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Wagner, F.H.; Herault, B.; Bonal, D.; Stahl, C.; Anderson, L.O.; Baker, T.R.; Sebastian Becker, G.; Beeckman, H.; Boanerges Souza, D.; Cesar Botosso, P.; Bowman, D.M.J.S.; Bräuning, A.; Brede, B.; Irving Brown, F.; Julio Camarero, J.; Camargo, P.B.; Cardoso, F.C.G.; Carvalho, F.A.; Castro, W.; Koloski Chagas, R.; Chave, J.; Chidumayo, E.N.; Clark, D.A.; Regina Capellotto Costa, F.; Couralet, C.; Henrique Da Silva Mauricio, P.; Dalitz, H.; Resende De Castro, V.; Milani, J.E.D.F.; Consuelo De Oliveira, E.; De Souza Arruda, L.; Devineau, J.L.; Drew, D.M.; Dünisch, O.; Durigan, G.; Elifuraha, E.; Fedele, M.; Ferreira Fedele, L.; Figueiredo Filho, A.; Finger, C.A.G.; César Franco, A.; Jnior, L.F.; Galvão, F.; Gebrekirstos, A.; Gliniars, R.; Maurício Lima De Alencastro Graça, P.; Griffiths, A.D.; Grogan, J.; Guan, K.; Homeier, J.; Raquel Kanieski, M.; Khoon Kho, L.; Koenig, J.; Valerio Kohler, S.; Krepkowski, J.; Lemos-Filho, J.P.; Lieberman, D.; Eugene Lieberman, M.; Sergio Lisi, C.; Longhi Santos, T.; Ayala, J.L.L.; Eijji Maeda, E.; Malhi, Y.; Maria, V.R.B.; Marques, M.C.M.; Marques, R.; Maza Chamba, H.; Mbwambo, L.; Liana Lisboa Melgaço, K.; Angela Mendivelso, H.; Murphy, B.P.; O'Brien, J.J.; F. Oberbauer, S.; Okada, N.; Plissier, R.; Prior, L.D.; Alejandro Roig, F.; Ross, M.; Rodrigo Rossatto, D.; Rossi, V.; Rowland, L.; Rutishauser, E.; Santana, H.; Schulze, M.; Selhorst, D.; Rodrigues Silva, W.; Silveira, M.; Spannl, S.; Swaine, M.D.; Toledo, J.J.; Miranda Toledo, M.; Toledo, M.; Toma, T.; Tomazello Filho, M.; Ignacio Valdez Hernández, J.; Verbesselt, J.; Aparecida Vieira, S.; Vincent, G.; Volkmer De Castilho, C.; Volland, F.; Worbes, M.; Lea Bolzan Zanon, M.; Aragão, L.E.O.C. | ||||
| Title | Climate seasonality limits leaf carbon assimilation and wood productivity in tropical forests | Type | Journal Article | ||
| Year | 2016 | Publication | Biogeosciences | Abbreviated Journal | Biogeosciences |
| Volume | 13 | Issue | 8 | Pages | 2537-2562 |
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| Abstract | The seasonal climate drivers of the carbon cycle in tropical forests remain poorly known, although these forests account for more carbon assimilation and storage than any other terrestrial ecosystem. Based on a unique combination of seasonal pan-tropical data sets from 89 experimental sites (68 include aboveground wood productivity measurements and 35 litter productivity measurements), their associated canopy photosynthetic capacity (enhanced vegetation index, EVI) and climate, we ask how carbon assimilation and aboveground allocation are related to climate seasonality in tropical forests and how they interact in the seasonal carbon cycle. We found that canopy photosynthetic capacity seasonality responds positively to precipitation when rainfall is < 2000ĝ€-mmĝ€-yrĝ'1 (water-limited forests) and to radiation otherwise (light-limited forests). On the other hand, independent of climate limitations, wood productivity and litterfall are driven by seasonal variation in precipitation and evapotranspiration, respectively. Consequently, light-limited forests present an asynchronism between canopy photosynthetic capacity and wood productivity. First-order control by precipitation likely indicates a decrease in tropical forest productivity in a drier climate in water-limited forest, and in current light-limited forest with future rainfall < 2000ĝ€-mmĝ€-yrĝ'1. Author(s) 2016. | ||||
| Address | College of Life and Environmental Sciences, University of Exeter, Exeter, United Kingdom | ||||
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| Notes | Export Date: 20 May 2016 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 680 | ||
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| Author |
Wagner, F.; Rutishauser, E.; Blanc, L.; Herault, B. | ||||
| Title | Effects of Plot Size and Census Interval on Descriptors of Forest Structure and Dynamics | Type | Journal Article | ||
| Year | 2010 | Publication | Biotropica | Abbreviated Journal | Biotropica |
| Volume | 42 | Issue | 6 | Pages | 664-671 |
| Keywords | Amazonia; biomass fluxes; coefficient of variation; forest permanent plots; turnover rates; WinBUGS | ||||
