干旱区生态环境知识资源中心(Arid): Soil moisture dominates the variation of gross primary productivity during hot drought in drylands

Arid

DOI	10.1016/j.scitotenv.2023.165686
	Soil moisture dominates the variation of gross primary productivity during hot drought in drylands
	Qiu, Ruonan; Han, Ge; Li, Siwei; Tian, Feng; Ma, Xin; Gong, Wei
通讯作者	Han, G ; Li, SW
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2023
卷号	899
英文摘要	The frequency and severity of hot drought will increase in the future due to impact of climate change and human activities, threatening the sustainability of terrestrial ecosystems and human societies. Hot drought is a typical type of drought event, high vapor pressure deficit (VPD) and low soil moisture (SM) are its main characteristics of hot drought, with increasing water stress on vegetation and exacerbating hydrological drought and ecosystem risks. However, our understanding of the effects of high VPD and low SM on vegetation productivity is limited, because these two variables are strongly coupled and influenced by other climatic drivers. The southwestern United States experienced one of the most severe hot drought events on record in 2020. In this study, we used SM and gross primary productivity (GPP) datasets from Soil Moisture Active and Passive (SMAP), as well as VPD and other meteorological datasets from gridMET. We decoupled the effects of different meteorological factors on GPP at monthly and daily scales using partial correlation analysis, partial least squares regression, and binning methods. We found that SM anomalies contribute more to GPP anomalies than VPD anomalies at monthly and daily scales. Especially at the daily scale, as the decoupled SM anomalies increased, the GPP anomalies increased. However, there is no significant change in GPP anomalies as VPD increases. For all the vegetation types and arid zones, SM dominated the variation in GPP, followed by VPD or maximum temperature. At the flux tower scale, decoupled soil water content (SWC) also dominated changes in GPP, compared to VPD. In the next century, hot drought will occur frequently in dryland regions, where GPP is one of the highest uncertainties in terrestrial ecosystems. Our study has important implications for identifying the strong coupling of meteorological factors and their impact on vegetation under climate change.
英文关键词	Hot drought SMAP Gross primary production Soil moisture Vapor pressure deficit Decouple
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001050175600001
WOS关键词	ATMOSPHERIC DEMAND ; ECOSYSTEM WATER ; VARIABILITY ; GRASSLAND ; MORTALITY ; RESPONSES ; PATTERNS ; SURVIVAL ; IMPACTS
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/398546
推荐引用方式 GB/T 7714	Qiu, Ruonan,Han, Ge,Li, Siwei,et al. Soil moisture dominates the variation of gross primary productivity during hot drought in drylands[J],2023,899.
APA	Qiu, Ruonan,Han, Ge,Li, Siwei,Tian, Feng,Ma, Xin,&Gong, Wei.(2023).Soil moisture dominates the variation of gross primary productivity during hot drought in drylands.SCIENCE OF THE TOTAL ENVIRONMENT,899.
MLA	Qiu, Ruonan,et al."Soil moisture dominates the variation of gross primary productivity during hot drought in drylands".SCIENCE OF THE TOTAL ENVIRONMENT 899(2023).