and uncertainty estimation (2006) Biogeosciences, 3, pp. 571-583; Pau, S., Detto, M., Kim, Y., Still, C.J., Tropical forest temperature thresholds for gross primary productivity (2018) Ecosphere, 9; Pavlick, R., Drewry, D.T., Bohn, K., Reu, B., Kleidon, A., The Jena Diversity-Dynamic Global Vegetation Model (JeDi-DGVM): a diverse approach to representing terrestrial biogeography and biogeochemistry based on plant functional trade-offs (2013) Biogeosciences, 10, pp. 4137-4177; Phillips, O.L., Malhi, Y., Higuchi, N., Laurance, W.F., Núñez, P.V., Vásquez, R.M., Laurance, S.G., Grace, J., Changes in the carbon balance of tropical forests: Evidence from long-term plots (1998) Science, 282 (80). , 439 LP-442; Phillips, O.L., Aragão, L.E.O.C., Lewis, S.L., Fisher, J.B., Lloyd, J., López-González, G., Malhi, Y., Torres-Lezama, A., Drought sensitivity of the Amazon Rainforest (2009) Science, 323 (80), pp. 1344-1347; Powell, T.L., Wheeler, J.K., de Oliveira, A.A.R., da Costa, A.C.L., Saleska, S.R., Meir, P., Moorcroft, P.R., Differences in xylem and leaf hydraulic traits explain differences in drought tolerance among mature Amazon rainforest trees (2017) Glob. Change Biol.; Raich, J.W., Russell, A.E., Vitousek, P.M., Primary productivity and ecosystem development along an elevational gradient on Mauna Loa, Hawai'i (1997) Ecology, 78, pp. 707-721; Reichstein, M., Falge, E., Baldocchi, D., Papale, D., Aubinet, M., Berbigier, P., Bernhofer, C., Valentini, R., On the separation of net ecosystem exchange into assimilation and ecosystem respiration: review and improved algorithm (2005) Glob. Change Biol., 11, pp. 1424-1439; Restrepo-Coupe, N., da Rocha, H.R., Hutyra, L.R., da Araujo, A.C., Borma, L.S., Christoffersen, B., Cabral, O.M.R., Saleska, S.R., What drives the seasonality of photosynthesis across the Amazon basin? A cross-site analysis of eddy flux tower measurements from the Brasil flux network (2013) Agric. For. Meteorol.; Rice, W.R., Analyzing tables of statistical tests (1989) Evolution (N. Y.), 43, pp. 223-225; Richardson, A.D., Braswell, B.H., Hollinger, D.Y., Jenkins, J.P., Ollinger, S.V., Near-surface remote sensing of spatial and temporal variation in canopy phenology (2009) Ecol. Appl., 19, pp. 1417-1428; Roderick, M.L., Farquhar, G.D., The cause of decreased Pan evaporation over the past 50 years (2002) Science, 298 (80), pp. 1410-1411; Roupsard, O., Bonnefond, J.-M., Irvine, M., Berbigier, P., Nouvellon, Y., Dauzat, J., Taga, S., Bouillet, J.-P., Partitioning energy and evapo-transpiration above and below a tropical palm canopy (2006) Agric. For. Meteorol., 139, pp. 252-268; Saleska, S.R., Miller, S.D., Matross, D.M., Goulden, M., Wofsy, S., da Rocha, H.R., de Camargo, P.B., Silva, H., Carbon in Amazon forests: unexpected seasonal fluxes and disturbance-induced losses (2003) Science, 302 (80), pp. 1554-1557; Saleska, S.R., Didan, K., Huete, A.R., Da Rocha, H.R., Amazon forests green-up during 2005 drought (2007) Science, 318 (80), p. 612; Saleska, S., Da Rocha, H., Kruijt, B., Nobre, A., Ecosystem carbon fluxes and Amazonian forest metabolism (2009) Amazonia Glob. Change, pp. 389-407; Saleska, S.R., Wu, J., Guan, K., Araujo, A.C., Huete, A., Nobre, A.D., Restrepo-Coupe, N., Dry-season greening of Amazon forests (2016) Nature, 531, pp. E4-E5; Salinas, N., Malhi, Y., Meir, P., Silman, M., Roman Cuesta, R., Huaman, J., Salinas, D., Farfan, F., The sensitivity of tropical leaf litter decomposition to