摘要
采用数学模型和GIS分析相结合的方法 ,以西藏自治区土壤普查资料为数据源 ,计算出西藏高原各土种的土壤可蚀性K值。在此基础上 ,以县为单元并运用面积进行加权平均 ,获得该区的土壤可蚀性K值分布图。对高原特殊成土条件下可蚀性的研究与探索 ,有利于深入理解西藏高原的土壤侵蚀特点、规律及其成因 ,提高土壤侵蚀的预报精度。
The Tibetan Plateau is located in southwest China, is the main body of the Qinghai-Tibetan Plateau, its total area is 1.2046×106 km2, but the area with soil erosion is as large as 1.0342×106 km2 and occupies 85.85% of the total land area. Soil erosion on the Tibetan Plateau is complicated and diverse, it includes the alluvial erosion, wind erosion, freezing-thaw erosion, etc. In this paper, the values of soil erodibility (K values) of all the soil types on the Tibetan Plateau are calculated by using some mathematical models and GIS and by taking the soil survey data of Tibet Autonomous Region as the data source. On which the weighted averages of the areas with the different values of soil erodibility are derived, and the distribution map of the values of soil erodibility is charted. The results show that the soils in the northwestern part of the Tibetan Plateau are rocky, and their soil Erodibility is low, so the soils are difficult to be eroded; the soil Erodibility in the southeastern part of the plateau is high, and eth soils are easy to be eroded. The results can be as the references in the study on soil erodibility under the peculiar soil-formation conditions.
出处
《干旱区地理》
CSCD
北大核心
2004年第3期343-346,共4页
Arid Land Geography
基金
"洪水特性与减灾方法"资助 (编号 :5 0 0 9962 0 )
中科院山地所青年基金 (SD2 0 0 3Y10 13 )资助
