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| DOI：10.13522/j.cnki.ggps.2022108 |
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| Particle Composition and Fractal Dimension Vary with LandManagement for Soils in Coastal Regions |
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ZHU Yun, FU Qinglin, GUO Bin, LIN Yicheng, LIU Chen
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1. College of Forestry, Nanjing Forestry University, Nanjing 210037, China;
2. Institute of Environmental Resources, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
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| Abstract: |
| 【Objective】Soil particle composition and its fractal dimension are a parameter to characterize soil physical property; they are closely correlated to soil fertility and productivity. The purpose of this paper is to study its variation with land management.【Method】The experiment site was at Shangyu County in Shaoxing City of Zhejiang Province. Soil samples were taken from 0~100 cm profile from four land managements: tidal flat, paddy field, and orchard and vegetable field. For each sample, we measured its particle composition and fractal dimension, pH, EC, nutrients and enzymatic activities, from which we analyzed if and how soil fertility and physicochemical properties are correlated to fractal dimension and particle composition using factor-analysis method.【Result】The fractal dimension was in the range of 2 to 3, and it was significantly higher in the paddy, orchard and vegetable field than in the tidal flat. The land use affected content and distribution of particle composition and fractal dimension both at significant level (P＜0.05). In the newly reclaimed coastal saline soil and paddy soil, the fractal dimension is the highest in the 0~20 cm soil layer, while in the orchard and vegetable field, it is the highest in the 80-100cm soil layer.【Conclusion】There is a significant correlation between soil particle fractal dimension and soil fertility (P＜0.01). The fractal dimension, which is easy to measure, can thus be used as a proxy for soil fertility in evaluating soil health. |
| Key words: coastal area; land use type; fractal dimension of soil particles; soil fertility |
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