干旱区生态环境知识资源中心(Arid): Quantifying the drought sensitivity of grassland under different climate zones in Northwest China

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DOI	10.1016/j.scitotenv.2023.168688
	Quantifying the drought sensitivity of grassland under different climate zones in Northwest China
	Su, Jingxuan; Fan, Liangxin; Yuan, Zhanliang; Wang, Zhen; Wang, Zhijun
通讯作者	Fan, LX
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2024
卷号	910
英文摘要	Grassland is essential for maintaining the stability and functionality of terrestrial ecosystems. Although previous research has explored how grassland responds to drought, the drought sensitivity of grassland (DSG) across climate zones and aridity gradients remains uncertain. In this study, we conducted a comprehensive investigation spanning 1982 to 2015 in Northwest China. To assess the time-cumulative effect (TCE) and the time-lag effect (TLE) of drought on grassland, we employed Spearman rank correlation analysis, utilizing long-term datasets of the normalized difference vegetation index (NDVI) and the standardized precipitation evapotranspiration index (SPEI). This analysis allowed us to quantify the DSG in the region and further examine its variations across climate zones and aridity gradient. Our results revealed that 81.2 % and 99.7 % of the grassland in Northwest China was influenced by the TCE and TLE of drought, respectively, with 38.2 % and 60.9 % of these effects being statistically significant (p < 0.05). The mean accumulated and lagged timescales of drought on grassland were 7.89 and 9.41 months, respectively. Remarkably, the highest DSG was observed in the semi-arid zone (0.58), followed by the arid (0.54), sub-humid (0.51), and humid (0.44) zones. Furthermore, we identified significant nonlinear variation patterns of DSG along the aridity gradient, characterized by several discernible trend breaks. These findings contribute to our understanding of the impacts of drought on vegetation, particularly in ecologically fragile regions.
英文关键词	SPEI Grassland NDVI Time-cumulative effect Time-lag effect Drought sensitivity Northwest China
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001126719000001
WOS关键词	VEGETATION RESPONSES ; TIME-SCALES ; NORTHERN ; INDEX ; VARIABILITY ; MOUNTAINS ; DYNAMICS ; HEAT
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/2XILL650/405439
推荐引用方式 GB/T 7714	Su, Jingxuan,Fan, Liangxin,Yuan, Zhanliang,et al. Quantifying the drought sensitivity of grassland under different climate zones in Northwest China[J],2024,910.
APA	Su, Jingxuan,Fan, Liangxin,Yuan, Zhanliang,Wang, Zhen,&Wang, Zhijun.(2024).Quantifying the drought sensitivity of grassland under different climate zones in Northwest China.SCIENCE OF THE TOTAL ENVIRONMENT,910.
MLA	Su, Jingxuan,et al."Quantifying the drought sensitivity of grassland under different climate zones in Northwest China".SCIENCE OF THE TOTAL ENVIRONMENT 910(2024).