陕西4种土壤粒径分布的分形特征研究

Fractal characteristics of particle-size distribution for four kinds of soil samples in Shaanxi

采用分形模型 ,研究了陕西 4种不同质地的土壤粒径的重量分布。结果表明 ,土壤结构具有明显的分形特征 ,其粒径分布分形维数为 0～ 3。分形维数与土壤中粘粒含量呈明显的线性相关 ,表现为粘粒含量越高的土壤 ,其分形维数也越高。分形维数不仅受粘粒含量的支配 ,还与土壤质地的均一程度有关 ,土壤质地均匀指数 Iu与分形维数也表现出一定的相关性 ,但相关性较弱。

Fractal model has been used to study soil structure by using mass based soil particle size distribution (PSD) data.The conclusion is:soil structure has clear fractal scaling,the range of soil PSD of the fractal dimension behavior is strictly limited to 0< D <3.There is a clear linear correlation between the fractal dimension and the clay content,when the clay content is higher,the fractal dimension is higher too.The fractal dimension is not only deeply affected by the clay content,but also by the uniformity of texture approximately.There is a linear correlation between the fractal dimension and the index of uniformity (Iu),but the correlation is lower against the relationship between fractal dimension and the clay content.