皖西皖南土壤可蚀性值及估算方法验证

土壤可蚀性是水土流失预测的基础数据,可蚀性指标值的准确与否直接影响到水土流失预测精度。利用径流小区实测资料,研究了皖西、皖南主要土壤可蚀性值,并对EPIC模型和诺谟公式进行了验证。结果表明:皖西、皖南不同土壤可蚀性实测值差异较大,其值范围为0.013～0.043 t·hm~2·h/(MJ·mm·hm~2),黄棕壤最小,红壤最大,红壤可蚀性值是黄棕壤的3.3倍;同一种土壤不同方法估算的土壤可蚀性值差异较大,在没有实测资料验证的情况下,难以选择适宜的土壤可蚀性估算方法。研究结果为皖西、皖南水土流失预测提供了数据参考。

Soil erodibility value and estimation method verification of western and southern Anhui Province

Soil erodibility directly affects the soil erosion prediction accuracy. This paper studies soil erodibility of western and southern Anhui Province by using the measured data of runoff plots. Then the EPIC model and nomo-formula are verified. It is showed that the difference of soil erodibility in western and southern Anhui Province is great. The measured values of soil erodibility differ with soil types, with range of 0.013-0.043 t·hm2·h/(MJ·mm·hm2). The erodibility value of the red soil is 3.3 times of the yellow brown soil. The estimated values of soil erodibility vary greatly for the same soil type by using different methods. It is difficult to choose the appropriate method for estimating soil erodibility without measured data verification. The soil erodibility value estimated by the EPIC model and the nomo-formula are much higher than the measured values. The results provide basic data and technical support for the soil erosion prediction, which is of great significance to the protection of land resources and the ecological construction of soil and water conservation in the region.