temperature: results from a large-scale leaf translocation experiment along an elevation gradient in Peruvian forests (2011) New Phytol., 189, pp. 967-977; Santana, R.A., Dias-Júnior, C.Q., da Silva, J.T., Fuentes, J.D., do Vale, R.S., Alves, E.G., dos Santos, R.M.N., Manzi, A.O., Air turbulence characteristics at multiple sites in and above the Amazon rainforest canopy (2018) Agric. For. Meteorol., 260-261, pp. 41-54; Santos, D.M., Acevedo, O.C., Chamecki, M., Fuentes, J.D., Gerken, T., Stoy, P.C., Temporal scales of the nocturnal flow within and above a forest canopy in Amazonia (2016) Boundary-Layer Meteorol., pp. 1-26; Siddiq, Z., Chen, Y.-J., Zhang, Y.-J., Zhang, J.-L., Cao, K.-F., More sensitive response of crown conductance to VPD and larger water consumption in tropical evergreen than in deciduous broadleaf timber trees (2017) Agric. For. Meteorol., 247, pp. 399-407; Sulman, B.N., Roman, D.T., Yi, K., Wang, L., Phillips, R.P., Novick, K.A., High atmospheric demand for water can limit forest carbon uptake and transpiration as severely as dry soil (2016) Geophys. Res. Lett., 43, pp. 9686-9695; Swann, A.L.S., Hoffman, F.M., Koven, C.D., Randerson, J.T., Plant responses to increasing CO2 reduce estimates of climate impacts on drought severity (2016) Proc. Natl. Acad. Sci. U. S. A., 113, pp. 10019-10024; Taylor, K.E., Stouffer, R.J., Meehl, G.A., An overview of CMIP5 and the experiment design (2012) Bull. Am. Meteorol. Soc.; Taylor, P.G., Cleveland, C.C., Wieder, W.R., Sullivan, B.W., Doughty, C.E., Dobrowski, S.Z., Townsend, A.R., Temperature and rainfall interact to control carbon cycling in tropical forests (2017) Ecol. Lett., 20, pp. 779-788; Thomas, C.K., Martin, J.G., Law, B.E., Davis, K., Toward biologically meaningful net carbon exchange estimates for tall, dense canopies: multi-level eddy covariance observations and canopy coupling regimes in a mature Douglas-fir forest in Oregon (2013) Agric. For. Meteorol., 173, pp. 14-27; Tóta, J., Fitzjarrald, D.R., da Silva Dias, M.A.F., Amazon rainforest exchange of carbon and subcanopy air flow: manaus LBA Site—a complex terrain condition (2012) Transfus. Apher. Sci., , 165067; Tyukavina, A., Baccini, A., Hansen, M.C., Potapov, P.V., Stehman, S.V., Houghton, R.A., Krylov, A.M., Goetz, S.J., Aboveground carbon loss in natural and managed tropical forests from 2000 to 2012 (2015) Environ. Res. Lett., 10, p. 74002; van Marle, M.J.E., Field, R.D., van der Werf, G.R., Estrada de Wagt, I.A., Houghton, R.A., Rizzo, L.V., Artaxo, P., Tsigaridis, K., Fire and deforestation dynamics in Amazonia (1973-2014) (2017) Glob. Biogeochem. Cycles, 31, pp. 24-38; Wieder, W.R., Cleveland, C.C., Townsend, A.R., Controls over leaf litter decomposition in wet tropical forests (2009) Ecology, 90, pp. 3333-3341; Wolf, S., Eugster, W., Majorek, S., Buchmann, N., Afforestation of tropical pasture only marginally affects ecosystem-scale evapotranspiration (2011) Ecosystems, 14, pp. 1264-1275; Wolf, S., Eugster, W., Potvin, C., Buchmann, N., Strong seasonal variations in net ecosystem CO2 exchange of a tropical pasture and afforestation in Panama (2011) Agric. For. Meteorol., 151, pp. 1139-1151; Wolf, S., Eugster, W., Potvin, C., Turner, B.L., Buchmann, N., Carbon sequestration potential of tropical pasture compared with afforestation in Panama (2011) Glob. Change Biol., 17, pp. 2763-2780; Wood, A.W., Leung, L.R., Sridhar, V., Lettenmaier, D.P., Hydrologic implications of dynamical and