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DOI	10.1016/j.ecolind.2021.107804
	A novel index for ecological drought monitoring based on ecological water deficit
	Jiang, Tianliang; Su, Xiaoling; Singh, Vijay P.; Zhang, Gengxi
通讯作者	Su, XL (corresponding author), Northwest A&F Univ, Coll Water Resources & Architectural Engn, Weihui Rd 23, Yangling 712100, Shaanxi, Peoples R China.
来源期刊	ECOLOGICAL INDICATORS
ISSN	1470-160X
EISSN	1872-7034
出版年	2021
卷号	129
英文摘要	Although the concept of ecological drought was first defined by the Science for Nature and People Partnership (SNAPP) in 2016, there remains no widely accepted ecological drought monitoring index. Therefore, this study constructed a new ecological drought index, the standardized ecological water deficit index (SEWDI). The SEWDI is based on the difference between ecological water requirement and consumption, referred to as the standardized precipitation index (SPI) method, which was used to monitor ecological drought in Northwestern China (NWRC). The performance of the SEWDI was compared with that of other widely-used drought indices, including standardized root soil moisture index (SSI), self-calibrated Palmer drought index (scPDSI), standardized precipitation-evaporation drought index (SPEI), and SPI, using the Pearson correlations between these indices and standardized normalized difference vegetation index (SNDVI) under different time scales, wetness and water use efficiencies (WUE) of vegetation. The SEWDI at a 12-month scale was decomposed in NWRC during 1982-2015 using the rotational empirical orthogonal function (REOF) in order to demarcate five ecological drought regions, including southeastern sub-region (SE), southwestern sub-region (SW), northwestern sub-region (NW), northeastern sub-region (NE), and central sub-region (CT). The characteristics of ecological drought in NWRC, such as intensity, duration, and frequency, were extracted using the run theory. The return periods of five types of drought were calculated using wavelet analysis. Results showed that the performance of SEWDI in monitoring ecological drought was the best among the drought indices under different time scales, and the 12-month-scale was largely unaffected by wetness and WUE. Results of monitoring indicated that serious ecological droughts in the NWRC mainly occurred in 1982-1986, 1990-1996, and 2005-2010, primarily in SE, SW, and CT, SW and NE, and NW, NE, and CT, respectively. Furthermore, SEWDI in the arid SW, NW and CT showed a longer return period compared to that in the humid NE and SE, and the evolution of ecological drought in arid regions was mainly influenced by meteorological drought and the scarcity of root soil moisture. This study provides ant approach for quantifying ecological drought severity across natural vegetation areas which can be employed by decision makers
英文关键词	Ecological drought Vegetation index Remote sensing Rotational empirical orthogonal function Northwestern China
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:000681690100002
WOS关键词	REMOTE-SENSING DATA ; RIVER-BASIN ; VEGETATION ; CLIMATE ; CHINA ; PRECIPITATION ; REQUIREMENT ; TEMPERATURE ; MONGOLIA
WOS类目	Biodiversity Conservation ; Environmental Sciences
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/362982
作者单位	[Jiang, Tianliang; Su, Xiaoling; Zhang, Gengxi] Northwest A&F Univ, Coll Water Resources & Architectural Engn, Weihui Rd 23, Yangling 712100, Shaanxi, Peoples R China; [Jiang, Tianliang; Su, Xiaoling; Zhang, Gengxi] Northwest A&F Univ, Key Lab Agr Soil & Water Engn Arid Area, Minist Educ, Yangling 712100, Shaanxi, Peoples R China; [Singh, Vijay P.] Texas A&M Univ, Dept Biol & Agr Engn, College Stn, TX 77843 USA; [Singh, Vijay P.] Texas A&M Univ, Zachry Dept Civil & Environm Engn, College Stn, TX 77843 USA; [Singh, Vijay P.] UAE Univ, Natl Water & Energy Ctr, Al Ain, U Arab Emirates
推荐引用方式 GB/T 7714	Jiang, Tianliang,Su, Xiaoling,Singh, Vijay P.,et al. A novel index for ecological drought monitoring based on ecological water deficit[J]. 西北农林科技大学,2021,129.
APA	Jiang, Tianliang,Su, Xiaoling,Singh, Vijay P.,&Zhang, Gengxi.(2021).A novel index for ecological drought monitoring based on ecological water deficit.ECOLOGICAL INDICATORS,129.
MLA	Jiang, Tianliang,et al."A novel index for ecological drought monitoring based on ecological water deficit".ECOLOGICAL INDICATORS 129(2021).