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采用室外调查与室内分析相结合的方法,统计分析了毛乌素沙地PLA沙障铺设5年后的土壤颗粒粒径组成、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)含量的之间的关系。结果表明:研究区沙物质颗粒主要以粒径大于0.05 mm的细沙、极细沙为主。设置PLA沙障后,导致沙丘中粗沙含量减少,黏粒物质增加。沙障规格对土壤分形维数的影响表现为规格越小,土壤分形维数越大。沙丘表层分形维数与砂粒含量(>0.05 mm)呈极显著的负相关关系,而与黏粒含量呈极显著的正相关关系。该地区颗粒分形维数的临界粒径为0.05 mm粒径物质,低于0.05 mm的颗粒含量越多,分形维数越高,反之则越低。设置PLA沙障后,黏粒物质聚集和沙粒物质的降低共同导致分形维数的增加。
By means of outdoor investigation and indoor analysis, the particle size and the fractal dimension of soil particles in the Mu Us Sandland after 5 years of laying were studied. 0.002 mm) and clay (<0.002 mm). The results show that the sand particles in the study area mainly consist of fine sand with fine grain size larger than 0.05 mm and very fine sand. After setting the PLA sand barrier, the coarse sand content in the sand dunes decreases and the amount of the caking matter increases. The effect of sand barrier specification on the fractal dimension of soil shows that the smaller the specification, the larger the fractal dimension of soil. The surface fractal dimension of sand dunes had a significant negative correlation with sand content (> 0.05 mm), but a very significant positive correlation with clay content. The critical particle size of the particle fractal dimension in this area is 0.05 mm particle size. The content of particles below 0.05 mm is higher, the higher the fractal dimension is, and vice versa. After setting up the PLA sand barrier, the accumulation of the aggregates and the reduction of the sand material together lead to the increase of the fractal dimension.