| Abstract | This study was designed to explicitly formulate the effect of census interval and plot size on the variability of descriptors of tropical forest structure (stand density, basal area, aboveground biomass [AGB]) and dynamic (tree growth, mortality and recruitment rates, biomass fluxes). A unique dataset from a broad plot network (37.5 ha) surveyed every 2 yr over a 16-yr period was used to develop and parameterize a new statistical model predicting the coefficients of variation for each forest descriptor. More than 90 percent of the inherent variability of these coefficients was predicted using a simple model including plot size and census interval in a Bayesian modeling framework. All descriptors of forest structure varied by <10 percent for plot sizes 42 ha. Among the descriptors of forest dynamics, AGB loss was the most variable. The number of 6.25 ha plots required to estimate its mean, over a 16-yr period, within a 20 percent error of the mean remains above four. This contrasts with a relative constant flux of biomass entering the plot through tree growth and tree recruitment. Tree growth was remarkably well estimated with <15 percent variability for a 2-yr census in a plot of 2 ha. This study provides an easy method to assess dataset limitations in efforts to estimate descriptors of forest structure and dynamic, which is of primary importance to decipher any clear consequences of global change in tropical forests. | ||||
| Address | [Wagner, Fabien; Herault, Bruno] Univ Antilles Guyane, UMR Ecol Forets Guyane, Kourou 97379, French Guiana, Email: bruno.herault@ecofog.gf | ||||
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| Publisher | WILEY-BLACKWELL PUBLISHING, INC | Place of Publication | Editor | ||
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| ISSN | 0006-3606 | ISBN | Medium | ||
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| Notes | ISI:000283949700006 | Approved | no | ||
| Call Number | EcoFoG @ eric.marcon @ | Serial | 16 | ||
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Wagner, F.; Rossi, V.; Stahl, C.; Bonal, D.; Herault, B. | ||||
| Title | Water availability is the main climate driver of neotropical tree growth | Type | Journal Article | ||
| Year | 2012 | Publication | PLoS ONE | Abbreviated Journal | PLoS ONE |
| Volume | 7 | Issue | 4 | Pages | e34074 |
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| Abstract | Climate models for the coming century predict rainfall reduction in the Amazonian region, including change in water availability for tropical rainforests. Here, we test the extent to which climate variables related to water regime, temperature and irradiance shape the growth trajectories of neotropical trees. We developed a diameter growth model explicitly designed to work with asynchronous climate and growth data. Growth trajectories of 205 individual trees from 54 neotropical species censused every 2 months over a 4-year period were used to rank 9 climate variables and find the best predictive model. About 9% of the individual variation in tree growth was imputable to the seasonal variation of climate. Relative extractable water was the main predictor and alone explained more than 60% of the climate effect on tree growth, i.e. 5.4% of the individual variation in tree growth. Furthermore, the global annual tree growth was more dependent on the diameter increment at the onset of the rain season than on the duration of dry season. The best predictive model included 3 climate variables: relative extractable water, minimum temperature and irradiance. The root mean squared error of prediction (0.035 mm.d -1) was slightly above the mean value of the growth (0.026 mm.d -1). Amongst climate variables, we highlight the predominant role of water availability in determining seasonal variation in tree growth of neotropical forest trees and the need to include these relationships in forest simulators to test, in silico, the impact of different climate scenarios on the future dynamics of the rainforest. © 2012 Wagner et al. | ||||
| Address | INRA, UMR 'Ecologie et Ecophysiologie Forestière', Champenoux, France | ||||
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| ISSN | 19326203 (Issn) | ISBN | Medium | ||
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| Notes | Export Date: 24 April 2012; Source: Scopus; Art. No.: e34074; doi: 10.1371/journal.pone.0034074; Language of Original Document: English; Correspondence Address: Wagner, F.; Université des Antilles et de la Guyane, UMR 'Ecologie des Forêts de Guyane', BP 709, Kourou, France; email: fabien.wagner@ecofog.gf | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 394 | ||
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| Author |
Wagner, F.; Rossi, V.; Stahl, C.; Bonal, D.; Herault, B. | ||||
| Title | Asynchronism in leaf and wood production in tropical forests: A study combining satellite and ground-based measurements | Type | Journal Article | ||
| Year | 2013 | Publication | Biogeosciences | Abbreviated Journal | Biogeosciences |
| Volume | 10 | Issue | 11 | Pages | 7307-7321 |
