利用分形理论解决不同土粒分级标准间土壤质地资料的转换问题

基于分形理论,选取黄土高原南部厢寺川林场地区20个典型样点,每个样点取3个剖面,共60个土样的实测土壤颗粒粒径分布数据,分别应用分形模型、对数正态模型、逻辑生长模型、WEIBULL模型预测土壤颗粒累积百分含量,提出一种预测土壤颗粒粒径分布的分形模型。结果表明,在0.002～0.1mm粒级范围内,分形模型对已知土壤资料的粒级个数和预测粒级的大小等因素并不敏感,具有较高的预测精度和稳定性;与对数正态模型、逻辑生长模型和WEIBULL模型相比,分形模型的总体预测误差最小且未出现大误差数据,可以有效对不同土粒分级标准间土壤质地资料进行转换。

Conversion of Different Soil Texture Triangle Based on Fractal Theory

The soil texture is one of the most important indicators to reflect soil physical properties.It is the key input to many models,just as calculating the Erodibility K of the RUSLE and Pedo-Transfer Functions,which needs the soil texture of USA textural triangle.However,despite a number of recognized international stan-dards,soil data are rarely compatible across national frontiers.Therefore,interpolation of the soil texture in dif-ferent textural triangle is very necessary.Researches have shown that the soil...