洛宁县土壤可侵蚀性研究

Study on the Soil Erodibility of Luoning County

土壤可蚀性因子K值表示土壤被冲蚀的难易程度,是影响土壤流失量的内在因素。用ArcGIS软件处理得到洛宁县土壤类型图,运用EPIC模型中的K值计算方法,根据土壤机械组成计算得出洛宁县各种土壤的K值并生成K值图。结果显示:①洛宁县土壤中不易蚀土占全县总面积的59.18%,在山地区呈"箕"形分布;较易蚀土占全县总面积的35.44%,多分布在森林覆盖率低的农垦区,比较容易导致土壤侵蚀。②土壤可蚀性因子K值代表了土壤抵抗水蚀能力的大小,与土壤的抗冲抗蚀能力呈负相关关系,是土壤侵蚀模数定量研究的重要因子。

The soil erodibility factor K stood for the difficulty degree of the soil erosion,which was the intrinsic factor of the soil loss quantity. Using the ArcGIS, the soil map of Luoning County was obtained,the K computational method in the model of EPIC was applied, received the K value and the K value chart of all kinds of soil of Luoning County according to the soil mechanical composition. The results showed that the eroded soil accounts for the total soil area 59. 18% in the Luoning County,and it presented ＂ji＂ shaped; accounted for the total soil area 35.44% ,most distributed in reclamation area with low forest coverage,and it easily caused soil and water loss; The soil erodiable factor K represented the size of soil resistance against water erosion,it had a negative correlation with the soil anti-erosion,and it was the important factor about the soil erosion modulus quantitative investigation.