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| Abstract | The fixation of carbon in tropical forests mainly occurs through the production of wood and leaves, both being the principal components of net primary production. Currently field and satellite observations are independently used to describe the forest carbon cycle, but the link between satellite-derived forest phenology and field-derived forest productivity remains opaque. We used a unique combination of a MODIS enhanced vegetation index (EVI) dataset, a wood production model based on climate data and direct litterfall observations at an intra-annual timescale in order to question the synchronism of leaf and wood production in tropical forests. Even though leaf and wood biomass fluxes had the same range (respectively 2.4 ± 1.4 and 2.2 ± 0.4 Mg C ha-1 yr-1), they occurred separately in time. EVI increased with leaf renewal at the beginning of the dry season, when solar irradiance was at its maximum. At this time, wood production stopped. At the onset of the rainy season, when new leaves were fully mature and water available again, wood production quickly increased to reach its maximum in less than a month, reflecting a change in carbon allocation from short-lived pools (leaves) to long-lived pools (wood). The time lag between peaks of EVI and wood production (109 days) revealed a substantial decoupling between the leaf renewal assumed to be driven by irradiance and the water-driven wood production. Our work is a first attempt to link EVI data, wood production and leaf phenology at a seasonal timescale in a tropical evergreen rainforest and pave the way to develop more sophisticated global carbon cycle models in tropical forests. © 2013 Author(s). | ||||
| Address | INRA, UMR EEF 1137, 54280 Champenoux, France | ||||
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| ISSN | 17264170 (Issn) | ISBN | Medium | ||
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| Notes | Export Date: 2 December 2013; Source: Scopus; doi: 10.5194/bg-10-7307-2013; Language of Original Document: English; Correspondence Address: Wagner, F.; CIRAD, UMR Ecologie des Forêts de Guyane, Kourou, French Guiana, French Guiana; email: wagner.h.fabien@gmail.com; References: Allen, R., Smith, M., Pereira, L., Perrier, A., An update for the calculation of reference evapotranspiration (1994) Journal of the ICID, 43, pp. 35-92; Anderson, L.O., Biome-scale forest properties in Amazonia based on field and satellite observations (2012) Remote Sens., 4, pp. 1245-1271. , doi:10.3390/rs4051245; Arias, P.A., Fu, R., Hoyos, C.D., Li, W., Zhou, L., Changes in cloudiness over the Amazon rainforests during the last two decades: Diagnostic and potential causes (2011) Clim. Dynam., 37, pp. 1151-1164. , doi:10.1007/s00382-010-0903-2; Asner, G., Townsend, A., Braswell, B., Satellite observation of El Nino effects on Amazon forest phenology and productivity (2000) Geophys. Res. 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Nat., 143, pp. 192-199. , doi:10.1086/285600; Wurth, M.K.R., Pelaez-Riedl, S., Wright, S.J., Korner, C., Non-structural carbohydrate pools in a tropical forest (2005) Oecologia, 143 (1), pp. 11-24. , DOI 10.1007/s00442-004-1773-2; Zalamea, M., Gonzalez, G., Leaffall phenology in a subtropical wet forest in Puerto Rico: From species to community patterns (2008) Biotropica, 40 (3), pp. 295-304. , DOI 10.1111/j.1744-7429.2007.00389.x; Zhang, X., Friedl, M.A., Schaaf, C.B., Strahler, A.H., Hodges, J.C.F., Gao, F., Reed, B.C., Huete, A., Monitoring vegetation phenology using MODIS (2003) Remote Sensing of Environment, 84 (3), pp. 471-475. , DOI 10.1016/S0034-4257(02)00135-9, PII S0034425702001359 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 512 | ||
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| Author |
Wagner, F.; Rossi, V.; Baraloto, C.; Bonal, D.; Stahl, C.; Herault, B. | ||||
| Title | Are commonly measured functional traits involved in tropical tree responses to climate? | Type | Journal Article | ||
| Year | 2014 | Publication | International Journal of Ecology | Abbreviated Journal | Int. J. Ecol. |
| Volume | 2014 | Issue | 389409 | Pages | |
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| Abstract | Climate models predict significant rainfall reduction in Amazonia, reducing water availability for trees. We present how functional traits modulate the tree growth response to climate. We used data from 3 years of bimestrial growth measurements for 204 trees of 53 species in the forest of Paracou, French Guiana. We integrated climate variables from an eddy covariance tower and functional trait values describing life history, leaf, and stem economics. Our results indicated that the measured functional traits are to some extent linked to the response of trees to climate but they are poor predictors of the tree climate-induced growth variation. Tree growth was affected by water availability for most of the species with different species growth strategies in drought conditions. These strategies were linked to some functional traits, especially maximum height and wood density. These results suggest that (i) trees seem adapted to the dry season at Paracou but they show different growth responses to drought, (ii) drought response is linked to growth strategy and is partly explained by functional traits, and (iii) the limited part of the variation of tree growth explained by functional traits may be a strong limiting factor for the prediction of tree growth response to climate. © 2014 Fabien Wagner et al. | ||||
