山西省阳高县沙地的土壤风蚀规律

选择林地、未翻耕地、耕地、半流动沙地4种土地利用类型,通过定位实验观测与定量分析,研究阳高县沙地不同土地利用类型的风蚀规律。结果认为：1）不同类型近地层2 m内风速随高度近似地服从对数分布规律,林地的斜率最大为1.663 1,未翻耕地的斜率最小为0.895 4,说明林地上林分对风速梯度影响最大,风速降低比率最大,其他下垫面类型斜率大小次序是耕地〉半流动沙地〉未翻耕地。2）不同下垫面对应的粗糙度大小不同,林地粗糙度为3.267 9 cm,属于最大;其次为半流动沙地、耕地、未翻耕地。增大下垫面的粗糙度,可以控制风速和风沙流的产生及运动。3）林地、耕地、未翻耕地和半流动沙地土壤输沙量的大小依次为半流动沙地〉未翻耕地〉耕地〉林地。

Regular of Wind Erosion of Sandy Land in Yanggao County of Shanxi Province

The wind erosion rule of different lands in Yanggao County was studied by analyzing and observation location on forest land,uncultivated land,cultivated land, and semi-flow sandy land.The results indicate that,（1） for different land,the relation between wind speed and height of 2 m above ground obeys all logarithmic distribution law.The curve slope order is： forest land〉cultivated land〉semi-flow sandy land〉uncultivated land.of which forest land is 1.663 1,the maximum,and uncultivated land 0.895 4,minimum.The order of roughness is forest land〉semi-flow sandy land〉cultivated land〉uncultivated land,of which forest land is the maximum of 3.267 9 m.（2） The order of the amount of soil transporting sand is,semi-flow sandy land〉uncultivated land〉cultivated land〉forest land.