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采集高盖度玄武岩斜坡典型植被云南松和狗牙根土体,基于水分穿透法,采用方差分析、回归分析方法,进行对滑坡孕育及发生有显著影响的土体大孔隙特征研究。分析表明:植被类型并不能控制土体大孔隙水分运动的整体发展规律,但影响水分穿透曲线的振幅及稳定时间。2种植被土体均存在大直径(>2.4 mm)大孔隙量小,小直径大孔隙量大的特征;不同植被土体各层大孔隙数量不同,但并不影响大直径大孔隙数量的土体空间分布。2种植被土体大孔隙直径主要集中于2.6~0.6 mm,平均直径范围为1.86~1.0 mm;大孔隙尺寸范围受控于植被类型,而尺寸分布受其影响较小。不同植被土体水分流速受大孔隙特征的影响程度不同。总体上,2种植被土体各层大孔隙数量、平均孔径、最大孔径、最小孔径、大孔隙度、稳渗速率均随深度增大而减小;根系和有机质对不同植被土体大孔隙特征有不同的影响;颗粒分布对云南松和狗牙根土体各层大孔隙特征参量无显著功效。研究得出大孔隙的一个下限尺度值为600μm。
To collect the typical Vegetation of Pinus yunnanensis and Bermudagrass soil on the high cover basalt slope. Based on the water penetration method, variance analysis and regression analysis methods were used to study the macropores characteristics of the soil that had significant impact on the occurrence and occurrence of landslides. The analysis shows that the vegetation type does not control the overall development of soil macropore water movement, but affects the amplitude and stabilization time of the water penetration curve. 2 There are large diameters (>2.4 mm) of large pores (>2.4 mm) in the planted soil, and small-diameter large-porosity features; different layers of vegetation have different numbers of macropores, but do not affect the large-diameter macropores Spatial distribution. 2 The diameter of large pores of planted soil is mainly concentrated in 2.6~0.6 mm, and the average diameter range is 1.86~1.0 mm. The size range of macropores is controlled by vegetation type, and the size distribution is less affected by it. The velocity of the soil moisture in different vegetations is affected by the degree of macroporosity. In general, the number of macropores, average pore size, maximum pore size, minimum pore size, macroporosity, and infiltration rate of each layer of soil in the 2 planting soils decreased with increasing depth; the characteristics of macropores of soils with different vegetations in roots and organic matter There are different effects; particle distribution has no significant effect on the macro-pore parameters of each layer of Yunnan pine and Bermudagrass soil. It was found that a lower limit value of the large pores is 600 μm.