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Hein, P.R.G.; Chaix, G.; Clair, B.; Brancheriau, L.; Gril, J. |
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Spatial variation of wood density, stiffness and microfibril angle along Eucalyptus trunks grown under contrasting growth conditions |
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Journal Article |
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2016 |
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Trees – Structure and Function |
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30 |
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3 |
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871-882 |
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Sloped terrains tend to produce trees with higher radial variation in wood density while at high wind speeds, the wood tends to present higher stiffness and lower MFA in Eucalyptus. |
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EcoFoG @ webmaster @ Hein2016 |
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720 |
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Stahl, C.; Freycon, V.; Fontaine, S.; Dezecache, C.; Ponchant, L.; Picon-Cochard, C.; Klumpp, K.; Soussana, J.-F.; Blanfort, V. |
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Soil carbon stocks after conversion of Amazonian tropical forest to grazed pasture: importance of deep soil layers |
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2016 |
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Regional Environmental Change |
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16 |
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7 |
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2059-2069 |
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Recent studies suggest that carbon (C) is stored in the topsoil of pastures established after deforestation. However, little is known about the long-term capacity of tropical pastures to sequester C in different soil layers after deforestation. Deep soil layers are generally not taken into consideration or are underestimated when C storage is calculated. Here we show that in French Guiana, the C stored in the deep soil layers contributes significantly to C stocks down to a depth of 100 cm and that C is sequestered in recalcitrant soil organic matter in the soil below a depth of 20 cm. The contribution of the 50–100 cm soil layer increased from 22 to 31 % with the age of the pasture. We show that long-term C sequestration in C4 tropical pastures is linked to the development of C3 species (legumes and shrubs), which increase both inputs of N into the ecosystem and the C:N ratio of soil organic matter. The deep soil under old pastures contained more C3 carbon than the native forest. If C sequestration in the deep soil is taken into account, our results suggest that the soil C stock in pastures in Amazonia would be higher with sustainable pasture management, in particular by promoting the development of legumes already in place and by introducing new species. |
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1436-378x |
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EcoFoG @ webmaster @ Stahl2016 |
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721 |
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Morel-Journel, T.; Piponiot, C.; Vercken, E.; Mailleret, L. |
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Evidence for an optimal level of connectivity for establishment and colonization |
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2016 |
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Biology Letters |
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Biol Lett |
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12 |
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11 |
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20160704 |
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Dispersal is usually associated with the spread of invasive species, but it also has two opposing effects, one decreasing and the other increasing the probability of establishment. Indeed, dispersal both slows population growth at the site of introduction and increases the likelihood of surrounding habitat being colonized. The connectivity of the introduction site is likely to affect dispersal, and, thus, establishment, according to the dispersal behaviour of individuals. Using individual-based models and microcosm experiments on minute wasps, we demonstrated the existence of a hump-shaped relationship between connectivity and establishment in situations in which individual dispersal resembled a diffusion process. These results suggest that there is an optimal level of connectivity for the establishment of introduced populations locally at the site of introduction, and regionally over the whole landscape. |
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EcoFoG @ webmaster @ |
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722 |
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Rutishauser, E.; Herault, B.; Petronelli, P.; Sist, P. |
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Tree Height Reduction After Selective Logging in a Tropical Forest |
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Journal Article |
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2016 |
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Biotropica |
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Biotropica |
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48 |
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3 |
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285-289 |
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carbon sequestration; forest management; logging; tropical forests; wood production |
