African dryland ecosystem changes controlled by soil water

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	African dryland ecosystem changes controlled by soil water
	Wei, Fangli 2; Wang, Shuai 1; Fu, Bojie 1; Wa, Lixin 6; Liu, Yi Y.; Li, Yan 1
刊名	LAND DEGRADATION & DEVELOPMENT
	2019-08-15
卷号	30 期号:13 页码:1564-1573
关键词	African drylands ecosystem changes soil water vegetation optical depth woody encroachment
ISSN号	1085-3278
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.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/42376]
专题	生态环境研究中心_城市与区域生态国家重点实验室
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China 3.Liu, Yi Y.] Univ New South Wales, Arc Ctr Excellence Climate Syst Sci & Climate Cha, Sydney, NSW 2052, Australia 4.Liu, Yi Y.] Univ New South Wales, Water Res Ctr, Sch Civil & Environm Engn, Sydney, NSW 2052, Australia 5.IUPUI, Dept Earth Sci, Indianapolis, IN 46202 USA 6.Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China
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]. LAND DEGRADATION & DEVELOPMENT,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.