黄土高原沟壑区土壤抗蚀性的初步研究

A Study on the Soil Erodibility in the Loess Region

通过对黄土高原沟壑区不同地类土壤抗蚀性的研究,发现林草地土壤抗蚀性能明显高于农田,表层土壤的抗蚀性能一般比下层土壤要强。研究表明土壤容重、大于0.25mm的土壤水稳性团聚体含量以及土壤渗透系数是决定土壤抗蚀性大小的主导因素。通过运用逐步回归分析方法,得到了可用于预报和确定土壤抗蚀性的回归方程。

This paper is concerned with soil erodibility of different land types on the Loess Plateau. From the results obtained, it has been found that resistance to soil erosion in grassland and forest land soil is much higher than that of cultivated land. The resistance to soil erosion on the soil surface is higher than that of the subsurface.The statistical analysis demonstrates that soil volume weight (v), quantity of >0.25mm total aggregate (a) and infiltration coefficient (i) are the main factors that determine soil erodibility(k). the relationship between k and v,a,i can be described by the follwing regression equation; k= 27 .6261-14 9964v -0.1382a-2.5911i.