statistical approaches to downscaling climate model outputs (2004) Clim. Change, 62, pp. 189-216; Wu, J., Guan, K., Hayek, M., Restrepo-Coupe, N., Wiedemann, K.T., Xu, X., Wehr, R., Saleska, S.R., Partitioning controls on Amazon forest photosynthesis between environmental and biotic factors at hourly to interannual timescales (2017) Glob. Change Biol., 23, pp. 1240-1257; Xiao, J., Liu, S., Stoy, P.C., Preface: impacts of extreme climate events and disturbances on carbon dynamics (2016) Biogeosciences, 13, pp. 3665-3675 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 831  
Permanent link to this record
 

 
Author Perrin, A.-S.; Fujisaki, K.; Petitjean, C.; Sarrazin, M.; Godet, M.; Garric, B.; Horth, J.-C.; Balbino, L.C.; Filho, A.S.; de Almeida Machado, P.L.O.; Brossard, M. url  doi
openurl 
  Title Conversion of forest to agriculture in Amazonia with the chop-and-mulch method: Does it improve the soil carbon stock? Type Journal Article
  Year 2014 Publication (up) Agriculture, Ecosystems and Environment Abbreviated Journal Agric. Ecosyst. Environ.  
  Volume 184 Issue Pages 101-114  
  Keywords Annual crops; Brachiaria; Deforestation; Fire-free; French Guiana; No-tillage  
  Abstract Fire-free forest conversion with organic inputs as an alternative to slash-and-burn could improve agro-ecosystem sustainability. We assessed soil carbon mass changes in a sandy-clayey and well-drained soil in French Guiana after forest clearing by the chop-and-mulch method and crop establishment. At the experimental site of Combi, native forest was cut down in October 2008; woody biomass was chopped and incorporated into the top 20cm of soil. After about one year of legume and grass cover, three forms of land management were compared: grassland (Urochloa ruziziensis), maize/soybean crop rotation with disk tillage and in direct seeding without tillage. There were four replicates. We measured 14.16kgm-2 of carbon in 2mm-sieved soil down to 2m depth for the initial forest. Forest clearing did not induce significant soil compaction; neither did any specific agricultural practice. In converted soils, C stocks were measured in the 0-30cm layer after each crop for three years. Carbon mass changes for soil fractions <2mm (soil C stock) and >2mm (soil C pool) in the 0-5, 5-10, 10-20 and 20-30cm soil layers were assessed on an equivalent soil mass basis. One year and 1.5 years after deforestation, higher C stocks (+0.64 to 1.16kgCm-2yr-1) and C pools (+0.52 to 0.90kgCm-2yr-1) were measured in converted soils, compared to those of the forest into the top 30cm of soil. However, the masses of carbon in these converted soils declined later. The highest rates of carbon decrease were measured between 1.5 and 2 years after forest conversion in the <2mm soil fraction, from 0.46kgCm-2yr-1 (in grassland soils) to 0.71kgCm-2yr-1 (in cropland under no tillage). The carbon pool declined during the third year at rates of 0.41kgCm-2yr-1 (cropland under disk tillage) to 0.76kgCm-2yr-1 (grassland soils). Three years after forest conversion, C masses in the top 30cm of soils for grassland showed similar values than for forest. In comparison, the carbon stock in cropped soils managed under no tillage in direct seeding (without mulch) was significantly 17% and 16% lower than in forest and grassland soils, respectively. None of the studied agricultural practices succeeded in accumulating carbon from the chopped forest biomass. © 2013 Elsevier B.V.  
