鄂东南崩岗不同层次土壤分形特征及抗蚀性研究

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。

RESEARCH ON DIFFERENT SOIL LAYERS OF COLLAPSING GULLY FRACTAL CHARACTERISTICS AND EROSION CHARACTERISTICS IN TONGCHENG

Collapsing gully is an extremely serious soil erosion type in the southeast of Hubei Province, which has a wide range of influence and destruction. Therefore, it is important to study the mechanism of the collapsing gully and erosion mechanism for improving the ecological environment of agricultural areas. We chose the granite in Tongcheng County, Southeastern Hubei collapsing at different levels to study soil, mainly toanalyze collapsing gully profile fractal dimension of soil particle, erodibility, permeability and water stability, and through regression analysis and other methods to establish the relationship between soil properties. Results showed that:the soil of collapsing gully in Tongcheng County in Southeastern Hubei topsoil layer, clay layer and markings layer and debris layer properties are quite different, soil particle fractal dimension D from surface soil to detritus layer showed a decreasing trend, soil erodibility K values from surface soil to detritus layer showed an increasing trend, water stable index showed a decreasing trend, permeability is laterite layer and the surface soil layer and debris layer of rules. At the same time, the correlation analysis and multivariate linear regression analysis showed that profiles of slope disintegration of soil particle fractal dimension, can be erosion resistance, permeability and water stability between closely related, the correlation between anti erodibility and soil properties significantly. The purpose of this study is to clarify the internal factors of the occurrence of collapsing gully, and to provide a basis for the occurrence mechanism of the collapsing gully.