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土壤自身的可侵蚀性是土壤侵蚀发生的内在因素。由于具有明确的物理意义和方便的测定方法,土壤可蚀性K指标值成为水土流失预报模型的一个重要参数。采用EPIC中土壤可蚀性K值计算方法,对丹江口水库库区内1.94km2的五龙池小流域的K值进行了计算。结果显示,研究区内土壤可蚀性K值平均为0.0302thm2h(MJmmhm2)-1,与我国其他有黄棕壤分布地区已有的研究结果相一致。小流域土壤可蚀性存在一定的空间变异,但变异性不大(变异系数14.7%),86.56%土地面积上的K值位于0.0264~0.0330之间。从土壤可侵蚀性强弱判断,该区土壤为易侵蚀土。利用反距离权重插值(IDW)进行了K值图的制作,并简要介绍了K值图的应用。
Soil erosion is the inherent factor of soil erosion. Due to its definite physical meaning and convenient measuring method, K value of soil erodibility has become an important parameter of soil erosion prediction model. Based on the calculation method of soil erodibility K in EPIC, the K value of 1.94km2 Wulongchi catchment in Danjiangkou reservoir area was calculated. The results showed that the average value of soil erodibility K in the study area was 0.0302thm2h (MJmmhm2) -1, which was in good agreement with the existing research results of yellow brown earth in China. The soil erodibility of small watershed has some spatial variability, but the variability is not big (coefficient of variation is 14.7%). The K value of 86.56% of the land area is between 0.0264 ~ 0.0330. Judging from the soil erosion of soil erosion, the soil is easy to eroded soil. The K-value graph was generated by inverse distance weighted interpolation (IDW), and the application of K-value graph was briefly introduced.