Study On Fractal Characteristics Of Soil Particle

In this paper,fractal model was applied to calculate fractal dimensions of soil particle distribution based on the analysis of soil particle contents in cultivable land and grassland of Siziwangqi,the north-western part of Inner Mongolia.And the fractal characteristics of soil particle was studied,the results as follow:(1)There are the close relationship between the fractal dimensions of soil and granulometric composition of soil.Lower the content of thin sand and higher the content of clay,higher the fractal dimensions in cultivable land.In grassland,higher the content of thick sand,smaller the fractal dimensions.And higher the content of clay,higher the fractal dimensions. Moreover the fractal dimensions are best line-relative with soil particle,when the diameter of soil particle is smaller than 0.001 millimetre.The mathematical model was created between the fractal dimensions and the content of clay and verified.(2)In addition,the fractal dimensions of soil particle are positively relative with the content of organic matter.Higher the content of organic matter,higher the fractal dimension of soil particle.(3)the effect of the content of clay and even index on the fractal dimensions of surface soil particle was discussed under different land coverage.The dimensions are positively relative with clay content,and significantly negative with even index.(4)the fractal dimensions of soil particle increase with land coverage but decrease with soil erosion degree.Soil coverage can effectively improve soil structure and texture,it has an effect on the fractal dimensions of soil particle.(5)In cultivable soil profile,deeper the soil layer, higher the fractal dimensions of soil particle,but in grassland the fractal dimensions of soil depth are smaller than surface soil.In addition the fractal dimensions of grassland are highter than cultivable land in surface soil.