黄土高原石灰性耕层土壤分形特征

Fractal Features of the Calcareous Plowed Layer Soil in the Loess Plateau

以24个黄土高原石灰性耕层土壤样品数据为基础,运用分形模型研究了黄土高原石灰性耕层土壤颗粒的分形维数,探讨了利用土壤颗粒粒径分布的分形维数来定量表征黄土高原石灰性耕层土壤的特征。结果表明,24个黄土高原石灰性耕层土壤颗粒的分形维数D为2.5936～27094,分形维数表现为干润砂质新成土>黄土正常新成土>简育干润均腐土>土垫旱耕人为土;土壤颗粒分形维数与<0.001mm颗粒的含量呈显著正相关,土壤颗粒分形维数与土壤有机碳含量、全氮含量和碳/氮比相关性不显著;土壤有机碳含量与全氮含量呈显著正相关。

The quantitative characterization of the soil characteristics of calcareous plowed layer in the Loess Plateau by using the fractal dimension of soil particle size distribution was discussed.Based on the soil sample data of 24 calcareous plowed layers,the fractal dimension of soil particle in calcareous plowed layer in the Loess Plateau was studied by using the fractal model.The results showed that the fractal dimensions of the calcareous plowed layer soil ranged from 2.593 6 to 27 094.Fractal dimensions of soil were different in various types of soils,Ust sandic entisols Los orthic entisols Hap ustic isohumisols Eum orthic anthrosols.There was a highly significant correlation relationship between the fractal dimension and the content of soil particle（ 0.001 mm）.The fractal dimensions of soil particle were not significantly correlated with the contents of organic carbon,total nitrogen and C/N.However,there was a highly significant correlation between the content of organic carbon and one of total nitrogen.