不同土壤抗蚀性指标对侵蚀泥沙影响的灰色关联度分析

表征土壤抗蚀性的指标有土壤颗粒分散特性和土壤水稳性团聚体稳定特性方面的诸多指标。为研究不同土壤抗蚀性指标对侵蚀泥沙的影响程度,以江西水土保持生态科技园15个不同水保措施类型小区为研究对象,采用灰色关联度的方法,对土壤抗蚀性指标进行了对比分析。结果发现:选取的10个抗蚀性指标对土壤侵蚀模数影响最佳3指标分别为团聚度、受蚀性指数(Eva)和侵蚀率,团聚度与土壤侵蚀量关联度最大,为0.744;对土壤侵蚀模数影响最差3指标依次为湿筛水稳性团聚体平均重量直径(EMWD)、干筛团聚体平均重量直径差值(MWDC)和0.5mm水稳性团聚体重量百分数(WSA),EMWD与土壤侵蚀量关联度最小,为0.594。土壤颗粒分散特性比土壤水稳性团聚体稳定特性对土壤侵蚀量影响大,前者关联度平均为0.705,后者关联度平均为0.621。通过土壤抗蚀性指标与侵蚀泥沙不同关联度的比较和排序,可以为侵蚀影响程度排序等提供信息,对以后的相关研究工作具有促进作用和参考价值。

Effects of Different Anti-erodibility Parameters on Soil Erosion Based on Grey Correlation Degree Analysis

There are many parameters which can reflect soil anti-erodibility,such as soil particle dispersivity and stability of soil water-stable aggregates.To analyze the effects of different anti-erodibility parameters on soil erosion modulus,grey correlation analysis was used to study the anti-erodibility of red soil in 15 slope runoff plots with typical soil and water conservation measurements in Jiangxi Eco-science Park of Soil and Water Conservation.The results indicated that in the 10 anti-erodibility parameters,the first 3 factors affecting soil erosion modulus was soil agglomeration,soil erodibility index,and soil erosion rate.Soil agglomeration had the greatest effect on soil erosion,with the equal weighted grey correlation value 0.744.The descending rank of the last 3 factors affecting sediment yield is WSA,MWDC,and EMWD.EMWD had the smallest effect on soil erosion with the equal weighted grey correlation value 0.594.The effects of soil particle dispersivity on sediment yield is better than that of stability of soil water-stable aggregates,their average grey correlation values were 0.705 and 0.621,respectively.This study is helpful to provide information for the order of different factors′ effects on soil erosion modulus and for further study in the future.