Journal of Geographical Sciences >
The classification and assessment of freeze-thaw erosion in Tibet
Received date: 2007-02-08
Revised date: 2007-03-16
Online published: 2007-06-25
Supported by
Key Basic Research Project of China, No.2004CCA03600
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.
Key words: Tibet; freeze-thaw erosion; GIS; classification and assessment
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
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