湖北省土壤可蚀性研究

Study on Soil Erodibility of Hubei Province

利用环境政策综合气候模型(EPIC模型),结合土壤有机质、全氮、全磷、全钾含量及其分布面积,研究了湖北省各土类的土壤可蚀性K值及其分布面积。结果表明:(1)湖北省平均土壤可蚀性K值为0.228 5,各土类土壤的K值在0.208~0.250之间,其中最大的是棕壤,为0.249 7,最小的是紫色土,为0.208 3。(2)湖北省中可蚀性土壤占绝大部分,占全省土地总面积的59.33%,而中低可蚀性土壤只占2.68%。(3)砂粒(2~0.02 mm)含量最少的是石灰土,为22.35%,最多的是潮土,为55.97%;粉粒(0.02~0.002 mm)含量最少的是紫色土,为27.40%,最多的是棕壤,为42.00%;黏粒(<0.002mm)含量最少的是潮土,为13.95%,最多的是石灰土,为40.52%。(4)各土类土壤全氮含量为0.75~10.09 g/kg,全磷含量为0.32~1.10 g/kg,全钾含量为0.77~20.72 g/kg,有机质含量为11.80~255.30 g/kg。

The paper studied the soil erodibility K value and the distribution area of various kinds of soil in Hubei Province by using environmental policy integrated climate model( EPIC model) and combining with the contents of organic matter,total nitrogen,total phosphorus and total potassium and its distribution area. The outcomes show that a) the average erodibility K value of the province is 0.228 5,the K value of each kind of soil is between 0.208-0.250,of which,the maximum K value of soil erodibility is brown soil of 0.249 7 and the minimum is purple soil of 0.208 3; b) the medium-level erodibility accounts for the majority. The medium-level erodibility soil makes up 59. 33% of the total area of the province and the medium to low-level erodibility soil only makes up 2.68%; c) the minimum sand grain( 2-0.02 mm) content is lime soil of 22.35% and the maximum is fluro-aquic soil of 55.97%. The minimum silt( 0.02-0.002 mm) content is purple soil of 27.40%and the maximum is brown soil of 42.00%. The minimum clay( < 0.002 mm) content is fluro-aquic soil of 13.95% and the maximum is lime soil of 40.52% and; d) the total nitrogen content of each kind of soil is 0.75-10.09 g/kg,the total phosphorus content 0.32-1.10 g/kg,the total potassium content 0.77-20.72 g/kg and the organic matter content is 11.80-255.30 g/kg.