The response of tropical rainforests to drought—lessons from recent research and future prospects

Damien Bonal (1) , Benoît Burban (2) , Clément Stahl (2, 3) , Fabien Wagner (4) , Bruno Hérault (2)

1 EEF - Ecologie et Ecophysiologie Forestières [devient SILVA en 2018]
2 UMR ECOFOG - Ecologie des forêts de Guyane
3 UA - University of Antwerp
4 INPE - National Institute for Space Research [Sao José dos Campos] = Instituto Nacional de Pesquisas Espaciais

Key message We review the recent findings on the influence of drought on tree mortality, growth or ecosystem functioning in tropical rainforests. Drought plays a major role in shaping tropical rainforests and the response mechanisms are highly diverse and complex. The numerous gaps identified here require the international scientific community to combine efforts in order to conduct comprehensive studies in tropical rainforests on the three continents. These results are essential to simulate the future of these ecosystems under diverse climate scenarios and to predict the future of the global earth carbon balance.[br/] Context Tropical rainforest ecosystems are characterized by high annual rainfall. Nevertheless, rainfall regularly fluctuates during the year and seasonal soil droughts do occur. Over the past decades, a number of extreme droughts have hit tropical rainforests, not only in Amazonia but also in Asia and Africa. The influence of drought events on tree mortality and growth or on ecosystem functioning (carbon and water fluxes) in tropical rainforest ecosystems has been studied intensively, but the response mechanisms are complex.[br/] Aims Herein, we review the recent findings related to the response of tropical forest ecosystems to seasonal and extreme droughts and the current knowledge about the future of these ecosystems.[br/] Results This review emphasizes the progress made over recent years and the importance of the studies conducted under extreme drought conditions or in through-fall exclusion experiments in understanding the response of these ecosystems. It also points to the great diversity and complexity of the response of tropical rainforest ecosystems to drought.[br/] Conclusion The numerous gaps identified here require the international scientific community to combine efforts in order to conduct comprehensive studies in tropical forest regions. These results are essential to simulate the future of these ecosystems under diverse climate scenarios and to predict the future of the global earth carbon balance.

Mots clés: carbon; climate; drought; global change; growth; mortality; tropical; water

Domaines: Sciences du Vivant [q-bio]

Damien Bonal, Benoît Burban, Clément Stahl, Fabien Wagner, Bruno Hérault. The response of tropical rainforests to drought—lessons from recent research and future prospects. Annals of Forest Science, 2015, First online: 25 September 2015 (1), pp.1-18. ⟨10.1007/s13595-015-0522-5⟩. ⟨hal-01269438⟩