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By harvesting scattered large trees, selective logging increases light availability and thereby stimulates growth and crown expansion at early-life stage among remnant trees. We assessed the effects of logging on total and merchantable bole (i.e., lowest branch at crown base) heights on 952 tropical canopy trees in French Guiana. We observed reductions in both total (mean, −2.3 m) and bole (mean, −2.0 m) heights more than a decade after selective logging. Depending on local logging intensity, height reductions resulted in 2–13 percent decreases in aboveground tree biomass and 3–17 percent decreases in bole volume. These results highlight the adverse effects of logging at both tree and stand levels. This decrease in height is a further threat to future provision of key environmental services, such as timber production and carbon sequestration. |
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1744-7429 |
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EcoFoG @ webmaster @ |
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723 |
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Goulamoussene, Youven; Bedeau, Caroline; Descroix, Laurent; Deblauwe, Vincent; Linguet, Laurent; Herault, Bruno |
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Weak Environmental Controls of Tropical Forest Canopy Height in the Guiana Shield Remote Sensing |
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Journal Article |
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2016 |
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Remote Sensing |
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Remote Sens |
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8 |
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9 |
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747 |
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Canopy height is a key variable in tropical forest functioning and for regional carbon inventories. We investigate the spatial structure of the canopy height of a tropical forest, its relationship with environmental physical covariates, and the implication for tropical forest height variation mapping. Making use of high-resolution maps of LiDAR-derived Digital Canopy Model (DCM) and environmental covariates from a Digital Elevation Model (DEM) acquired over 30,000 ha of tropical forest in French Guiana, we first show that forest canopy height is spatially correlated up to 2500 m. Forest canopy height is significantly associated with environmental variables, but the degree of correlation varies strongly with pixel resolution. On the whole, bottomland forests generally have lower canopy heights than hillslope or hilltop forests. However, this global picture is very noisy at local scale likely because of the endogenous gap-phase forest dynamic processes. Forest canopy height has been predictively mapped across a pixel resolution going from 6 m to 384 m mimicking a low resolution case of 3 points·km − 2 . Results of canopy height mapping indicated that the error for spatial model with environment effects decrease from 8.7 m to 0.91 m, depending of the pixel resolution. Results suggest that, outside the calibration plots, the contribution of environment in shaping the global canopy height distribution is quite limited. This prevents accurate canopy height mapping based only on environmental information, and suggests that precise canopy height maps, for local management purposes, can only be obtained with direct LiDAR monitoring. |
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EcoFoG @ webmaster @ |
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724 |
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Sullivan, M.J.P.; Talbot, J.; Lewis, S.L.; Phillips, O.L.; Qie, L.; Begne, S.K.; Chave, J.; Cuni-Sanchez, A.; Hubau, W.; Lopez-Gonzalez, G.; Miles, L.; Monteagudo-Mendoza, A.; Sonké, B.; Sunderland, T.; Ter Steege, H.; White, L.J.T.; Affum-Baffoe, K.; Aiba, S.-I.; De Almeida, E.C.; De Oliveira, E.A.; Alvarez-Loayza, P.; Dávila, E.Á.; Andrade, A.; Aragão, L.E.O.C.; Ashton, P.; Aymard, G.A.; Baker, T.R.; Balinga, M.; Banin, L.F.; Baraloto, C.; Bastin, J.-F.; Berry, N.; Bogaert, J.; Bonal, D.; Bongers, F.; Brienen, R.; Camargo, J.L.C.; Cerón, C.; Moscoso, V.C.; Chezeaux, E.; Clark, C.J.; Pacheco, Á.C.; Comiskey, J.A.; Valverde, F.C.; Coronado, E.N.H.; Dargie, G.; Davies, S.J.; De Canniere, C.; Djuikouo, M.N.; Doucet, J.-L.; Erwin, T.L.; Espejo, J.S.; Ewango, C.E.N.; Fauset, S.; Feldpausch, T.R.; Herrera, R.; Gilpin, M.; Gloor, E.; Hall, J.S.; Harris, D.J.; Hart, T.B.; Kartawinata, K.; Kho, L.K.; Kitayama, K.; Laurance, S.G.W.; Laurance, W.F.; Leal, M.E.; Lovejoy, T.; Lovett, J.C.; Lukasu, F.M.; Makana, J.-R.; Malhi, Y.; Maracahipes, L.; Marimon, B.S.; Junior, B.H.M.; Marshall, A.R.; Morandi, P.S.; Mukendi, J.T.; Mukinzi, J.; Nilus, R.; Vargas, P.N.; Camacho, N.C.P.; Pardo, G.; Peña-Claros, M.; Petronelli, P.; Pickavance, G.C.; Poulsen, A.D.; Poulsen, J.R.; Primack, R.B.; Priyadi, H.; Quesada, C.A.; Reitsma, J.; Réjou-Méchain, M.; Restrepo, Z.; Rutishauser, E.; Salim, K.A.; Salomão, R.P.; Samsoedin, I.; Sheil, D.; Sierra, R.; Silveira, M.; Slik, J.W.F.; Steel, L.; Taedoumg, H.; Tan, S.; Terborgh, J.W.; Thomas, S.C.; Toledo, M.; Umunay, P.M.; Gamarra, L.V.; Vieira, I.C.G.; Vos, V.A.; Wang, O.; Willcock, S.; Zemagho, L. |
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Diversity and carbon storage across the tropical forest biome |
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Journal Article |
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2017 |
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Scientific Reports |
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Sci. Rep. |
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7 |
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39102 |
