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| 西藏冻融侵蚀的分级和评价 | |
| 引用本文： | 张建国,刘淑珍,杨思全. 西藏冻融侵蚀的分级和评价[J]. 地理学报(英文版), 2007, 17(2): 165-174. DOI: 10.1007/s11442-007-0165-z |
| 作者姓名： | 张建国 刘淑珍 杨思全 |
| 作者单位： | [1]School of Geography, Nantong University, Nantong 226007, China [2]Institute of Mountain Hazards and Environment, CAS, Chengdu 610041, China [3]National Disaster Reduction Center, MCA, Beijing 100053, China |
| 基金项目： | Key Basic Research Proiect of China, No.2004CCA03600 |
| 摘 要： | Freeze-thaw erosion is the third largest soil erosion type after water erosion and wind erosion. Restricted by many factors, few researches on freeze-thaw erosion have so far been done at home and abroad, especially those on the assessment method of freeze-thaw erosion. Based on the comprehensive analysis of impact factors of free-thaw erosion, this paper chooses six indexes, including the annual temperature range, annual precipitation, slope, aspect, vegetation and soil, to build the model for relative classification of freeze-thaw erosion using weighted and additive methods, and realizes the relative classification of the freeze-thaw erosion in Tibet with the support of GIS software. Then a synthetic assessment of freeze-thaw erosion in Tibet has been carried out according to the relative classification result. The result shows that the distribution of freeze-thaw eroded area is very extensive in Tibet, accounting for 55.3% of the total local land area; the spatial differentiation of freeze-thaw erosion with different intensities is obvious; and the difference in distribution among different regions is also obvious. |
| 关 键 词： | 西藏 冻融侵蚀 分类 评价 GIS |
| 收稿时间： | 2007-02-08 |
| 修稿时间： | 2007-02-082007-03-16 |
The classification and assessment of freeze-thaw erosion in Tibet |
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| Zhang Jianguo,Liu Shuzhen,Yang Siquan. The classification and assessment of freeze-thaw erosion in Tibet[J]. Journal of Geographical Sciences, 2007, 17(2): 165-174. DOI: 10.1007/s11442-007-0165-z | |
| Authors: | Zhang Jianguo Liu Shuzhen Yang Siquan |
| Affiliation: | 1. School of Geography, Nantong University, Nantong 226007, China|;2. Institute of Mountain Hazards and Environment, CAS, Chengdu 610041, China|;3. National Disaster Reduction Center, MCA, Beijing 100053, China |
| Abstract: | Freeze-thaw erosion is the third largest soil erosion type after water erosion and wind erosion. Restricted by many factors, few researches on freeze-thaw erosion have so far been done at home and abroad, especially those on the assessment method of freeze-thaw erosion. Based on the comprehensive analysis of impact factors of free-thaw erosion, this paper chooses six indexes, including the annual temperature range, annual precipitation, slope, aspect, vegetation and soil, to build the model for relative classification of freeze-thaw erosion using weighted and additive methods, and realizes the relative classification of the freeze-thaw erosion in Tibet with the support of GIS software. Then a synthetic assessment of freeze-thaw erosion in Tibet has been carried out according to the relative classification result. The result shows that the distribution of freeze-thaw eroded area is very extensive in Tibet, accounting for 55.3% of the total local land area; the spatial differentiation of freeze-thaw erosion with different intensities is obvious; and the difference in distribution among different regions is also obvious. |
| Keywords: | Tibet freeze-thaw erosion GIS classification and assessment |
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