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崩岗是鄂东南地区极其严重的土壤侵蚀类型,影响范围广,破坏性强。选择鄂东南通城县花岗岩崩岗不同层次土壤进行研究,主要分析崩岗剖面土壤颗粒分形维数、可蚀性、渗透性及水稳性,并通过回归分析等方法建立其与土壤性质之间的拟合关系。结果表明:鄂东南通城县崩岗土层表土层、红土层、斑纹层以及碎屑层的性质存在较大差异,土壤颗粒分形维数D由表土层至碎屑层呈减小的趋势,土壤可蚀性K值由表土层至碎屑层呈增加的趋势,水稳性指数则呈现减小的趋势,渗透性则表现为红土层小而表土层和碎屑层大的规律。同时,相关性分析以及多元线性回归分析显示,崩岗剖面土壤颗粒分形维数、可蚀性、渗透性以及水稳性之间关系密切,抗蚀性与土体性质之间的相关性显著。研究旨在明确了崩岗发生的内在因素,为阐述崩岗的发生机理提供了依据。
Collapsing is an extremely serious type of soil erosion in southeastern Hubei Province, affecting a wide range of destructive. In this paper, we selected the different levels of granite avalanche in Tongcheng County, southeast of Hubei Province to study the fractal dimension, erodibility, permeability and water stability of the collapse granite profile, and established the relationship between soil granulometry and soil properties by regression analysis Fitting relationship. The results show that the properties of topsoil, red soil layer, zebra layer and detrital layer in the collapsed gangue of Tongcheng County, Southeast of Hubei Province are quite different. The fractal dimension D of soil particles decreases from top soil to detrital layer, The K value of soil erodibility increased from topsoil to detritus layer, and the water stability index showed a decreasing trend. The permeability showed the law of small red soil layer and topsoil and detritus layer. At the same time, correlation analysis and multiple linear regression analysis showed that there is a close relationship between fractal dimension, erodibility, permeability and water stability of the collapsible profile. Correlation between corrosion resistance and soil properties is significant. The purpose of this study is to clarify the intrinsic factors of collapse and provide a basis for elucidating the mechanism of collapse.