期刊
PLOS ONE
卷 12, 期 7, 页码 -出版社
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0180932
关键词
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资金
- Fapesp (Fundacao de Amparo a Pesquisa do Estado de Sao Paulo) [processo 13/14520-6, processo 15/50484-0, processo 16/17652-9, processo 2016/03397-7]
- FAPESP [50533-5]
- CNPQ [304425/2013-3]
- Academy of Finland [266393]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [PVE 401025/2014-4]
- NASA Program Science from Terra and Aqua
- Academy of Finland (AKA) [266393, 266393] Funding Source: Academy of Finland (AKA)
Our limited understanding of the climate controls on tropical forest seasonality is one of the biggest sources of uncertainty in modeling climate change impacts on terrestrial ecosystems. Combining leaf production, litterfall and climate observations from satellite and ground data in the Amazon forest, we show that seasonal variation in leaf production is largely triggered by climate signals, specifically, insolation increase (70.4% of the total area) and precipitation increase (29.6%). Increase of insolation drives leaf growth in the absence of water limitation. For these non-water-limited forests, the simultaneous leaf flush occurs in a sufficient proportion of the trees to be observed from space. While tropical cycles are generally defined in terms of dry or wet season, we show that for a large part of Amazonia the increase in insolation triggers the visible progress of leaf growth, just like during spring in temperate forests. The dependence of leaf growth initiation on climate seasonality may result in a higher sensitivity of these ecosystems to changes in climate than previously thought.
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