干旱区生态环境知识资源中心(Arid): Increasing evapotranspiration decouples the positive correlation between vegetation cover and warming in the Tibetan plateau

Arid

DOI	10.3389/fpls.2022.974745
	Increasing evapotranspiration decouples the positive correlation between vegetation cover and warming in the Tibetan plateau
	Dai, Xue; Yu, Zhongbo; Matheny, Ashley M.; Zhou, Wei; Xia, Jun
通讯作者	Dai, X ; Yu, ZB
来源期刊	FRONTIERS IN PLANT SCIENCE
ISSN	1664-462X
出版年	2022
卷号	13
英文摘要	Plant growth generally responds positively to an increase in ambient temperature. Hence, most Earth system models project a continuous increase in vegetation cover in the future due to elevated temperatures. Over the last 40 years, a considerable warming trend has affected the alpine ecosystem across the Tibetan Plateau. However, we found vegetation growth in the moderately vegetated areas of the plateau were negatively related to the warming temperatures, thus resulting in a significant degradation of the vegetative cover (LAI: slope = -0.0026 per year, p < 0.05). The underlying mechanisms that caused the decoupling of the relationship between vegetation growth and warming in the region were elaborated with the analysis of water and energy variables in the ecosystem. Results indicate that high temperatures stimulated evapotranspiration and increased the water consumption of the ecosystem (with an influence coefficient of 0.34) in these degrading areas, significantly reducing water availability (with an influence coefficient of -0.68) and limiting vegetation growth. Moreover, the negative warming effect on vegetation was only observed in the moderately vegetated areas, as evapotranspiration there predominantly occupied a larger proportion of available water (compared to the wet and highly vegetated areas) and resulted in a greater increase in total water consumption in a warmer condition (compared to dry areas with lower levels of vegetation cover). These findings highlight the risk of vegetation degradation in semi-arid areas, with the degree of vulnerability depending on the level of vegetation cover. Furthermore, results demonstrate the central role of evapotranspiration in regulating water stress intensity on vegetation under elevated temperatures.
英文关键词	vegetation cover climate change evapotranspiration Tibetan Plateau decoupling
类型	Article
语种	英语
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000869647100001
WOS关键词	STRUCTURAL EQUATION MODELS ; CLIMATE-CHANGE ; TEMPERATURE ; CO2 ; PHOTOSYNTHESIS ; PRODUCTIVITY ; REANALYSIS ; RESPONSES ; ECOSYSTEM ; WATER
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/392825
推荐引用方式 GB/T 7714	Dai, Xue,Yu, Zhongbo,Matheny, Ashley M.,et al. Increasing evapotranspiration decouples the positive correlation between vegetation cover and warming in the Tibetan plateau[J],2022,13.
APA	Dai, Xue,Yu, Zhongbo,Matheny, Ashley M.,Zhou, Wei,&Xia, Jun.(2022).Increasing evapotranspiration decouples the positive correlation between vegetation cover and warming in the Tibetan plateau.FRONTIERS IN PLANT SCIENCE,13.
MLA	Dai, Xue,et al."Increasing evapotranspiration decouples the positive correlation between vegetation cover and warming in the Tibetan plateau".FRONTIERS IN PLANT SCIENCE 13(2022).