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以王朗自然保护区7种土壤为对象,运用分形模型研究了该区表层土壤颗粒粒径分布的分形维数,分析了分形维数与土壤理化性质如有机质含量、全氮、全磷、pH及容重的关系。结果表明,王朗自然保护区表层土壤颗粒的分形维数Dp为2.679 6～2.741 4;各土壤颗粒粒径与累积重量的对数相关系数R2>0.85(p<0.05);通过逐步多元回归分析,土壤颗粒的分形维数仅与粒径为0.001～0.005mm和小于0.001mm土壤颗粒含量呈显著正相关(p<0.05);此外,土壤颗粒的分形维数与土壤有机质、全氮、全磷和容重的关系不显著,然而土壤有机质含量与土壤全氮含量呈显著正相关(p<0.05)。通过对王朗自然保护区表层土壤颗粒粒径分布的分形维数的探究发现,该区土壤颗粒的分形维数偏低,土壤结构相对松散,易发生水土流失,需要加强该区生态建设。
Taking the 7 kinds of soils in Wanglang Nature Reserve as an example, the fractal dimension of surface soil particle size distribution in this area was studied. The fractal dimension and soil physical and chemical properties such as organic matter content, total nitrogen, total phosphorus, pH and Bulk relationship. The results showed that the fractal dimension Dp of surface soil particles in Wanglang Nature Reserve was 2.679 6 ~ 2.741 4, and the logarithm correlation coefficient R2> 0.85 (p <0.05) of grain size and cumulative weight of each soil. Through stepwise multiple regression analysis, The fractal dimension of soil particles was only positively correlated with soil particle content of 0.001 ~ 0.005mm and less than 0.001mm (p <0.05). In addition, the fractal dimension of soil particles was positively correlated with soil organic matter, total nitrogen, The relationship between soil organic matter and soil total nitrogen was significantly and positively correlated (p <0.05). Based on the study of the fractal dimension of surface soil particle size distribution in Wanglang Nature Reserve, it is found that the fractal dimension of soil particles in this area is low, the soil structure is relatively loose, soil erosion is easy to occur, and ecological construction in this area needs to be strengthened.