Exacerbated grassland degradation and desertification in Central Asia during 2000-2014
Zhang, Geli1,2; Biradar, Chandrashekhar M.3; Xiao, Xiangming1,2,4; Dong, Jinwei5; Zhou, Yuting6; Qin, Yuanwei1,2; Zhang, Yao1,2; Liu, Fang5; Ding, Mingjun7,8; Thomas, Richard J.9
Corresponding AuthorXiao, Xiangming(xiangming.xiao@ou.edu)
AbstractGrassland degradation and desertification is a complex process, including both state conversion (e.g., grasslands to deserts) and gradual within-state change (e.g., greenness dynamics). Existing studies hardly separated the two components and analyzed it as a whole based on time series vegetation index data, which cannot provide a clear and comprehensive picture for grassland degradation and desertification. Here we propose an integrated assessment strategy, by considering both state conversion and within-state change of grasslands, to investigate grassland degradation and desertification process in Central Asia. First, annual maps of grasslands and sparsely vegetated land were generated to track the state conversions between them. The results showed increasing grasslands were converted to sparsely vegetated lands from 2000 to 2014, with the desertification region concentrating in the latitude range of 43-48 degrees N. A frequency analysis of grassland vs. sparsely vegetated land classification in the last 15yr allowed a recognition of persistent desert zone (PDZ), persistent grassland zone (PGZ), and transitional zone (TZ). The TZ was identified in southern Kazakhstan as one hotspot that was unstable and vulnerable to desertification. Furthermore, the trend analysis of Enhanced Vegetation Index during thermal growing season (EVITGS) was investigated in individual zones using linear regression and Mann-Kendall approaches. An overall degradation across the area was found; moreover, the second desertification hotspot was identified in northern Kazakhstan with significant decreasing in EVITGS, which was located in PGZ. Finally, attribution analyses of grassland degradation and desertification were conducted by considering precipitation, temperature, and three different drought indices. We found persistent droughts were the main factor for grassland degradation and desertification in Central Asia. Considering both state conversion and gradual within-state change processes, this study provided reference information for identification of desertification hotspots to support further grassland degradation and desertification treatment, and the method could be useful to be extended to other regions.
KeywordCentral Asia drought Enhanced Vegetation Index gradual change grassland degradation and desertification MODIS remote sensing state conversion
Indexed BySCI
Funding ProjectNational Institutes of Health NIAID[1R01AI101028-01-A2] ; Chinese Academy of Sciences[QYZDB-SSW-DQC005] ; Thousand Youth Talents Plan ; CGIAR Dryland Systems program
Funding OrganizationNational Institutes of Health NIAID ; Chinese Academy of Sciences ; Thousand Youth Talents Plan ; CGIAR Dryland Systems program
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEcology ; Environmental Sciences
WOS IDWOS:000426499100015
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorXiao, Xiangming
Affiliation1.Univ Oklahoma, Dept Microbiol & Plant Biol, Norman, OK 73019 USA
2.Univ Oklahoma, Ctr Spatial Anal, Norman, OK 73019 USA
3.Int Ctr Agr Res Dry Areas, Amman 11195, Jordan
4.Fudan Univ, Inst Biodivers Sci, Minist Educ, Key Lab Biodivers Sci & Ecol Engn, Shanghai 200433, Peoples R China
5.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing 100101, Peoples R China
6.Oklahoma State Univ, Dept Plant & Soil Sci, Stillwater, OK 74078 USA
7.Jiangxi Normal Univ, Minist Educ, Key Lab Poyang Lake Wetland & Watershed Res, Nanchang 330022, Jiangxi, Peoples R China
8.Jiangxi Normal Univ, Sch Geog & Environm, Nanchang 330022, Jiangxi, Peoples R China
9.ICARDA, CGIAR Res Program Dryland Syst, Amman 11195, Jordan
Recommended Citation
GB/T 7714
Zhang, Geli,Biradar, Chandrashekhar M.,Xiao, Xiangming,et al. Exacerbated grassland degradation and desertification in Central Asia during 2000-2014[J]. ECOLOGICAL APPLICATIONS,2018,28(2):442-456.
APA Zhang, Geli.,Biradar, Chandrashekhar M..,Xiao, Xiangming.,Dong, Jinwei.,Zhou, Yuting.,...&Thomas, Richard J..(2018).Exacerbated grassland degradation and desertification in Central Asia during 2000-2014.ECOLOGICAL APPLICATIONS,28(2),442-456.
MLA Zhang, Geli,et al."Exacerbated grassland degradation and desertification in Central Asia during 2000-2014".ECOLOGICAL APPLICATIONS 28.2(2018):442-456.
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