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| Soil fractal features of typical forest stands in Jinyun mountain of Chongqing city |
| Wang Yujie1, Wang Yunqi1, Xia Yiping2, He Zhengming2, Jiangcheng2, Zhang Shengtao2 |
1.College of Soil and Water Conservation Beijing Forestry University; Key Lab. Soil and Water Conservation and Desertification Combating,
Ministry of Education, 100083, Beijing; 2.Chongqing JinYunShan National Nature Protection Region Management Bureau, 400700, Chongqing:China |
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Abstract For exploring the forest soil physical property in Three Gorges Reservoir areas, based on the fractal theory, the soil fractal features of the 4 typical forests (mixed Pinus massoniana-broadleaf forests, evergreen broadleaf forests, Phyllostachys pubescens forests and evergreen broadleaf shrub forests) in Jinyun mountain, Chongqing City were studied as well compared to arable land. It has been proposed that the model can be used for the analysis of the relationship between the fractal dimensions and the properties of forest soil. The impacts of fractal dimensions change on soil properties change were analyzed with the elasticity analysis and marginal yield analysis. The results showed that the fractal dimension of partical size distribution (PSD), the micro-aggregate size distribution (ASD) and the soil pore size distribution (SPD) can be used as the indexes of soil structure evaluation. In the typical forests of Jinyun mountain, the soil PSD is 2.7-2.9, the ASD is 2.5-2.8, and the SPD is 2.3-2.8. The soil structure of evergreen broadleaf shrub forests are all the best in PSD, ASD and SPD, and the soil of Phyllostachys pubescens forests is the worst. There also were the certain relationships between the PSD, ASD, SPD and some soil properties in the different forests and farmland. The related coefficients is over 0.5. Based on the elasticity analysis and marginal yield analysis, the effect of PSD was more than those of ASD and SPD. Obviously, the further research on the fractal theory application in soil structure and soil properties has important significance.
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Received: 10 November 2005
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