广东省土壤可蚀性现状及影响因素分析

土壤可蚀性是土壤侵蚀预报和土地利用规划的重要参数,本文采用EPIC(Erosion Productivity Im-pact Calculator)模型中土壤可蚀性因子K值为指标,利用第二次土壤普查资料,探讨广东省土壤可蚀性K值及分布特征,并绘制了广东省土壤可蚀性K值图,结果表明:广东土壤可蚀性K值为0.116~0.415,加权平均K值为0.25,主要分布在较低-中高可侵蚀性范围;以铁铝土为例,成土母质对土壤侵蚀影响是多因素的,由于母质的特性差异,母质所发育土壤可蚀性K值并不能完全代表其侵蚀危害性,从总体上看,土壤经过多年耕种,抗侵蚀能力明显下降。

The Current Situation of Soil Erodibility (K) Value and its Impact Factors in Guangdong Province

Soil erodibility serves as a major parameter for soil erosion prediction and Land use planning.Based on the data of soil particle-size distribution,soil physical and chemical properties in the Second Soil Investigation of Guangdong Province,the soil erodibility(K) value in this region was investigated with the formula calculation method of EPIC(Erosion Productivity Impact Calculator),and the K value map well registered with the topographic map was made.Results showed that the soil erodible K value ranges from 0.116 to 0.415 in Guangdong Province,on which the weighted averages of the areas is 0.250,most of them belong to lower to middle-high soil erodibility;As a case of ferrallitic soil,the impact of bedrock to soil erosion is multi-form,for the diversity of bedrock`s property,the erodibility(K) value of soil from different bedrock is not be half of its risk of erosion entirely;as a whole,the cultivated land for several years,its anti-erosion force descended obviously.