干旱区生态环境知识资源中心(Arid): African dryland ecosystem changes controlled by soil water

Arid

DOI	10.1002/ldr.3342
	African dryland ecosystem changes controlled by soil water
	Wei, Fangli 1,2; Wang, Shuai 3; Fu, Bojie 1,3; Wa, Lixin 4; Liu, Yi Y.5,6; Li, Yan3
通讯作者	Wang, Shuai
来源期刊	LAND DEGRADATION & DEVELOPMENT
ISSN	1085-3278
EISSN	1099-145X
出版年	2019
卷号	30 期号:13 页码:1564-1573
英文摘要	Monitoring long-term vegetation dynamics in African drylands is of great importance for both ecosystem degradation studies and carbon-cycle modelling. Here, we exploited the complementary use of optical and passive microwave satellite data- normalized difference vegetation index (NDVI) and vegetation optical depth (VOD)-to provide new insights of ecosystem changes in African drylands. During 1993-2012, 54% of African drylands experienced a significant increase of VOD, mainly located in southern Africa and west and central Africa, with an average rate of increase of (1.2 +/- 2.7) x 10(-3) yr(-1). However, a significant decreasing NDVI was observed over 43% of the African drylands, in particular in western Niger and eastern Africa, with an average browning rate of (-0.13 +/- 1.5) x 10(-3) yr(-1). The contrasting vegetation trends (increasing VOD and decreasing NDVI) were largely caused by an increase in the relative proportion of the woody component of the vegetation, as a result of the prevailing woody encroachment in African drylands during the study period. Soil water emerges as the dominant driver of ecosystem changes in African drylands, in particular in arid and semiarid areas. This is evidenced by a strong spatio-temporal correlation between soil water and vegetation, where soil water changes explain about 48% of vegetation variations. This study emphasizes the potential of utilizing multiple satellite products with different strengths in monitoring different characteristics of ecosystems to evaluate ecosystem changes and reveal the underlying mechanisms of the observed changes.
英文关键词	African drylands ecosystem changes soil water vegetation optical depth woody encroachment
类型	Article
语种	英语
国家	Peoples R China ; USA ; Australia
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000477742300004
WOS关键词	VEGETATION DYNAMICS ; LAND DEGRADATION ; TRENDS ; GREENNESS ; EXPANSION ; FRAMEWORK ; MOISTURE ; NDVI3G ; SHIFTS ; COVER
WOS类目	Environmental Sciences ; Soil Science
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217474
作者单位	1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China; 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China; 3.Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China; 4.IUPUI, Dept Earth Sci, Indianapolis, IN 46202 USA; 5.Univ New South Wales, Arc Ctr Excellence Climate Syst Sci & Climate Cha, Sydney, NSW 2052, Australia; 6.Univ New South Wales, Water Res Ctr, Sch Civil & Environm Engn, Sydney, NSW 2052, Australia
推荐引用方式 GB/T 7714	Wei, Fangli,Wang, Shuai,Fu, Bojie,et al. African dryland ecosystem changes controlled by soil water[J]. 北京师范大学,2019,30(13):1564-1573.
APA	Wei, Fangli,Wang, Shuai,Fu, Bojie,Wa, Lixin,Liu, Yi Y.,&Li, Yan.(2019).African dryland ecosystem changes controlled by soil water.LAND DEGRADATION & DEVELOPMENT,30(13),1564-1573.
MLA	Wei, Fangli,et al."African dryland ecosystem changes controlled by soil water".LAND DEGRADATION & DEVELOPMENT 30.13(2019):1564-1573.