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Tropical forests are global centres of biodiversity and carbon storage. Many tropical countries aspire to protect forest to fulfil biodiversity and climate mitigation policy targets, but the conservation strategies needed to achieve these two functions depend critically on the tropical forest tree diversity-carbon storage relationship. Assessing this relationship is challenging due to the scarcity of inventories where carbon stocks in aboveground biomass and species identifications have been simultaneously and robustly quantified. Here, we compile a unique pan-Tropical dataset of 360 plots located in structurally intact old-growth closed-canopy forest, surveyed using standardised methods, allowing a multi-scale evaluation of diversity-carbon relationships in tropical forests. Diversity-carbon relationships among all plots at 1 ha scale across the tropics are absent, and within continents are either weak (Asia) or absent (Amazonia, Africa). A weak positive relationship is detectable within 1 ha plots, indicating that diversity effects in tropical forests may be scale dependent. The absence of clear diversity-carbon relationships at scales relevant to conservation planning means that carbon-centred conservation strategies will inevitably miss many high diversity ecosystems. As tropical forests can have any combination of tree diversity and carbon stocks both require explicit consideration when optimising policies to manage tropical carbon and biodiversity. © The Author(s) 2017. |
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School of Environment, Natural Resources and Geography, Bangor University, Bangor, United Kingdom |
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Export Date: 3 February 2017 |
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EcoFoG @ webmaster @ |
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725 |
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Bompy, F.; Lequeue, G.; Imbert, D.; Dulormne, M. |
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Increasing fluctuations of soil salinity affect seedling growth performances and physiology in three Neotropical mangrove species |
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2014 |
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Plant and Soil |
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Plant and Soil |
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380 |
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1 |
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399-413 |
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Acclimation; Avicennia germinans; Hypersalinity; Laguncularia racemosa; Leaf gas exchange; Rhizophora mangle; Salt stress |
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Background: Micro-tidal wetlands are subject to strong seasonal variations of soil salinity that are likely to increase in amplitude according to climate model predictions for the Caribbean. Whereas the effects of constant salinity levels on the physiology of mangrove species have been widely tested, little is known about acclimation to fluctuations in salinity. Aims and methods: The aim of this experiment was to characterize the consequences of the rate of increase in salinity (slow versus fast) and salinity fluctuations over time versus constant salt level. Seedling mortality, growth, and leaf gas exchange of three mangrove species, Avicennia germinans, Laguncularia racemosa, and Rhizophora mangle were investigated in semicontrolled conditions at different salt levels (0, 685, 1025, and 1370 mM NaCl). Results: Slow salinity increase up to 685 mM induced acclimation, improving the salt tolerance of A. germinans and L. racemosa, but had no effect on R. mangle. During fluctuations between 0 and 685 mM, A. germinans and R. mangle were not affected by a salinity drop to zero, whereas L. racemosa took advantage of the brief freshwater episode as shown by the durable improvement of photosynthesis and biomass production. Conclusions: This study provides new insights into physiological resistance and acclimation to salt stress. We show that seasonal variations of salinity may affect mangrove seedlings' morphology and physiology as much as annual mean salinity. Moreover, more severe dry seasons due to climate change may impact tree stature and species composition in mangroves through higher mortality rates and physiological disturbance at the seedling stage. © 2014 Springer International Publishing Switzerland. |
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EA 926 DYNECAR, UFR des Sciences Exactes et Naturelles, Université des Antilles et de la Guyane, BP 592, 97 159 Pointe-à-Pitre cedex, Guadeloupe (F.W.I.), France |
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Cited By :7; Export Date: 7 February 2017 |
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EcoFoG @ webmaster @ |
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726 |
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Dulormne, M.; Musseau, O.; Muller, F.; Toribio, A.; Bâ, A. |
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Effects of NaCl on growth, water status, N2 fixation, and ion distribution in Pterocarpus officinalis seedlings |
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Journal Article |
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2010 |
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Plant and Soil |
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Plant and Soil |
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327 |
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1 |
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23-34 |
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Bradyrhizobium; Leaf water potential; Nodulation; Salt; Swamp forest |
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Pterocarpus officinalis (Fabaceae) dominates in the swamp forests of the Lesser Antilles, submitted to strong variations of soil salinity (30-445 mM). This study aimed to assess the effect of salinity on growth, nodulation, N2 fixation, water status and ions content in P. officinalis and to clarify the mechanisms involved. Seedlings inoculated or not with two strains from areas of contrasting salinity levels (< to 50 or 445 mM) were watered with 0, 171 and 342 mM solutions of NaCl in greenhouse conditions. Non-inoculated seedlings were tolerant to a salinity of 171 mM, with no significant effect on seedling biomass. Evapotranspiration per unit of leaf area (E/TLa) remained unchanged at 171 mM. Maintenance of a constant E/TLa and especially the control of ion transport to the upper parts of the plant could explain seedling salt tolerance up to intermediate salinity conditions (171 mM). The two strains have a 99.8% genetic identity in spite of differences in their original habitats, this explaining the similar response of the symbiosis to salinity. The higher salt sensitivity of inoculated seedlings was linked to the sensitivity of both Bradyrhizobium strains (reduction of free-living cells) and to that of the nodulation process (fewer nodules and inhibition of N2-fixation) to intermediate salinity. © Springer Science + Business Media B.V. 2009. |