  Address EMBRAPA Arroz e Feijao, Cx Postal 179, CEP 75375-000 Santo Antonio de Goias, GO, Brazil  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 01678809 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 2 January 2014; Source: Scopus; Coden: Aeend; doi: 10.1016/j.agee.2013.11.009 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 521  
Permanent link to this record
 

 
Author Petitjean, C.; Hénault, C.; Perrin, A.-S.; Pontet, C.; Metay, A.; Bernoux, M.; Jehanno, T.; Viard, A.; Roggy, J.-C. doi  openurl
  Title Soil N2O emissions in French Guiana after the conversion of tropical forest to agriculture with the chop-and-mulch method Type Journal Article
  Year 2015 Publication (up) Agriculture, Ecosystems and Environment Abbreviated Journal Agriculture, Ecosystems and Environment  
  Volume 208 Issue Pages 64-74  
  Keywords Chop-and-mulch method; Fire-free deforestation; French Guiana; Land use change; Soil N<inf>2</inf>O emissions  
  Abstract In French Guiana, the population growth will result in an increase in demand for agricultural products and thus, will lead to an increase in the amount of tropical forests converted into cropland or pasture. Impacts of different agricultural systems on greenhouse gas (GHG) fluxes have not been studied in French Guiana. In this context, the fire-free chop-and-mulch method was used to convert a tropical forest site to agriculture. This study focused on soil nitrous oxide (N<inf>2</inf>O) emissions and we compared four land uses: (1) the undisturbed tropical forest, (2) recently converted grassland and recently converted croplands (fertilized soybean/maize rotation) with either (3) disk tillage or (4) no tillage.N<inf>2</inf>O measurements were obtained through the chamber technique and conducted over a 1-year period (measurements began 19 months after the forest was cleared). N<inf>2</inf>O fluxes were related to soil parameters measured at each sampling date: nitrate and ammonium contents, gravimetric water content (GWC) and temperature. Through the entire period, the mean (± standard error) and median N<inf>2</inf>O fluxes were 3.8 ± 0.5 and 2.7 gNha-1day-1, respectively for undisturbed tropical forest and 2.4 ± 0.9 and 0.8gNha-1day-1, respectively for grassland (mowed Brachiaria ruziziensis). For croplands, no significant difference was found for N<inf>2</inf>O emissions between both agricultural practices. The mean (± standard error) and median N<inf>2</inf>O fluxes were 8.5 ± 1.2 and 4.0 gNha-1day-1, respectively for disk tillage plots and 8.5 ± 1.3 and 3.6gNha-1day-1, respectively for no tillage plots. Nitrogen inputs (due to the application of fertilizer or due to the mineralization of crop residues) led to higher N<inf>2</inf>O fluxes, resulting in significantly higher mean N<inf>2</inf>O emissions from croplands compared to the forest, when only considering land use effect on N<inf>2</inf>O fluxes in a statistical model. The soil nitrate content, GWC and temperature had a significant positive effect on N<inf>2</inf>O fluxes. Taking into account these soil parameters in another statistical model, N<inf>2</inf>O emissions from croplands were not higher than the natural N<inf>2</inf>O emissions from tropical forest soils. Our results suggest that, if more forest will have to be converted in the course of the expected population growth in French Guiana, it could have low impact on the soil N<inf>2</inf>O fluxes (similar to natural fluxes from forest) with the improving of farming techniques (for example modification of the splitting of N-fertilizer) in the cropping plots. © 2015 Elsevier B.V.  
