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Amazon rainforest photosynthesis increases in response to atmospheric dryness
Science Advances ( IF 13.6 ) Pub Date : 2020-11-20 , DOI: 10.1126/sciadv.abb7232
J K Green 1, 2 , J Berry 3 , P Ciais 2 , Y Zhang 1, 4 , P Gentine 1, 5
Affiliation  

Earth system models predict that increases in atmospheric and soil dryness will reduce photosynthesis in the Amazon rainforest, with large implications for the global carbon cycle. Using in situ observations, solar-induced fluorescence, and nonlinear machine learning techniques, we show that, in reality, this is not necessarily the case: In many of the wettest parts of this region, photosynthesis and biomass tend to increase with increased atmospheric dryness, despite the associated reductions in canopy conductance to CO2. These results can be largely explained by changes in canopy properties, specifically, new leaves flushed during the dry season have higher photosynthetic capacity than the leaves they replace, compensating for the negative stomatal response to increased dryness. As atmospheric dryness will increase with climate change, our study highlights the importance of reframing how we represent the response of ecosystem photosynthesis to atmospheric dryness in very wet regions, to accurately quantify the land carbon sink.



中文翻译:

亚马逊雨林光合作用因大气干燥而增加

地球系统模型预测,大气和土壤干燥度的增加将减少亚马逊雨林的光合作用,对全球碳循环产生重大影响。使用原位观测、太阳诱导荧光和非线性机器学习技术,我们表明,实际上情况并非如此:在该地区许多最潮湿的地区,光合作用和生物量往往会随着大气干燥度的增加而增加,尽管冠层对 CO 2的传导性降低. 这些结果在很大程度上可以通过冠层特性的变化来解释,特别是在旱季冲洗的新叶比它们取代的叶子具有更高的光合能力,从而补偿了对增加的干燥的负气孔反应。由于大气干燥度将随着气候变化而增加,我们的研究强调了重新定义我们如何表示生态系统光合作用对非常潮湿地区大气干燥度的响应的重要性,以准确量化陆地碳汇。

更新日期:2020-11-21
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