气候变化领域集成服务门户(CCPortal): Increasing sensitivity of dryland vegetation greenness to precipitation due to rising atmospheric CO2

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DOI	10.1038/s41467-022-32631-3
	Increasing sensitivity of dryland vegetation greenness to precipitation due to rising atmospheric CO2
	Zhang, Yao; Gentine, Pierre; Luo, Xiangzhong; Lian, Xu; Liu, Yanlan; Zhou, Sha; Michalak, Anna M.; Sun, Wu; Fisher, Joshua B.; Piao, Shilong; Keenan, Trevor F.
发表日期	2022
EISSN	2041-1723
卷号	13 期号:1
英文摘要	Water availability plays a critical role in shaping terrestrial ecosystems, particularly in low- and mid-latitude regions. The sensitivity of vegetation growth to precipitation strongly regulates global vegetation dynamics and their responses to drought, yet sensitivity changes in response to climate change remain poorly understood. Here we use long-term satellite observations combined with a dynamic statistical learning approach to examine changes in the sensitivity of vegetation greenness to precipitation over the past four decades. We observe a robust increase in precipitation sensitivity (0.624% yr(-1)) for drylands, and a decrease (-0.618% yr(-1)) for wet regions. Using model simulations, we show that the contrasting trends between dry and wet regions are caused by elevated atmospheric CO2 (eCO(2)). eCO(2) universally decreases the precipitation sensitivity by reducing leaf-level transpiration, particularly in wet regions. However, in drylands, this leaf-level transpiration reduction is overridden at the canopy scale by a large proportional increase in leaf area. The increased sensitivity for global drylands implies a potential decrease in ecosystem stability and greater impacts of droughts in these vulnerable ecosystems under continued global change. Changes in vegetation responses to precipitation may be hydroclimate dependent. Here the authors reveal contrasting trends of vegetation sensitivity to precipitation in drylands vs. wetter ecosystems over the last 4 decades and identify increased CO2 as a major contributing factor.
语种	英语
WOS研究方向	Multidisciplinary Sciences
WOS类目	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000842533800011
来源期刊	NATURE COMMUNICATIONS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/280689
作者单位	Peking University; United States Department of Energy (DOE); Lawrence Berkeley National Laboratory; University of California System; University of California Berkeley; Columbia University; National University of Singapore; University System of Ohio; Ohio State University; Beijing Normal University; Carnegie Institution for Science; Chapman University System; Chapman University; Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS
推荐引用方式 GB/T 7714	Zhang, Yao,Gentine, Pierre,Luo, Xiangzhong,et al. Increasing sensitivity of dryland vegetation greenness to precipitation due to rising atmospheric CO2[J]. 中国科学院青藏高原研究所,2022,13(1).
APA	Zhang, Yao.,Gentine, Pierre.,Luo, Xiangzhong.,Lian, Xu.,Liu, Yanlan.,...&Keenan, Trevor F..(2022).Increasing sensitivity of dryland vegetation greenness to precipitation due to rising atmospheric CO2.NATURE COMMUNICATIONS,13(1).
MLA	Zhang, Yao,et al."Increasing sensitivity of dryland vegetation greenness to precipitation due to rising atmospheric CO2".NATURE COMMUNICATIONS 13.1(2022).