| Address | CIRAD, UMR Systèmes d'Elevage en Milieux Méditerranéens et Tropicaux, 97379 Kourou, France | ||||
| Corporate Author | Thesis | ||||
| Publisher | Hindawi Publishing Corporation | Place of Publication | Editor | ||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 16879716 (Issn) | ISBN | Medium | ||
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| Notes | Export Date: 30 July 2014; Correspondence Address: Wagner, F.; Remote Sensing Division, National Institute for Space Research (INPE), 12227-010 São José dos Campos, SP, Brazil; email: wagner.h.fabien@gmail.com | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 556 | ||
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| Author |
Wagner, F.; Rossi, V.; Aubry-Kientz, M.; Bonal, D.; Dalitz, H.; Gliniars, R.; Stahl, C.; Trabucco, A.; Herault, B. | ||||
| Title | Pan-tropical analysis of climate effects on seasonal tree growth | Type | Journal Article | ||
| Year | 2014 | Publication | PLoS ONE | Abbreviated Journal | PLoS ONE |
| Volume | 9 | Issue | 3 | Pages | e92337 |
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| Abstract | Climate models predict a range of changes in tropical forest regions, including increased average temperatures, decreased total precipitation, reduced soil moisture and alterations in seasonal climate variations. These changes are directly related to the increase in anthropogenic greenhouse gas concentrations, primarily CO2. Assessing seasonal forest growth responses to climate is of utmost importance because woody tissues, produced by photosynthesis from atmospheric CO2, water and light, constitute the main component of carbon sequestration in the forest ecosystem. In this paper, we combine intra-annual tree growth measurements from published tree growth data and the corresponding monthly climate data for 25 pan-tropical forest sites. This meta-analysis is designed to find the shared climate drivers of tree growth and their relative importance across pan-tropical forests in order to improve carbon uptake models in a global change context. Tree growth reveals significant intra-annual seasonality at seasonally dry sites or in wet tropical forests. Of the overall variation in tree growth, 28.7% was explained by the site effect, i.e. the tree growth average per site. The best predictive model included four climate variables: precipitation, solar radiation (estimated with extrasolar radiation reaching the atmosphere), temperature amplitude and relative soil water content. This model explained more than 50% of the tree growth variations across tropical forests. Precipitation and solar radiation are the main seasonal drivers of tree growth, causing 19.8% and 16.3% of the tree growth variations. Both have a significant positive association with tree growth. These findings suggest that forest productivity due to tropical tree growth will be reduced in the future if climate extremes, such as droughts, become more frequent. © 2014 Wagner et al. | ||||
| Address | Division of Forest, Nature, and Landscape, KU Leuven, Leuven, Belgium | ||||
| Corporate Author | Thesis | ||||
| Publisher | Public Library of Science | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 19326203 (Issn) | ISBN | Medium | ||
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| Notes | Export Date: 30 May 2014; Source: Scopus; Art. No.: e92337; Coden: Polnc; Language of Original Document: English | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 543 | ||
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| Author |
Wagner, F.; Herault, B.; Stahl, C.; Bonal, D.; Rossi, V. | ||||
| Title | Modeling water availability for trees in tropical forests | Type | Journal Article | ||
| Year | 2011 | Publication | Agricultural and Forest Meteorology | Abbreviated Journal | Agric. For. Meteorol. |
| Volume | 151 | Issue | 9 | Pages | 1202-1213 |
| Keywords | Water balance model; Amazonian rainforest; Time domain reflectometer; Bayesian inference; Tree drought stress | ||||
