The classification and assessment of freeze-thaw erosion in Tibet

被引:0
|
作者
Jianguo Zhang
Shuzhen Liu
Siquan Yang
机构
[1] Nantong University,School of Geography
[2] CAS,Institute of Mountain Hazards and Environment
[3] MCA,National Disaster Reduction Center
来源
Journal of Geographical Sciences | 2007年 / 17卷
关键词
Tibet; freeze-thaw erosion; GIS; classification and assessment;
D O I
暂无
中图分类号
学科分类号
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.
引用
收藏
页码:165 / 174
页数:9
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