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Amazonian rain forests and drought: response and vulnerability.

Natural variation in moisture availability affects the productivity of tropical ecosystems more profoundly than any other climatic variable. As a result, drought is perhaps the most important climatic threat to tropical forests. Climate-change scenarios for the 21st century have suggested decreased soilmoisture availability in certain regions of the world (Bates et al., 2008). Notably, the rain forests of Amazonia have been considered to be at particular risk, especially when possible climate impacts are examined alongside an increased incidence of land-use change (Scholze et al., 2006; SoaresFilho et al., 2006; Malhi et al., 2008).