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应用土壤颗粒的重量与粒径分布原理来描述了古尔班通古特沙漠地风沙土壤颗粒的分形特征。通过对10种样品颗粒的机械组成进行分析,分别计算出了它们的分形维数(D=2.3237～2.9347),并分析了其与流动风沙土、半固定风沙土和固定风沙土之间的关系。分析结果表明,风沙土壤结构具有明显的分形特征,其粒径分布分形维数为2～3。土粒表面分形维数与2～0.2mm间的土粒含量存在显著的负相关;而与0.02～0.002mm和<0.002mm的颗粒含量存在显著的正相关,表现为随着土壤质地从流动风沙土、半固定风沙土到固定风沙土的变化,其土粒表面的平均分形维数呈依次增高。土粒表面分形维数与三种典型风沙土壤有机质含量为极显著正相关,而与其硬度为显著负相关。
The fractal characteristics of the sand particles in the sand desert of the Gurbantunggut desert are described by applying the principle of weight and size distribution of soil particles. The fractal dimension (D = 2.3237 ~ 2.9347) of the 10 samples was calculated by analyzing the mechanical composition of the particles, and the relationship between the fractal dimension and the moving aeolian sand, semi-fixed aeolian sand and fixed aeolian sand was analyzed . The analysis results show that the soil structure of aeolian sand has obvious fractal characteristics, and its fractal dimension of particle size distribution is 2 ~ 3. There is a significant negative correlation between the fractal dimension of soil particles and the content of soil particles between 2 ~ 0.2mm, while there is a significant positive correlation with the content of particles of 0.02 ~ 0.002mm and <0.002mm, The change of soil and semi-fixed aeolian sandy soil to fixed aeolian sandy soil showed that the average fractal dimension of soil particle surface increased successively. The fractal dimension of soil particle surface was significantly and positively correlated with soil organic matter content of three typical aeolian soils, but negatively correlated with its hardness.