  Address INRA, UMR EcoFoG, Campus agronomiqueKourou, Guyane Française, France  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 18 May 2015 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 601  
Permanent link to this record
 

 
Author Leroy, C.; Sabatier, S.; Wahyuni, N.S.; Barczi, J.F.; Dauzat, J.; Laurans, M.; Auclair, D. openurl 
  Title Virtual trees and light capture: a method for optimizing agroforestry stand design Type Journal Article
  Year 2009 Publication (up) Agroforestry Systems Abbreviated Journal Agrofor. Syst.  
  Volume 77 Issue 1 Pages 37-47  
  Keywords Acacia mangium; Tectona grandis; Agroforestry; Light interception; Plant architecture; Simulation; 3D virtual plant  
  Abstract In agroforestry systems, the distribution of light transmitted under tree canopies can be a limiting factor for the development of intercrops. The light available for intercrops depends on the quantity of light intercepted by tree canopies and, consequently, on the architecture of the tree species present. The influence of tree architecture on light transmission was analysed using dynamic 3D architectural models. The architectural analysis of Acacia mangium and Tectona grandis was performed in Indonesian agroforestry systems with trees aged from 1 to 3 years. 3D virtual trees were then generated with the AmapSim simulation software and 3D virtual experiments in which tree age, planting density, planting pattern and pruning intensity varied were reconstructed in order to simulate light available for the crop. Canopy closure of trees was more rapid in A. mangium than in T. grandis agroforestry systems; after 3 years the quantity of light available for A. mangium intercrops was three times lower than under T. grandis. Simulations with A. mangium showed that practices such as pruning and widening tree spacing enable to increase the total transmitted light within the stand. On T. grandis, modification of the tree row azimuth resulted in changes in the spatial and seasonal distribution of light available for the intercrops. These results are discussed in terms of agroforestry system management.  
  Address [Sabatier, Sylvie; Barczi, Jean-Francois; Dauzat, Jean; Laurans, Marilyne] CIRAD, UMR AMAP Botan & Bioinformat Architecture Plantes, F-34398 Montpellier 5, France, Email: sylvie-annabel.sabatier@cirad.fr  
  Corporate Author Thesis  
  Publisher SPRINGER Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0167-4366 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000268865600004 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 199  
Permanent link to this record
 

 
Author Verheyen, K.; Vanhellemont, M.; Auge, H.; Baeten, L.; Baraloto, C.; Barsoum, N.; Bilodeau-Gauthier, S.; Bruelheide, H.; Castagneyrol, B.; Godbold, D.; Haase, J.; Hector, A.; Jactel, H.; Koricheva, J.; Loreau, M.; Mereu, S.; Messier, C.; Muys, B.; Nolet, P.; Paquette, A.; Parker, J.; Perring, M.; Ponette, Q.; Potvin, C.; Reich, P.; Smith, A.; Weih, M.; Scherer-Lorenzen, M. url  openurl
  Title Contributions of a global network of tree diversity experiments to sustainable forest plantations Type Journal Article
  Year 2016 Publication (up) Ambio Abbreviated Journal Ambio  
  Volume 45 Issue 1 Pages 29-41  
  Keywords Biodiversity experiments; Ecological restoration; Functional biodiversity research; Plantation forest; Sustainable forest management  
  Abstract The area of forest plantations is increasing worldwide helping to meet timber demand and protect natural forests. However, with global change, monospecific plantations are increasingly vulnerable to abiotic and biotic disturbances. As an adaption measure we need to move to plantations that are more diverse in genotypes, species, and structure, with a design underpinned by science. TreeDivNet, a global network of tree diversity experiments, responds to this need by assessing the advantages and disadvantages of mixed species plantations. The network currently consists of 18 experiments, distributed over 36 sites and five ecoregions. With plantations 1–15 years old, TreeDivNet can already provide relevant data for forest policy and management. In this paper, we highlight some early results on the carbon sequestration and pest resistance potential of more diverse plantations. Finally, suggestions are made for new, innovative experiments in understudied regions to complement the existing network. © 2015, Royal Swedish Academy of Sciences.  
