Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Biogeosciences, 12, 5583-5596, 2015
https://doi.org/10.5194/bg-12-5583-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
01 Oct 2015
Identifying climatic drivers of tropical forest dynamics
M. Aubry-Kientz1, V. Rossi2,3,4, F. Wagner2,5, and B. Hérault2 1Université des Antilles et de la Guyane, UMR Ecologie des Forêts de Guyane, Campus agronomique de Kourou, Kourou, France
2CIRAD, UMR Ecologie des Forêts de Guyane, Campus agronomique de Kourou, Kourou, France
3CIRAD, UPR Bsef, Montpellier, France
4Université de Yaoundé I, UMMISCO (UMI209), BP337, Yaoundé, Cameroon
5Remote sensing division, National Institute for Space Research-INPE, São José dos Campos, SP, Brazil
Abstract. In the context of climate change, identifying and then predicting the impacts of climatic drivers on tropical forest dynamics is becoming a matter of urgency. To look at these climate impacts, we used a coupled model of tropical tree growth and mortality, calibrated with forest dynamic data from the 20-year study site of Paracou, French Guiana, in order to introduce and test a set of climatic variables. Three major climatic drivers were identified through the variable selection procedure: drought, water saturation and temperature. Drought decreased annual growth and mortality rates, high precipitation increased mortality rates and high temperature decreased growth. Interactions between key functional traits, stature and climatic variables were investigated, showing best resistance to drought for trees with high wood density and for trees with small current diameters. Our results highlighted strong long-term impacts of climate variables on tropical forest dynamics, suggesting potential deep impacts of climate changes during the next century.

Citation: Aubry-Kientz, M., Rossi, V., Wagner, F., and Hérault, B.: Identifying climatic drivers of tropical forest dynamics, Biogeosciences, 12, 5583-5596, https://doi.org/10.5194/bg-12-5583-2015, 2015.
Publications Copernicus
Download
Short summary
We used a forest dynamic model, calibrated with data from the 20-year study site of Paracou, French Guiana, to test a set of climatic variables on tree growth and mortality probabilities. Severe droughts decreased annual growth and mortality rates, high precipitation increased mortality rates and high temperature decreased tree growth. Best resistance to drought was found for trees with high wood density and for trees with small current diameters.
We used a forest dynamic model, calibrated with data from the 20-year study site of Paracou,...
Share