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| Fractal characteristics of soil particles in the Hilly-gully Regions of the Loess Plateau,North of Shaanxi,China |
| Dong Lili1,Zheng Fenli2,3 |
| 1.College of Tourism and Environment,ShaanXi Normal University,710062,Xi'an; 2.College of Resources and Environment,Northwest Sci-Tech University of Agriculture and Forestry,3.The State Key Laboratory of Soil Erosion and Dry land Farming on Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Science and Ministry of Water Resource: 712100,Yangling,Shaanxi:China |
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Abstract The particle size distributions(PSD) of forty soil samples from the ten kinds of land use and four soil profiles were presented.PSD were measured by Malvern Mastersizer 2000 and analyzed by applying fractal geometry method.Results indicate that there is no significant variation in the fractal dimensions(D) of the soil(between 2.230 and 2.521) due to the same soil texture.There is significantly correlation between volume percentage of <0.002 mm and D values;and D values are affected indirectly by other soil size classes which are related to <0.002 mm.D values of PSD could represent the degree and proportion of the soils finer.In addition,because of the nonlinear characterization of volume cumulative percentage,one D value could not characterize the PSD across the whole size class range of the measurements.Two fractal scaling domains were identified and D1 and D2 were calculated,and D1 is larger than D2.The boundary between the two domains is located at the particle diameter of 15 μm.Probability of fragmentation calculated by D1 and D2 is scale-dependent.
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Received: 17 September 2008
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