  Address Department of Crop Production Ecology, Swedish University of Agricultural Sciences, PO Box 7043, Uppsala, Sweden  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 29 January 2016 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 652  
Permanent link to this record
 

 
Author Leroy, C.; Jauneau, A.; Quilichini, A.; Dejean, A.; Orivel, J. openurl 
  Title Comparative Structure and Ontogeny of the Foliar Domatia in Three Neotropical Myrmecophytes Type Journal Article
  Year 2010 Publication (up) American Journal of Botany Abbreviated Journal Am. J. Bot.  
  Volume 97 Issue 4 Pages 557-565  
  Keywords anatomy; ant-plant mutualism; Chrysobalanaceae; domatia; French Guiana; Hirtella physophora; Maieta guianensis; Melastomataceae; myrmecophyte; ontogeny; Tococa guianensis  
  Abstract The origin and timing of the appearance of leaf domatia during the ontogeny of plants are important evolutionary traits driving the maintenance of ant-plant associations. In this study conducted in French Guiana on Hirtella physophora, Maieta guianensis, and Tococa guianensis, we focused on the formation and development of leaf domatia having different morphological origins. We modeled the timing of the onset of these domatia, then compared their morpho-anatomical structure. Although the ontogenetic development of the domatia differed between species, they developed very early in the plant's ontogeny so that we did not note differences in the timing of the onset of these domatia. For H. physophora seedlings, a transitional leaf forms before the appearance of fully developed domatia, whereas in M. guianensis and T. guianensis the domatia forms abruptly without transitional leaves. Moreover, in all cases, the morpho-anatomical structure of the domatia differed considerably from the lamina. All three species had similar morpho-anatomical characteristics for the domatia, indicating a convergence in their structural and functional characteristics. This convergence between taxonomically distant plant species bearing domatia having different morphological origins could be interpreted as a product of the plant's evolution toward the morphology and anatomy most likely to maximize ant recruitment and long-term residence.  
  Address [Leroy, Celine; Dejean, Alain] CNRS, Unite Mixte Rech Ecol Forets Guyane, F-97379 Kourou, France, Email: Celine.Leroy@ecofog.gf  
  Corporate Author Thesis  
  Publisher BOTANICAL SOC AMER INC Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0002-9122 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000276045500003 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 65  
Permanent link to this record
 

 
Author Jaouen, G.; Almeras, T.; Coutand, C.; Fournier, M. openurl 
  Title How to determine sapling buckling risk with only a few measurements Type Journal Article
  Year 2007 Publication (up) American Journal of Botany Abbreviated Journal Am. J. Bot.  
  Volume 94 Issue 10 Pages 1583-1593  
  Keywords biomechanics; critical buckling height; French Guiana; risk factor; sapling; stem form; tropical rain forest; trunk volume  
  Abstract Tree buckling risk (actual height/critical buckling height) is an important biomechanical trait of plant growth strategies, and one that contributes to species coexistence. To estimate the diversity of this trait among wide samples, a method that minimizes damage to the plants is necessary. On the basis of the rarely used, complete version of Greenhill's model (1881, Proceedings of the Cambridge Philosophical Society 4(2): 65-73), we precisely measured all the necessary parameters on a sample of 236 saplings of 16 species. Then, using sensitivity (variance) analysis, regressions between successive models for risk factors and species ranks and the use of these models on samples of self- and nonself-supporting saplings, we tested different degrees of simplification up to the most simple and widely used formula that assumes that the tree is a cylindrical homogeneous pole. The size factor had the greatest effect on buckling risk, followed by the form factor and the modulus of elasticity of the wood. Therefore, estimates of buckling risk must consider not only the wood properties but especially the form factor. Finally, we proposed a simple but accurate method of assessing tree buckling risk that is applicable to a wide range of samples and that requires mostly nondestructive measurements.  
