| 引用本文: | 田丽慧,张登山,胡梦珺,鲁瑞洁,赵超,吴汪洋.2012.黄土高原半干旱区侧柏林群落土壤呼吸日变化及季节动态变化特征[J].地球环境学报,(6):1134-1143 |
| TIAN Li-hui,ZHANG Deng-shan,HU Meng-jun,LU Rui-jie,ZHAO Chao,WU Wang-yang.2012.Dynamic change of desertified land in each county around Qinghai Lake in recent 30 years[J].Journal of Earth Environment,(6):1134-1143 |
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| DOI：10.7515/JEE201206003 |
| CSTR： |
| 分类号:X171 |
| 基金项目:2012-10-10 |
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| Dynamic change of desertified land in each county around Qinghai Lake in recent 30 years |
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TIAN Li-hui1, ZHANG Deng-shan1,2, HU Meng-jun3, LU Rui-jie1, ZHAO Chao1, WU Wang-yang1
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1.Key Laboratory of Environmental Change and Natural Disaster, Ministry of Education of the People's Republic of China, Beijing Normal University, Beijing 100875, China; 2.Qinghai Academy of Agriculture and Forestry, Xining 810016, China; 3.College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China
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| Abstract: |
| Desertification is one of the most serious eco-environmental problems around Qinghai Lake. Based on GIS and RS, GIS analysis was used to obtain the information of spatial-temporal change and different pattern of desertification in each county around Qinghai Lake in four phases of 1976, 1987, 1995 and 2006. Using the function of intersect and overlay supported by ARCGIS, with analyzing attributes of vector RS images, we obtained transition data and established transfer matrix of land-use types in recent 30 years, besides, protracted land-use transition maps of all desertification classes. In further, we analyzed transition quantity and direction of desertification in each county, moreover, reconstructed the process of spatial-temporal evolution of desertification. The results are showed below: (1) it′s the transition between desertified land and others but not in the desertified that played the main role in Gangcha and Gonghe County, while the transfer between desertified lands were greater than that with other land-use types in Haiyan County. (2) Extremely severe desertified land mainly distributes in Ketu and Sand Islands that belongs to Haiyan County, and moderate desertified land in riversides of Gangcha County, also, the light desertification expanded too rapidly to become the most desertified land-use type in the surrounding of Qinghai Lake since 1976. (3) By using relative change rate of desertified land, the regional variability rank from top to toe was Gangcha, Haiyan and Gonghe. |
| Key words: The area around Qinghai Lake desertified land transition of land-use types spatial change regional variation |
