中国土壤可蚀性值及其估算

SOIL ERODIBILITY AND ITS ESTIMATION FOR AGRICULTURAL SOIL IN CHINA

土壤可蚀性是评价土壤对侵蚀敏感程度的重要指标,也是进行土壤侵蚀预报的重要参数。本文运用野外观测资料,研究了我国不同水土流失区的土壤可蚀性值问题。根据实测资料,计算给出了一组土壤可蚀性实测值。并利用这组实测值,对我国土壤可蚀性估算问题进行了探讨。结果表明,国外现有的可蚀性估算模型不能直接应用于我国土壤的可蚀性计算,估算值明显大于实测值。但估算值与实测值之间存在有良好的线形关系。最后提出了我国不同地区及不同资料占有情况下的土壤可蚀性估算方法。本文研究结果可以直接用于我国土壤侵蚀预报中土壤可蚀性计算。

Soil erodibility is an important indicator to evaluate soil susceptibility to erosion, and an important parameter in soil erosion prediction. A study was carried out on the issue of soil erodibility values of different soil erosion regions in China us- ing the data obtained from field observation of plots. A set of soil erodibility values were calculated using field data, and used to analyze feasibility of estimating erodibility of the soils in China. Results show that the soil erodibility estimation models now available from other countries could not be used directly in estimating soil erodibility in China, but there was a fine linear relationship between estimated values and measured values, though the former were obviously higher than the latter. A new method is advanced for estimating soil erodibility of the soils in China despite of difference in geographic region and availability of data. The results of the research could be directly used in prediction of soil erosion in China.