干旱区生态环境知识资源中心(Arid): Spatial responses of ecosystem water-use efficiency to hydrothermal and vegetative gradients in alpine grassland ecosystem in drylands

Arid

DOI	10.1016/j.ecolind.2022.109064
	Spatial responses of ecosystem water-use efficiency to hydrothermal and vegetative gradients in alpine grassland ecosystem in drylands
	Liu, Xiaoyi; Liu, Chao; Fan, Bihang; Li, Longguo; Tan, Bo; Jin, Zhongwu; Lu, Heng; Liu, Tiegang
通讯作者	Liu, TG
来源期刊	ECOLOGICAL INDICATORS
ISSN	1470-160X
EISSN	1872-7034
出版年	2022
卷号	141
英文摘要	The carbon-water cycle is critical to ecosystem function and sustainability in dryland region. Ecosystem water use efficiency (WUE) is an important indicator reflecting the interaction between carbon and water, and investigating its spatial responses to hydrothermal and vegetative gradients is vital to understand the underlying mechanism of carbon-water coupling. The source region of the Yellow River (SRYR) is a typical alpine grassland ecosystem in drylands characterized by cold and arid climate, which is ecologically fragile and sensitive to environmental factors. In this study, we investigated the spatial variations of ecosystem WUE in the SRYR during 2000-2014 and examined its underlying drivers. The mean annual WUE showed significantly increasing trends along hydrothermal and vegetative gradients from semi-arid zone (SA) to dry sub-humid zone (DSH), with the average value of 0.59 +/- 0.35 gC kg-1 H2O. The spatial variations of WUE were mainly controlled by gross primary productivity (GPP) rather than evapotranspiration (ET). Compared to precipitation (P), temperature (Ta) better explained the spatial variations of WUE. And a temperature threshold of 0 degrees C was found, which indicated a shift of sensitivity of WUE to thermal conditions from permafrost to seasonally frozen ground due to the effects of low temperature on photosynthetic process in alpine grassland ecosystem. The responses of WUE to LAI gradients reflected the indirect effects of hydrothermal conditions on WUE by altering LAI. This study improves our understanding of the spatial responses of the regional carbon and water interactions to environmental conditions.
英文关键词	Alpine grassland ecosystem Water-use efficiency Sensitivity Gradient Threshold
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000818665800007
WOS关键词	YELLOW-RIVER ; CLIMATE-CHANGE ; CARBON FLUXES ; SOURCE REGION ; EVAPOTRANSPIRATION PRODUCTS ; TERRESTRIAL ECOSYSTEMS ; HEADWATER REGION ; TIBETAN PLATEAU ; LOESS PLATEAU ; CHINA
WOS类目	Biodiversity Conservation ; Environmental Sciences
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/392328
推荐引用方式 GB/T 7714	Liu, Xiaoyi,Liu, Chao,Fan, Bihang,et al. Spatial responses of ecosystem water-use efficiency to hydrothermal and vegetative gradients in alpine grassland ecosystem in drylands[J],2022,141.
APA	Liu, Xiaoyi.,Liu, Chao.,Fan, Bihang.,Li, Longguo.,Tan, Bo.,...&Liu, Tiegang.(2022).Spatial responses of ecosystem water-use efficiency to hydrothermal and vegetative gradients in alpine grassland ecosystem in drylands.ECOLOGICAL INDICATORS,141.
MLA	Liu, Xiaoyi,et al."Spatial responses of ecosystem water-use efficiency to hydrothermal and vegetative gradients in alpine grassland ecosystem in drylands".ECOLOGICAL INDICATORS 141(2022).