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| Soil fractal features of refuse dump in different land uses |
| (College of Resource and Environment Engineering, Liaoning Technical University, 123000, Fuxin, Liaoning, China) |
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Abstract Based on the fractal theory, we studied the fractal features of soil particles of refuse dump in different land use types, i.e., artificial forest, agricultural land and grassland, and discussed the effect of coal exploitation on the soil environment, attempting to provide scientific basis for the protection of the ecological conditions of mining areas and restoring the ecological functions of soil. The soil particles machinery composition of 10 levels of 0-100cm soil layer of three kinds land use types was measured in the refuse dump land reclamation area at the Fuxin Haizhou opencast mine with OMIC SCF-106 laser particle size analyzer, soil particles volume fractal dimension D was calculated with soil volume fractal model, and the physical and chemical properties of the soil sample were determined. The results showed that: 1) Different land use types affected soil fractal dimension significantly, while different levels of soil had no significant impacts on the soil fractal dimension; D values of the three sample regions ranged from 2.0786-2.7175, with an average D value of 2.4241. 2) The order of the average value of D in different sample regions was artificial forest (2.2457)＜grassland (2.5024)＜farm land (2.5476); 3) There was a polynomial curve relationship among the hydrolyzable nitrogen, total nitrogen and soil fractal dimension in the study area, and a logarithmic curve relation could be found between potassium and soil fractal dimension; the soil fractal dimension D value of refuse dump had a negative correlation with total soil nitrogen, hydrolyzable nitrogen and available potassium, but had no correlation with pH.
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Received: 05 June 2013
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