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| Characteristics of soil particles fractal dimension under different forest stands of the ecological restoration area in Dahei Mountain area |
| Yang Huiling1,Gao Peng1,Wang Huawei1,Ding Fujun2,Dai Wugang2 |
| 1.College of Forestry,Shandong Agricultural University,the Key Laboratory of Agricultural Ecology and Environment,271018,Tai'an,Shandong;2.Waterconservation Bureau of Chaoyang of Liaoning Province,122000,Chaoyang,Liaoning: China |
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Abstract In order to evaluate the effect of the ecological restoration on soil structure and function,characteristics of soil particles fractal under 6 typical vegetations of the ecological restoration area in Dahei Mountain area were studied according the quality principle of soil particle size distribution and theories of soil fractal.The results showed that:1)The soil particle size distribution of the different vegetation types varied greatly,the contents of soil clay and silt under woodland were 87.47% and 89.94% higher than that of grassland;sand and fine gravel content and coarse gravel content of woodland are lower 25.09% and 19.19% than that of grassland;in the various forest vegetation types,soil clay and silt content of natural forest such as Betula davurica Pall+Populus davidiana mixed,Quercus mongolicus Fisch and Ulmus macrocarpa are significantly higher than that of artificial forest such as Prunns mandshurica and Pinus tabulaeformis Carr.2)Soil particles fractal dimension of woodland is significantly higher than that of grassland,and natural forest is higher than that of artificial forest,and to the greatest is secondary natural mixed.3)The soil particles fractal dimension of the different vegetation types has a significant linear positive correlation to the clay content of soil particle size <0.05 mm and the silt content of soil particle size 0.05～0.25 mm.The soil particle is smaller,the higher the fine-grained concentration,the greater the fractal dimension.4)The soil particle fractal dimension of the different vegetation types had a significant negative linear correlation with soil uneven coefficient.Along with the lower soil uneven coefficient,fractal dimension of soil particle was increased.In addition to grassland,the other five typical forest stands are good structural soils in soil uneven coefficient.Soil particle distribution of natural forest is better,particularly,the secondary natural mixed the best,artificial forest is next-best.
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Received: 19 November 2008
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