干旱区生态环境知识资源中心(Arid): Evaluating the cumulative and time-lag effects of vegetation response to drought in Central Asia under changing environments

Arid

DOI	10.1016/j.jhydrol.2023.130455
	Evaluating the cumulative and time-lag effects of vegetation response to drought in Central Asia under changing environments
	Xu, Shixian; Wang, Yonghui; Liu, Yuan; Li, Jiaxin; Qian, Kaixuan; Yang, Xiuyun; Ma, Xiaofei
通讯作者	Ma, XF
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2023
卷号	627
英文摘要	Central Asia (CA) is an arid region sensitive to climate change, and with the increase in drought events due to global warming, droughts are posing more severe threats to the vegetation in CA. However, the response of vegetation in CA to the cumulative and time-lag effects of prolonged drought remains unclear. This has limited our understanding of the mechanisms by which vegetation responds to meteorological drought in arid regions. To clarify the response of vegetation to drought in CA, this study analyzed the effects of drought and meteorological factors on vegetation growth dynamics. The extent of vegetation response to the cumulative and timelag effects from 2001 to 2020 was evaluated using three satellite-derived vegetation indices (NDVI, EVI, NIRv) and the solar-induced chlorophyll fluorescence (SIF) and standardized precipitation evapotranspiration index (SPEI). We used the Copula-Bayes conditional probability method to assess the drought thresholds for vegetation under two scenarios: mild and severe losses. The effects of soil moisture (SM) and vapor pressure deficit (VPD) on vegetation dynamics were analyzed based on an improved partial wavelet coherence (PWC). The results show that the average response time of vegetation to the cumulative and lagged effects of drought was mostly concentrated within 4-6 months, and the lagged effect was stronger than the cumulative effect. The vegetation response to drought is nonlinear along the precipitation gradient. The SPEI values for triggering mild vegetation loss (below the 40th percentile) drought threshold range from -0.7 to -1.0, while the SPEI values for triggering severe vegetation loss (below the 10th percentile) drought threshold range from -2.0 to -2.5. The SM was the main driver affecting vegetation dynamics. This study provides deeper insight into the response of vegetation to drought in the arid zone of CA, which will further provide theoretical support for addressing global climate change and extreme drought events.
英文关键词	Cumulative effect Time-lag effect Response time Dry lands Drought thresholds
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001150203900001
WOS关键词	STANDARDIZED PRECIPITATION INDEX ; INDUCED CHLOROPHYLL FLUORESCENCE ; GROSS PRIMARY PRODUCTION ; WAVELET COHERENCE ; CARBON ; WATER ; PLANT ; PHOTOSYNTHESIS ; ECOSYSTEMS ; DYNAMICS
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397431
推荐引用方式 GB/T 7714	Xu, Shixian,Wang, Yonghui,Liu, Yuan,et al. Evaluating the cumulative and time-lag effects of vegetation response to drought in Central Asia under changing environments[J],2023,627.
APA	Xu, Shixian.,Wang, Yonghui.,Liu, Yuan.,Li, Jiaxin.,Qian, Kaixuan.,...&Ma, Xiaofei.(2023).Evaluating the cumulative and time-lag effects of vegetation response to drought in Central Asia under changing environments.JOURNAL OF HYDROLOGY,627.
MLA	Xu, Shixian,et al."Evaluating the cumulative and time-lag effects of vegetation response to drought in Central Asia under changing environments".JOURNAL OF HYDROLOGY 627(2023).