干旱区生态环境知识资源中心(Arid): Threshold of vapour-pressure deficit constraint on light use efficiency varied with soil water content

Arid

DOI	10.1002/eco.2305
	Threshold of vapour-pressure deficit constraint on light use efficiency varied with soil water content
	Gao, Dexin; Wang, Shuai; Li, Zidong; Wei, Fangli; Chen, Peng; Song, Shuang; Wang, Yaping; Wang, Lixin; Fu, Bojie
通讯作者	Wang, S (corresponding author), Beijing Normal Univ, Fac Geog Sci, Beijing 100875, Peoples R China.
来源期刊	ECOHYDROLOGY
ISSN	1936-0584
EISSN	1936-0592
出版年	2021-05
英文摘要	Understanding the constraints on light-use efficiency (LUE) induced by high evaporative water demand (vapour-pressure deficit; VPD) and soil water stress (soil moisture content; SMC) is crucial for understanding and simulating vegetation productivity, particularly in the arid and semi-arid regions. However, the relative impacts of VPD and SMC on LUE are unclear, as we lack a mechanistic understanding of impacts and their interactions. In this study, we quantified the relative roles of VPD and SMC in limiting LUE and analysed the interactions among VPD, SMC and LUE using data from CO2 and water flux stations and weather stations along a climatic gradient in the Heihe River Basin, China. We found a threshold of VPD constraint on LUE; above the threshold, LUE decreased at only 3.6% to 23.1% of the rate below the threshold. As SMC decreased, however, the VPD threshold increased, and the reduction of LUE caused by VPD decreased significantly, which is more than half of that in moister regions. Therefore, both VPD and SMC played essential roles in LUE limitation caused by water stress. A threshold also existed for heat flux and the correlation between SMC and LUE; the strength of the correlation first decreased and then increased with increasing VPD. Our results clarified the relative impacts of VPD and SMC on LUE, and can improve simulation and prediction of plant productivity.
英文关键词	carbon simulation uncertainty dryland LUE SMC threshold VPD
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000651505100001
WOS关键词	GAP FILLING STRATEGIES ; EDDY-COVARIANCE ; RESPONSES ; SPHAGNUM ; MOISTURE ; CLIMATE ; DEMAND
WOS类目	Ecology ; Environmental Sciences ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/352124
作者单位	[Gao, Dexin; Wang, Shuai; Li, Zidong; Chen, Peng; Song, Shuang; Wang, Yaping; Fu, Bojie] Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing, Peoples R China; [Wei, Fangli; Fu, Bojie] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing, Peoples R China; [Wang, Lixin] Indiana Univ Purdue Univ, Dept Earth Sci, Indianapolis, IN 46202 USA
推荐引用方式 GB/T 7714	Gao, Dexin,Wang, Shuai,Li, Zidong,et al. Threshold of vapour-pressure deficit constraint on light use efficiency varied with soil water content[J]. 北京师范大学,2021.
APA	Gao, Dexin.,Wang, Shuai.,Li, Zidong.,Wei, Fangli.,Chen, Peng.,...&Fu, Bojie.(2021).Threshold of vapour-pressure deficit constraint on light use efficiency varied with soil water content.ECOHYDROLOGY.
MLA	Gao, Dexin,et al."Threshold of vapour-pressure deficit constraint on light use efficiency varied with soil water content".ECOHYDROLOGY (2021).