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为揭示乌兰布和沙漠沿黄段耕地、草地和林地等土地利用类型的土壤分形特征与防蚀固沙效果的关系,采用野外取样与室内分析相结合的方法,分析了该区3种土地利用类型的土壤颗粒粒径分布、分形维数及其关系。结果表明:不同土地利用方式对土壤粒径分布与分形维数影响明显,草地及林地以粉粒、黏粒为主,耕地则以细砂、极细砂为主,分形维数呈现林地>草地>耕地的趋势。分形维数与<0.05mm和>.0.05mm粒径含量分别呈极显著正相关和负相关,其大小由<0.05mm的粉粒和黏粒含量决定,分形维数也可做为研究区域防蚀固沙效果的评价指标。
In order to reveal the relationship between the fractal characteristics of soil and the effects of erosion and sand fixation on the land along the Yellow River in the Ulanbuh Desert and the desertification areas, three methods of field sampling and indoor analysis were used to analyze the relationship between three types of land use Types of Soil Particle Size Distribution, Fractal Dimensions and Their Relationships. The results showed that different land use patterns had significant effects on the distribution of soil particle size and fractal dimension. Grassland and woodland were dominated by silt and clay, and the main arable land was fine sand and ultrafine sand. The fractal dimension showed that forest land> grassland > Arable land trends. The fractal dimension was significantly and positively correlated with the content of <0.05mm and> 0.05mm respectively. The size of the fractal dimension was determined by the content of <0.05mm silt and clay, and the fractal dimension could also be used as the study area Erosion and Sediment Efficacy Evaluation Index.