| Abstract | Modeling soil water availability for tropical trees is a prerequisite to predicting the future impact of climate change on tropical forests. In this paper we develop a discrete-time deterministic water balance model adapted to tropical rainforest climates, and we validate it on a large dataset that includes micrometeorological and soil parameters along a topographic gradient in a lowland forest of French Guiana. The model computes daily water fluxes (rainfall interception, drainage, tree transpiration and soil plus understorey evapotranspiration) and soil water content using three input variables: daily precipitation, potential evapotranspiration and solar radiation. A novel statistical approach is employed that uses Time Domain Reflectometer (TDR) soil moisture data to estimate water content at permanent wilting point and at field capacity, and root distribution. Inaccuracy of the TDR probes and other sources of uncertainty are taken into account by model calibration through a Bayesian framework. Model daily output includes relative extractable water, REW, i.e. the daily available water standardized by potential available water. The model succeeds in capturing temporal variations in REW regardless of topographic context. The low Root Mean Square Error of Predictions suggests that the model captures the most important drivers of soil water dynamics, i.e. water refilling and root water extraction. Our model thus provides a useful tool to explore the response of tropical forests to climate scenarios of changing rainfall regime and intensity. (C) 2011 Elsevier B.V. All rights reserved. | ||||
| Address | [Wagner, F; Herault, B] Univ Antilles Guyane, UMR Ecol Forets Guyane, F-97387 Kourou, France, Email: fabien.wagner@ecofog.gf | ||||
| Corporate Author | Thesis | ||||
| Publisher | Elsevier Science Bv | 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 | ||
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| Notes | WOS:000294032000005 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 337 | ||
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| Author |
Vleminckx, Jason ; Fortunel, Claire ; Valverde-Barrantes, Oscar ; Paine, C.E. Timothy ; Engel, Julien ; Petronelli, Pascal ; Dourdain, Aurélie K. ; Guevara, Juan ; Béroujon, Solène ; Baraloto, Christophier | ||||
| Title | Resolving whole-plant economics from leaf, stem and root traits of 1467 Amazonian tree species | Type | Journal Article | ||
| Year | 2021 | Publication | Oikos | Abbreviated Journal | |
| Volume | 130 | Issue | 7 | Pages | 1193-1208 |
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| Abstract | It remains unclear how evolutionary and ecological processes have shaped the wide variety of plant life strategies, especially in highly diverse ecosystems like tropical forests. Some evidence suggests that species have diversified across a gradient of ecological strategies, with different plant tissues converging to optimize resource use across environmental gradients. Alternative hypotheses propose that species have diversified following independent selection on different tissues, resulting in a decoupling of trait syndromes across organs. To shed light on the subject, we assembled an unprecedented dataset combining 19 leaf, stem and root traits for 1467 tropical tree species inventoried across 71 0.1-ha plots spanning broad environmental gradients in French Guiana. Nearly 50% of the overall functional heterogeneity was expressed along four orthogonal dimensions, after accounting for phylogenetic dependences among species. The first dimension related to fine root functioning, while the second and third dimensions depicted two decoupled leaf economics spectra, and the fourth dimension encompassed a wood economics spectrum. Traits involved in orthogonal functional strategies, five leaf traits in particular but also trunk bark thickness, were consistently associated with a same gradient of soil texture and nutrient availability. Root traits did not show any significant association with edaphic variation, possibly because of the prevailing influence of other factors (mycorrhizal symbiosis, phylogenetic constraints). Our study emphasises the existence of multiple functional dimensions that allow tropical tree species to optimize their performance in a given environment, bringing new insights into the debate around the presence of a whole plant economic spectrum in tropical forest tree communities. It also emphasizes the key role that soil heterogeneity plays in shaping tree species assembly. The extent to which different organs are decoupled and respond to environmental gradients may also help to improve our predictions of species distribution changes in responses to habitat modification and environmental changes. | ||||
| Address | |||||
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| Publisher | Nordic Society OIKOS | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
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| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ | Serial | 1030 | ||
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| Author |
Vleminckx, J.; Schimann, H.; Decaëns, T.; Fichaux, M.; Vedel, V.; Jaouen, G.; Roy, M.; Lapied, E.; Engel, J.; Dourdain, A.; Petronelli, P.; Orivel, J.; Baraloto, C. | ||||
| Title | Coordinated community structure among trees, fungi and invertebrate groups in Amazonian rainforests | Type | Journal Article | ||
| Year | 2019 | Publication | Scientific Reports | Abbreviated Journal | Sci. Rep. |
