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土壤结构性是影响土壤肥力的一个重要因素。本文运用分形模型对不同植被类型土壤水稳性团聚体进行了研究,探讨了分形维数与土壤肥力的关系。结果表明:土壤团聚体粒径分布的分形维数与水稳性团聚体含量之间存在呈显著线性回归关系,林地和不同开垦年限农地土壤的物理性质随土壤团聚体的分形维数变化而变化,即分形维数越小,>0.25mm水稳性团聚体含量越高,土壤容重越小,总孔度大,毛管孔隙和通气孔隙占总孔隙的比例大,自然含水量和田间持水量相应较高;有机质、全N、碱解N与分形维数呈极显著的负相关,分形模型为土壤肥力研究提供新方法。上述结果在一定程度表明,植被遭到破坏、不合理的人为开垦,是土壤退化和生态环境恶化的主要原因。
Soil structure is an important factor affecting soil fertility. In this paper, fractal models were used to study the water-stable aggregates of different vegetation types, and the relationship between fractal dimension and soil fertility was discussed. The results showed that there was a significant linear regression relationship between the fractal dimension of soil aggregate size and the content of water-stable aggregates. The physical properties of forest land and agricultural land with different reclamation years varied with the fractal dimension of soil aggregates The smaller the fractal dimension is, the higher the content of> 0.25mm water-stable aggregates is, the smaller the soil bulk density is, the larger the total pore size is, and the ratio of capillary pores and aeration pores to total pores is larger. The natural water content and field capacity Correspondingly higher. The organic matter, total nitrogen and alkaline hydrolysis N had extremely significant negative correlation with the fractal dimension. Fractal model provided a new method for the study of soil fertility. The above results to a certain extent show that vegetation is destroyed, unreasonable man-made land reclamation is the main reason for soil degradation and ecological deterioration.