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2014年2月6日 Nature
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; A7 u5 O' p2 Q! C: @Sunrise with Brazil nut tree in Senador Guiomard, Acre, Brazil. Our understanding of the sensitivity of the terrestrial carbon budget to climate anomalies is based largely on modelling and small-scale ecosystem studies and remains uncertain. That means that although the fate of the vast amounts of carbon stored as Amazon rainforest biomass is crucial to future climate trends it is not clear whether the Amazon will remain a carbon sink or become a source — and a driver of climate change. A new analysis of seasonal and annual carbon balances based on carbon dioxide and monoxide measurements for anomalously dry and wet years suggests that water availability has an important role in determining the carbon balance in the Amazon basin. During 2010, drought reduced plant production and limited the amount of carbon that could be stored in vegetation; at the same time large amounts of carbon were released by fire. The region was carbon neutral during the wet year, 2011, because of reduced carbon loss through fires and increased carbon uptake by vegetation. Cover: P&R Fotos/AGR Fotostock & robertharding.com% X! ?, Q; P g/ U! n+ H
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发表于 2014-2-11 00:10