  Address INRA, UMR Ecol Forets Guyane, Kourou 97379, French Guiana, Email: jaouen-g@kourou.cirad.fr  
  Corporate Author Thesis  
  Publisher BOTANICAL SOC AMER INC Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0002-9122 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000251466600001 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 148  
Permanent link to this record
 

 
Author Baraloto, C.; Forget, P.M. openurl 
  Title Seed size, seedling morphology, and response to deep shade and damage in neotropical rain forest trees Type Journal Article
  Year 2007 Publication (up) American Journal of Botany Abbreviated Journal Am. J. Bot.  
  Volume 94 Issue 6 Pages 901-911  
  Keywords cotyledons; French Guiana; functional morphology; herbivory; life history; phylogeny; regeneration strategy; shade tolerance  
  Abstract To investigate the existence of coordinated sets of seedling traits adapted to contrasting establishment conditions, we examined evolutionary convergence in seedling traits for 299 French Guianan woody plant species and the stress response in a shadehouse of species representing seed size gradients within five major cotyledon morphology types. The French Guianan woody plant community has larger seeds than other tropical forest communities and the largest proportion of hypogeal cotyledon type (59.2%) reported for tropical forests. Yet the community includes many species with intermediate size seeds that produce seedlings with different cotyledonal morphologies. A split-plot factorial design with two light levels (0.8% and 16.1% PAR) and four damage treatments (control, seed damage, leaf damage, stem damage) was used in the shadehouse experiment. Although larger-seeded species had higher survival and slower growth, these patterns were better explained by cotyledon type than by seed mass. Even larger-seeded species with foliar cotyledons grew faster than species with reserve-type cotyledons, and survival after stem grazing was five times higher in seedlings with hypogeal cotyledons than with epigeal cotyledons. Thus, to predict seedling performance using seed size, seedling morphology must also be considered.  
  Address Inst Natl Rech Agronom, UMR, Ecol Forets Guyane, Kourou, France, Email: baraloto.c@kourou.cirad.fr  
  Corporate Author Thesis  
  Publisher BOTANICAL SOC AMER INC Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0002-9122 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000249830600001 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 159  
Permanent link to this record
 

 
Author Clair, B.; Fournier, M.; Prevost, M.F.; Beauchene, J.; Bardet, S. openurl 
  Title Biomechanics of buttressed trees: Bending strains and stresses Type Journal Article
  Year 2003 Publication (up) American Journal of Botany Abbreviated Journal Am. J. Bot.  
  Volume 90 Issue 9 Pages 1349-1356  
  Keywords biomechanics; buttress; Eleaocarpaceae; French Guiana; Sloanea spp.; tropical trees; wood  
  Abstract The different hypotheses about buttress function and formation mainly involve mechanical theory. Forces were applied to two trees of Sloanea spp.. a tropical genus that develops typical thin buttresses. and the three-dimensional strains were measured at different parts of the trunk base. Risks of failure were greater on the buttress sides, where shear and tangential stresses are greater, not on the ridges. in spite of high longitudinal (parallel to the grain) stresses. A simple beam model, computed from the second moment of area of digitized cross sections, is consistent with longitudinal strain variations but cannot predict accurately variations with height. Patterns of longitudinal strain variation along ridges are very different in the two individuals, owing to a pronounced lateral curvature in one specimen. The constant stress hypothesis is discussed based on these results. Without chronological data during the development of the tree. it cannot be proved that buttress formation is activated by stress or strain.  
  Address CIRAD ENGREF INRA, UMR Ecol Forets Guyane, F-97310 Kourou, Guyane Francais, France  
  Corporate Author Thesis  
  Publisher BOTANICAL SOC AMER INC Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0002-9122 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000185459000010 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 244  
Permanent link to this record
Select All    Deselect All
 |   | 
Details
   print

Save Citations:
Export Records: