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土壤黏聚力、内摩擦角及紧实度在一定程度上影响着土壤侵蚀。通过对黔中喀斯特地区林地、灌草地和坡耕地3种地类土壤的剖面调查、紧实度测定、原状土剪切试验,研究了黔中喀斯特地区不同地类土壤的土力学特征,结果表明:不同地类A层土壤黏聚力c水平分布特征为林地(52.28kPa)>灌草地(36.80kPa)>坡耕地(25.05kPa),垂直变化不明显;A层土壤内摩擦角φ水平分布特征为林地(28.28°)>坡耕地(17.94°)>灌草地(16.52°),垂直变化特点为B层大于A层;A层土壤紧实度水平分布特征为林地(1019kPa)>灌草地(914kPa)>坡耕地(535kPa),A层与B层差异性显著,地类对A层影响明显,总体上表现为上松下紧的态势;土壤紧实度与黏聚力呈正相关关系。
Soil cohesion, internal friction angle and compaction affect soil erosion to a certain extent. The soil mechanics characteristics of soils in different landforms in the Karst area of Guizhou Province were studied through the cross-section survey, compaction test and undisturbed soil shear test on the soils of the forest land, shrub land and sloping land in the middle reaches of Guizhou Province. The results show that : The horizontal distribution of soil cohesion C in layer A of different types is not obvious in forestland (52.28kPa)> shrub and grassland (36.80kPa)> sloping field (25.05kPa), and horizontal distribution of soil frictional angle in layer A (28.28 °), slope farmland (17.94 °) and shrub and grassland (16.52 °). The vertical variation was that the B layer was greater than the A layer. The soil compaction level of the A layer was characterized by forestland (1019kPa) )> Slope cultivated land (535 kPa), the difference between A and B is significant, and the influence of Arable Land on A layer is obvious. Generally speaking, there is a positive and negative correlation between soil compaction and cohesion.