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在总结现有7Be示踪法估算土壤侵蚀速率模型的基础上,通过坡耕地径流小区野外模拟降雨实测侵蚀资料,比较了Walling、杨明义和Wilson等所建的利用7Be示踪法估算土壤侵蚀速率模型的计算结果,并验证各模型的准确度。结果表明,对于不发生细沟侵蚀的小区,3个模型的计算值都有较高的准确度,但Wilson模型相对其它两个模型计算结果误差较大;对于发生细沟侵蚀的小区,Walling模型和杨明义模型估算坡面细沟间侵蚀量的绝对差值较小,但大于不发生细沟侵蚀小区的绝对差值;Wilson模型能够比较准确计算坡面的总侵蚀量,与实测值相比较,相对误差为3.59%～14.47%,不发生细沟侵蚀的小区相对误差大于发生细沟侵蚀的小区。随着侵蚀强度的增大,3个模型计算结果的准确度呈降低趋势。
Based on the existing 7Be tracer method for estimating soil erosion rate, the simulated rainfall data from field simulated runoff plot in slope farmland were compared. The soil erosion rate model was estimated by Walling, Yang Mingyi and Wilson et al. Using 7Be tracer method The calculation results, and verify the accuracy of the model. The results show that the calculated values of the three models have higher accuracy for the cells without rill erosion, but the Wilson model has relatively large errors compared with the other two models. For the cell with rill erosion, the Walling model And Yang Ming-yi model, the absolute difference of the erosion amount between the ramps is smaller than that of the rickets without erosion. The Wilson model can calculate the total erosion amount of the ramps more accurately. Compared with the measured values, The relative error is 3.59% ~ 14.47%. The relative error of the area without rill erosion is larger than that of the area with rill erosion. With the increase of erosion intensity, the accuracy of the calculation results of three models shows a decreasing trend.