SOIL ERODIBILITY FACTOR K AS STUDIED USING FIELD PLOTS IN SUBTROPICAL CHINA
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Abstract:
In the work soil erodibility factor K of seven different types of soil in subtropical China was studied using field plots under natural rainfall condition. The field plots were established in Yingtan of Jiangxi Province. The results showed that there were great differences among soil erodibility factor K of seven different types of soils. Among them calcaric regosols developed on purple shale and cultivated cambisol on red sandstone had the highest factor K, being up to 0.440 and 0.438 (0.132 k.hr/MJ. mm) respectively. The lowest was eroded acrisols derived from Quaternary red clay, with factor K of only 0.104, being less than 1/4 of the factor K value of purple soil. The soil erodibility factor K of seven types of soils were also estimated by using the Wischmeier's nomography. These results showed that the factor K vaules of two types of soils estimated by the nomography were close to those measured using field plots, one of the seven types of soils had a bigger difference between the factor K obtained by the above two methods, three had a big difference, and one couldn't be estimated by the nomography. Therefore, the nomograph method for estimating soil erodibility factor K was almost unsuitable for the soil types in subtropical China.
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