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dc.contributorBiradar, Chandrashekharen_US
dc.contributorXiao, Xiangmingen_US
dc.contributorDong, Jinweien_US
dc.contributorZhou, Yutingen_US
dc.contributorQin, Yuanweien_US
dc.contributorZhang, Yaoen_US
dc.contributorLiu, Fangen_US
dc.contributorDing, Mingjunen_US
dc.contributorThomas, Richarden_US
dc.creatorZhang, Gelien_US
dc.identifier.citationGeli Zhang, Chandrashekhar Biradar, Xiangming Xiao, Jinwei Dong, Yuting Zhou, Yuanwei Qin, Yao Zhang, Fang Liu, Mingjun Ding, Richard Thomas. (1/3/2018). Exacerbated grassland degradation and desertification in Central Asia during 2000–2014. Ecological Applications, 28(2), pp. 442-456.en_US
dc.description.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° N. A frequency analysis of grassland vs. sparsely vegetated land classification in the last 15 yr 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 regionsen_US
dc.publisherEcological Society of Americaen_US
dc.sourceEcological Applications;28,(2018) Pagination 442,456en_US
dc.subjectgradual changeen_US
dc.subjectgrassland degradation and desertificationen_US
dc.subjectenhanced vegetation indexen_US
dc.subjectstate conversionen_US
dc.titleExacerbated grassland degradation and desertification in Central Asia during 2000–2014en_US
dc.typeJournal Articleen_US
cg.subject.agrovocremote sensingen_US
cg.subject.agrovoccentral asiaen_US
cg.contributor.centerUniversity of Oklahoma, Center for Spatial Analysis - OU - CSAen_US
cg.contributor.centerInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.centerUniversity of Oklahoma, College of Arts and Sciences - OU - CASen_US
cg.contributor.centerChinese Academy of Sciences - CASen_US
cg.contributor.centerUniversity of Oklahomaen_US
cg.contributor.centerCRP on Dryland Systems - DSen_US
cg.contributor.crpCRP on Dryland Systems - DSen_US
cg.contributor.funderCGIAR System Office - CGIAR - Sysen_US
cg.contributor.project-lead-instituteInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.coverage.regionEastern Asiaen_US
cg.coverage.regionCentral Asiaen_US
dc.identifier.statusOpen accessen_US

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