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LSTM-UMR 113, Université des Antilles et de la Guyane, UFR des Sciences Exactes et Naturelles, B.P. 592, 97159 Pointe-à-Pitre, Guadeloupe (F.W.I.), France |
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Cited By :12; Export Date: 7 February 2017 |
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EcoFoG @ webmaster @ |
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727 |
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Martos, F.; Dulormne, M.; Pailler, T.; Bonfante, P.; Faccio, A.; Fournel, J.; Dubois, M.-P.; Selosse, M.-A. |
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Independent recruitment of saprotrophic fungi as mycorrhizal partners by tropical achlorophyllous orchids |
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Journal Article |
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2009 |
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New Phytologist |
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New Phytologist |
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184 |
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3 |
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668-681 |
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Mycoheterotrophy; Mycorrhizas; Orchids; Rainforests; Saprotrophic fungi; Stable isotopes |
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Mycoheterotrophic orchids have adapted to shaded forest understory by shifting to achlorophylly and receiving carbon from their mycorrhizal fungi. In temperate forests, they associate in a highly specific way with fungi forming ectomycorrhizas on nearby trees, and exploiting tree photosynthates. However, many rainforests lack ectomycorrhizal fungi, and there is evidence that some tropical Asiatic species associate with saprotrophic fungi. To investigate this in different geographic and phylogenetic contexts, we identified the mycorrhizal fungi supporting two tropical mycoheterotrophic orchids from Mascarene (Indian Ocean) and Caribbean islands. We tested their possible carbon sources by measuring natural nitrogen (15N) and carbon (13C) abundances. Saprotrophic basidiomycetes were found: Gastrodia similis associates with a wood-decaying Resinicium (Hymenochaetales); Wullschlaegelia aphylla associates with both litter-decaying Gymnopus and Mycena species, whose rhizomorphs link orchid roots to leaf litter. The 15N and 13C abundances make plausible food chains from dead wood to G. similis and from dead leaves to W. aphylla. We propose that temperature and moisture in rainforests, but not in most temperate forests, may favour sufficient saprotrophic activity to support development of mycoheterotrophs. By enlarging the spectrum of mycorrhizal fungi and the level of specificity in mycoheterotrophic orchids, this study provides new insights on orchid and mycorrhizal biology in the tropics. © 2009 New Phytologist. |
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Dipartimento di Biologia Vegetale dell'Università, Istituto per la Protezione Delle Piante – CNR, Viale Mattioli 25, I-10125 Torino, Italy |
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Cited By :65; Export Date: 7 February 2017 |
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EcoFoG @ webmaster @ |
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728 |
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Goulamoussene, Y.; Bedeau, C.; Descroix, L.; Linguet, L.; Herault, B. |
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Environmental control of natural gap size distribution in tropical forests |
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Journal Article |
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2017 |
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Biogeosciences |
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Biogeosciences |
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14 |
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2 |
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353-364 |
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Natural disturbances are the dominant form of forest regeneration and dynamics in unmanaged tropical forests. Monitoring the size distribution of treefall gaps is important to better understand and predict the carbon budget in response to land use and other global changes. In this study, we model the size frequency distribution of natural canopy gaps with a discrete power law distribution. We use a Bayesian framework to introduce and test, using Monte Carlo Markov chain and Kuo-Mallick algorithms, the effect of local physical environment on gap size distribution. We apply our methodological framework to an original light detecting and ranging dataset in which natural forest gaps were delineated over 30 000 ha of unmanaged forest. We highlight strong links between gap size distribution and environment, primarily hydrological conditions and topography, with large gaps being more frequent on floodplains and in wind-exposed areas. In the future, we plan to apply our methodological framework on a larger scale using satellite data. Additionally, although gap size distribution variation is clearly under environmental control, variation in gap size distribution in time should be tested against climate variability. © Author(s) 2017. |
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Cirad, UMR EcoFoG, AgroParisTech, CNRS, Inra, Univ Antilles, Univ Guyane, Kourou, French Guiana |
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Export Date: 7 February 2017 |
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no |
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EcoFoG @ webmaster @ |
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729 |
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| Permanent link to this record |
