Transformation and spatio-temporal distribution of sand-dust sourcesin Xinjiang based on LUCC
ZHANG Ning-ning;FANG Shi-feng;DU Jia-qiang;WU Hua;Institute of Geographic Science and Natural Resource Research,CAS;University of Chinese Academy of Sciences;Institute of Ecological Environment Research,CRAES;State Key Laboratory of Environmental Criteria and Risk Assessment CRAES;
Sand-dust sources provide material sources for dust weather via strong winds,so accurate identification of sand-dust sources plays an important role on forecasting of sand-dust weather and the improvement of regional eco-environment. So far,there are many researches on sand-dust sources focused on its temporal-spatial distribution characteristics and material composition,but transformation mechanisms of sand-dust sources have not caused extensive concern. Sand-dust weather takes place constantly in spring and summer in northern China,especially in the south of Xinjiang where the sand-dust weather is characteristic of high intensity and long duration. Therefore,this paper analyzed temporal-spatial distribution of sand-dust sources based on three years of land use and land cover product( 2000,2005 and 2010) in Xinjiang and discussed the transformation mechanisms of different types of sanddust sources by means of land use transition matrix. The results showed that the positive and negative transition of sand-dust sources are mainly related to human activities in Xinjiang. The sensitive areas of transformation of desert/sand land sand-dust sources are mainly distributed in the northwest edge of Taklimakan Desert. The main types of land use and land cover that were transitioned into bare soil sand-dust sources are rivers/lakes and grassland,and the transformation of rivers/lakes mainly caused by natural conditions including high temperature and drought,and the transformation of grassland mainly caused by over-grazing. The ecological environment had been destroyed heavily by excessive reclamation in the oasis-desert ecotones and the populated areas of the Junggar Basin and the north of the Tarim Basin. Xinjiang has large areas of oasis-desert ecotones,but they are potential dust source areas because of its fragile ecological system. Accordingly,the oasis-desert ecotones should be protected scientifically to prevent overgrazing and over-reclamation. This paper recognized and extracted dust source areas based on the land use and land cover types and analyzed transformation mechanism of dust source areas,and the research results could provide useful information for agricultural and animal husbandry development as well as regional eco-environment improvement.
【Fund】： 中国科学院战略性先导科技专项(A类)课题(XDA13010401);; 国家自然科学基金项目(U1503184);; 国家重点研发计划课题(2016YFC1402903)资助
【CateGory Index】： P425.55
【CateGory Index】： P425.55