岔口流域不同土壤质地转换模型精度验证

The Accuracy Varification of the Different Soil Texture Transformation Models in Cha-kou Watershed

为使土壤普查的土壤质地数据合理重用,采用分段三次Hermite插值方法、三次样条插值方法和线性插值方法3种土壤质地转换模型进行岔口流域土壤质地粒径间地转换,并与流域内各土种的实测土壤粒径值对照,通过均方根误差RMSE值和决定性系数R2值,评价了3种土壤质地插值转换模型的精度。结果表明,分段三次Hermite插值函数在描述粒径分布模型上最为理想,三次样条插值函数效果最差,线性插值函数介于两者之间。

In order to reasonably reuse the survey data of the soil texture, the conversion of the soil grain size of different soil textures in Chakou watershed were studied with three different models, piecewise cubic Hermite interpolation mod el, cubic spline interpolation model, and linear interpolation model. The accuracy of three models was determined and evaluated based on the RMSE and R2 values which were obtained from comparing the model values with the field survey values. The results showed that, the piecewise cubic Hermite interpolation model was the most accurate one, followed by linear interpolation model. Cubic sp[ine interpolation model was not effective enough.