期刊
NATURE COMMUNICATIONS
卷 5, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms5799
关键词
-
资金
- Major State Basic Research Development Program of China (973 Program) [2014CB954400, 2011CB403202]
- NSFC [31100326]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB15010401, XDB15010403]
- Office of the Vice President for Research at the University of Oklahoma
- Collaborative Innovation Center for Regional Environmental Quality
Higher aridity and more extreme rainfall events in drylands are predicted due to climate change. Yet, it is unclear how changing precipitation regimes may affect nitrogen (N) cycling, especially in areas with extremely high aridity. Here we investigate soil N isotopic values (delta N-15) along a 3,200 km aridity gradient and reveal a hump-shaped relationship between soil delta N-15 and aridity index (AI) with a threshold at AI = 0.32. Variations of foliar delta N-15, the abundance of nitrification and denitrification genes, and metabolic quotient along the gradient provide further evidence for the existence of this threshold. Data support the hypothesis that the increase of gaseous N loss is higher than the increase of net plant N accumulation with increasing AI below AI = 0.32, while the opposite is favoured above this threshold. Our results highlight the importance of N-cycling microbes in extremely dry areas and suggest different controlling factors of N-cycling on either side of the threshold.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据