不同粒径制间土壤质地资料的转换问题研究

STUDY ON THE CONVERSION OF DIFFERENT SOILS TEXTURE

使用不同土壤类别的黄绵土、灰褐土机械组成资料 ,通过对比三次样条插值、二次样条插值、线性插值法插值结果 ,探讨了不同粒径制间土壤质地的数学转换方法 ,结果表明三次样条插值法是最优方法 ,其最小相对误差不到 0 6% ,最大相对误差不超过 3 5 % ,平均 2 48%。土壤质地转换数学方法的建立对于应用土壤普查资料计算土壤可蚀性K值 。

Based on data of different soil types, the conversion of soil texture by mathema tical methods including cubic spline interpolation, square spline interpolation and linear interpolation was studied. The result showed that cubic spline interp olation is superlative and the minimum relative error is 0.6%, the maximum error 3.5%, average 2.48%. The development of the texture conversion by mathematical method is valuable for calculating soil erodibility K based on data of soil prop erties and is meaningful for calibrating soil erodibility nomograph.