干旱区生态环境知识资源中心(Arid): Vegetation responses to ecological water delivery and prolonged droughts in an artificial desert oasis, Northwestern China

Arid

DOI	10.1016/j.ecoinf.2023.102284
	Vegetation responses to ecological water delivery and prolonged droughts in an artificial desert oasis, Northwestern China
	Wang, Xu-dong; Xu, Hao-jie; Pan, Yan-xia; Fu, Gui-quan; Chen, Tian; Qi, Xiao-lian; Yang, Xue-mei
通讯作者	Xu, HJ
来源期刊	ECOLOGICAL INFORMATICS
ISSN	1574-9541
EISSN	1878-0512
出版年	2023
卷号	77
英文摘要	Irrational water usage in the middle reaches of inland rivers is detrimental to downstream oases, and the Qingtu Oasis is a typical downstream oasis that is degraded by water resource scarcity. The Qingtu Lake ecological water diversion project (EWDP) has restored the oasis, but the response pattern of different vegetation communities to environmental water and the dominant drivers of vegetation dynamics are not clear. Here, based on ground and satellite observations, this study investigated the spatial and temporal patterns of vegetation distribution and growth in the Qingtu Oasis from 2010 to 2022, and the reasons for the interannual variability in vegetation growth were also explained. The results showed that temporal variations in the distribution area of Phragmites australis (PA) followed a logistic curve after the EWDP, which increased rapidly from 2010 to 2019 and stabilized afterward. Meanwhile, the distribution area of Nitraria tangutorum (NT) presented a linear increase during the study period, with a 121.2% increase. Due to water inundation, the central region was occupied by PA communities, while NT communities moved to the edge. The spatial connectivity of PA patches increased significantly in contrast to the overall fragmentation tendency of NT patches in 2010-2022. The oasis tended to be homogenized and aggregated according to the morphological spatial pattern analysis, along with the landscape diversity and contagion indices. Enhanced vegetation growth, as indicated by the normalized difference vegetation index (NDVI), was observed in 76.1% of the vegetated lands, and the NDVI increasing rate was high near the canal. Using the random forest model, this study found that changes in groundwater depth were the most important driver of NDVI variability. The following influencing factors were atmospheric CO2 concentration, water inundation area and water delivery amount. In the absence of large increases in water delivery amount, oasis vegetation growth was susceptible to prolonged droughts. This study uncovers a nonlinear response of different vegetation communities to climate change and the EWDP in the downstream region of arid endorheic basins and identifies meteorological droughts as a key factor that should be fully considered in water delivery strategies. These findings lay a solid foundation for managing oasis restoration and water resource allocation in arid inland river basins.
英文关键词	Water delivery Oasisfication Landscape structure Vegetation vigor Factor analysis
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001073415600001
WOS关键词	SHIYANG RIVER-BASIN ; LOWER REACHES ; SEMIARID REGIONS ; GROUNDWATER ; PATTERNS ; GROWTH ; SUSTAINABILITY ; CONNECTIVITY ; ENVIRONMENT ; DYNAMICS
WOS类目	Ecology
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/2XILL650/395992
推荐引用方式 GB/T 7714	Wang, Xu-dong,Xu, Hao-jie,Pan, Yan-xia,et al. Vegetation responses to ecological water delivery and prolonged droughts in an artificial desert oasis, Northwestern China[J],2023,77.
APA	Wang, Xu-dong.,Xu, Hao-jie.,Pan, Yan-xia.,Fu, Gui-quan.,Chen, Tian.,...&Yang, Xue-mei.(2023).Vegetation responses to ecological water delivery and prolonged droughts in an artificial desert oasis, Northwestern China.ECOLOGICAL INFORMATICS,77.
MLA	Wang, Xu-dong,et al."Vegetation responses to ecological water delivery and prolonged droughts in an artificial desert oasis, Northwestern China".ECOLOGICAL INFORMATICS 77(2023).