科尔沁东部沙地土壤可风蚀性研究

Study on wind erodibility in soil under eastern Horqin sandy land

使用筛析法和SA—CP3粒度分析仪对科尔沁东部沙的耕地、沙岗地和裸地7个表土样品进行分析测试。结果表明：①研究区表土粒度组成以细砂和中砂为主（50%-70％），土壤可风蚀性较高；②不同土地利用类型中，耕地土壤可风蚀性程度大于沙岗地和裸地；③同一流域不同位置的土壤可风蚀性程度，西辽河东岸大于西岸；④对大气的粉尘贡献率，耕地远大于沙岗地和裸地。

By using soil sieve and SA- CP3 separator-size analyser, the authors analyzed seven surface soil samples, which were collected in three different land-use types including farmland, sand hill and bare ground in eastern Horqin. The results show that： （1） grain-size compositions of surface soil are dominated by medium sand and fine sand （50% -70% ）, with higher wind erodibility; （2） for different land-use types, the wind erodibility for farmland is higher than that for sand hill and bare ground; （3） for different positions of the same catchment, the wind erodibility at the east bank of Xiliao River is higher than that of the west bank; （4）the dust contributing ratio for farmland to atmosphere predominates by far over that of sand hill and bare ground.