Fractal Dimensions of Soil Particle Surface in Plowed Layers

The fractal dimensions(D) of soil particle surface were studied by determining 31 soil samples from plowed layers with different texture. The results indicated that the D value was 2.7060 to 2.9968 in those soils,and the difference was not significant in the soils with the same soil texture,but the D value increased with the soil particle size from sand to clay.The statistical analysis results showed that: there was a linear regression relationship between the fractal dimensions of particle surface and soil particle contents.The importance of direct contribution of four smallest soil particle size to D value was clay〉fine silt〉coarse silt〉medium silt,and the increase of any kind of soil partial size content would result in the increase of D value by the indirect change of other soil particle contents.The relationship between the soil organic matter,CEC value and D value was positively correlated,and the correlation between soil organic matter content and D value could be described as O.M =229.1113+86.5400D and CEC =-84.6456+32.1086D.