气候变化领域集成服务门户(CCPortal): Critical thresholds for nonlinear responses of ecosystem water use efficiency to drought

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DOI	10.1016/j.scitotenv.2024.170713
	Critical thresholds for nonlinear responses of ecosystem water use efficiency to drought
	Hu, Ying; Wei, Fangli; Wang, Shuai; Zhang, Wenmin; Fensholt, Rasmus; Xiao, Xiangming; Fu, Bojie
发表日期	2024
ISSN	0048-9697
EISSN	1879-1026
起始页码	918
卷号	918
英文摘要	Climate change is expected to lead to greater variability in precipitation and drought in different regions. However, the responses of ecosystem carbon and water cycles (i.e., water use efficiency, WUE) to different levels of drought stress are not fully understood. Here, we examined the relationship between WUE and precipitation anomalies and identified the critical drought threshold (Dr(CW)) above which WUE showed substantial decrease. The results revealed that 85.56 % of the study area had nonlinear WUE responses to drought stress; that is, the WUE decreased sustainably and steeply when the precipitation deficit exceeded the Dr(CW). Dr(CW) indicates inflection points for changing ecosystem responses from relatively resistant to vulnerable to drought stress, thus providing an instructive early warning for intensifying suppressive impacts on vegetation growth. Additionally, Dr(CW) varies across aridity gradients and among vegetation types. Based on the Dr(CW) at the pixel level, the future eco-drought is projected to increase in >67 % of the study area under both the SSP2&RCP4.5 and SSP5&RCP8.5 scenarios by the end of the 21st century. Our study elucidates the response of the ecosystem function to drought and supports the development of accurate ecosystem adaptation policies for future drought stress.
英文关键词	Drought; Water use efficiency; Response trajectory; Critical thresholds; Ecological risks
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:001184971300001
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/294678
作者单位	Chinese Academy of Sciences; Research Center for Eco-Environmental Sciences (RCEES); Chinese Academy of Sciences; Institute of Geographic Sciences & Natural Resources Research, CAS; Beijing Normal University; University of Copenhagen; University of Oklahoma System; University of Oklahoma - Norman
推荐引用方式 GB/T 7714	Hu, Ying,Wei, Fangli,Wang, Shuai,et al. Critical thresholds for nonlinear responses of ecosystem water use efficiency to drought[J],2024,918.
APA	Hu, Ying.,Wei, Fangli.,Wang, Shuai.,Zhang, Wenmin.,Fensholt, Rasmus.,...&Fu, Bojie.(2024).Critical thresholds for nonlinear responses of ecosystem water use efficiency to drought.SCIENCE OF THE TOTAL ENVIRONMENT,918.
MLA	Hu, Ying,et al."Critical thresholds for nonlinear responses of ecosystem water use efficiency to drought".SCIENCE OF THE TOTAL ENVIRONMENT 918(2024).