| Volume | 9 | Issue | Pages | 11337 | |
| Keywords | |||||
| Abstract | Little is known regarding how trophic interactions shape community assembly in tropical forests. Here we assess multi-taxonomic community assembly rules using a rare standardized coordinated inventory comprising exhaustive surveys of five highly-diverse taxonomic groups exerting key ecological functions: trees, fungi, earthworms, ants and spiders. We sampled 36 1.9-ha plots from four remote locations in French Guiana including precise soil measurements, and we tested whether species turnover was coordinated among groups across geographic and edaphic gradients. All species group pairs exhibited significant compositional associations that were independent from soil conditions. For some of the pairs, associations were also partly explained by soil properties, especially soil phosphorus availability. Our study provides evidence for coordinated turnover among taxonomic groups beyond simple relationships with environmental factors, thereby refining our understanding regarding the nature of interactions occurring among these ecologically important groups. © 2019, The Author(s). | ||||
| Address | CIRAD, UMR Ecologie des Forêts de Guyane, Campus agronomique, BP 316, Kourou Cedex, 97379, France | ||||
| Corporate Author | Thesis | ||||
| Publisher | Nature Publishing Group | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 20452322 (Issn) | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ | Serial | 879 | ||
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| Author |
Vleminckx, J.; Bauman, D.; Demanet, M.; Hardy, O.J.; Doucet, J.-L.; Drouet, T. | ||||
| Title | Past human disturbances and soil fertility both influence the distribution of light-demanding tree species in a Central African tropical forest | Type | Journal Article | ||
| Year | 2020 | Publication | Journal of Vegetation Science | Abbreviated Journal | J. Veg. Sci. |
| Volume | 31 | Issue | 3 | Pages | 440-453 |
| Keywords | light-demanding species; moist tropical forests; past human disturbances; shade-bearer species; soil charcoal abundance; soil properties; tree community assemblages; wood-specific gravity; anthropogenic effect; forest canopy; forest ecosystem; shifting cultivation; soil fertility; soil property; tree; tropical forest; Cameroon | ||||
| Abstract | Questions: In vast areas of Central African forests, the upper canopy is presently dominated by light-demanding tree species. Here, we confront three hypotheses to explain this dominance: (a) these species have expanded their distribution because of widespread past slash-and-burn activities, as suggested by important charcoal amounts recorded in the soils of the region; (b) their abundance is rather explained by soil properties, as this guild establishes preferentially on favourable physico-chemical conditions for rapid growth; (c) soil properties have been substantially influenced by past human disturbances and those two effects cannot be disentangled. Location: Pallisco-CIFM logging concession, southeastern Cameroon (300,000 ha). Methods: We quantified soil charcoal abundance and measured ten soil variables at the basis of 60 target trees that belonged to a list of three long-living pioneer light-demanding (LLP) and four shade-bearer (SB) species. We identified all stems with a diameter at breast height (DBH) ≥ 20 cm within a distance of 15 m around each target tree. Species were characterised by their wood-specific gravity (WSG), which reflected their light requirement. Multiple regression models were used to quantify and test the relative effects of charcoal abundance and soil variables on the mean WSG of the 60 tree communities, as well as the abundance of three guilds: LLP, SB, and non-pioneer light demanders (NPLD). Results: The mean WSG was the only response variable significantly explained by soil variables and charcoal abundance combined. It was significantly negatively associated with soil calcium and Mg content and with charcoal abundance, with soil and charcoal influencing the mean WSG independently. Conclusion: Our study provides evidence that past human disturbances and soil fertility have independently promoted the establishment of light-demanding species in western Central African forests, thereby shedding light on tree community assembly rules in these ecosystems which remain considerably understudied compared to the tropical forests of other continents. © 2020 International Association for Vegetation Science | ||||
| Address | Forest is life, TERRA Teaching and Research Centre, Université de Liège – Gembloux Agro-Bio Tech, Gembloux, Belgium | ||||
| Corporate Author | Thesis | ||||
| Publisher | Wiley-Blackwell | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 11009233 (Issn) | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ | Serial | 970 | ||
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