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统计分析了库布齐沙漠流动沙丘、设置沙柳活沙障和死沙障沙丘的土壤颗粒粒径分布、分形维数及其与土壤砂粒(>0.05 mm)、粉粒(0.05~0.002 mm)和黏粒(<0.002 mm)含量的关系。结果表明:与流动沙丘相比,设置沙障沙丘的粉粒和黏粒含量增加,且随着土层的加深而表现为下降趋势,不同部位则均呈沙丘下部>上部>中部的趋势。土壤颗粒分形维数因设置沙障而呈增大趋势,且表现为活沙障沙丘>死沙障沙丘>流动沙丘;垂直分布上,设置沙障沙丘的土壤分形维数随土层加深而逐渐减小,而流动沙丘表现为表层与下层大而中层小的特征,沙丘不同部位的分形维数则均表现为沙丘下部>上部>中部。土壤颗粒分形维数大小与土壤质地的细粒化有一致的变化趋势,且与砂粒含量呈极显著负相关关系,而与黏粒含量、粉粒含量呈极显著正相关关系。<0.05 mm粒径物质含量的增加和>0.05 mm粒径物质含量的降低共同导致了土壤颗粒分形维数在设置沙障后的增大。
The distribution and fractal dimension of soil particles in sand dunes (> 0.05 mm), silt particles (0.05 ~ 0.002 mm) And clay (<0.002 mm) content. The results show that the content of silt and clay in the sand dune is higher than that in the sand dune, and shows a downward trend with the deepening of the soil dune. The fractal dimension of soil particles showed an increasing tendency due to the setting of sand barrier, and the results showed that the fractures of the sand barriers> sand barrier> sand dunes> mobile sand dunes. On the vertical distribution, the fractal dimension of the sand barriers set the soil gradually While the mobile sand dunes showed the features of large and middle middle layer of the surface layer and the lower layer. The fractal dimension of different parts of the sand dunes showed the lower part of dune> upper part> middle part. The fractal dimension of soil particles is consistent with the grading of soil texture. There is a significant negative correlation between the fractal dimension of soil particles and the content of sand particles, while there is a significant positive correlation between the fractal dimension of clay particles and the content of clay particles. An increase of <0.05 mm particle size and a decrease of> 0.05 mm particle size together lead to an increase in the fractal dimension of the soil particles after setting up the sand barrier.