种植不同作物对土壤抗剪强度影响

Effects of different types of crops on soil anti-shearing intensity

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 of different types of crops on soil anti-shearing intensity,this research took Moyunshan small watershed of Liaoning province as a study objective.The soil samples of soybean growing area,corn growing area,fruit trees growing area and fruit trees terraces were collected and the soil moisture contents were measured.Soil cohesion and angle of internal friction were measured by direct shearing.The correlations of soil shear strength and soil moisture between the same crops and the different ones were analyzed,as well as the internal friction angle.According to the experimental data（soil cohesion order：corn（49.27kpa）soybean（38.36kpa）terraces（30.00kpa）fruit tree（28.36kpa）;angle of internal fiction order：fruit tree（25.45°）soybean（23.26°）corn（20.24°）terraces（19.51°））,the results showed that the soil shear strength of corn growing area,soybean growing area,fruit trees growing area and fruit trees terraces had significant 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.