为了确定不同作物种植对土壤抗剪强度的影响，以辽宁省摩云山小流域为研究对象，分别采集大豆地、玉米地、果树地和果树台田样本等土样。测定土壤含水量，利用直剪法测定土壤黏聚力和内摩擦角，分析同一种作物和不同作物的土壤剪切力与土壤含水量关系以及同一种作物和不同种作物的内摩擦角的关系。结果表明：土壤黏聚力玉米地(49.27kpa)>豆地(38.36kpa)>果树台田(30.00kpa)>果树地(28.36kpa)；内摩擦角果树地(25.45°)>豆地(23.26°)>玉米地(20.24°)>果树台田(19.51°)；玉米地的剪切力与豆地的剪切力、果树地的剪切力和果树台田的剪切力均有显著性差异；不同作物的土壤黏聚力和土壤含水量进行二次线性分析，拟合度较好。

To ascertain the influences on soil anti-shearing intensity of different types of crops, this research is aimed at Moyunshan Small Watershed of Liaoning Province. The soil samples of soybean growing area, corn growing area, fruit trees growing area and fruit trees terraces are collected and the soil moisture contents are measured. Soil cohesion and angle of internal friction are measured by direct shearing. It analyses the correlation of soil shear strength and soil moisture between the same crops and the different ones, as well as the internal friction angle. According to the experimental data(soil cohesion: corn(49.27kpa)>soybean(38.36kpa)> terraces(30.00kpa) >fruit tree(28.36kpa); angle of internal fiction: fruit tree(25.45°)>soybean(23.26°)>corn(20.24°)> terraces(19.51°)), the analysis results show that the soil shear strength of corn growing area, soybean growing area, fruit trees growing area and fruit trees terraces has dramatic differences. The quadratic linear analysis of the soil cohesion and soil moisture contents of different types of crops was conducted, and the fitting degree was good.

辽宁省自然科学基金(20062110)；辽宁省教育厅项目(L2010496)