土壤颗粒级配和质地是描述土壤物理性质的最基本的参数。近年来,不少学者探讨利用分形理论对土壤颗粒级配特征进行描述。作者对这一方法进行了总结和评价。利用分形理论可以推导出大于某特征粒径R的颗粒总数N(r>R)与R有以下关系:N(r>R)∝R~(-D),式中D为颗粒级配分数维。实际分析中颗粒数N很不便于计算,只是近似地由颗粒质量间接推得,因而这一方法并没有严格遵守分形所要求的自相似原则。此外,利用颗粒总数计算分 Soil particle size distribution and texture are the most basic parameters describing soil physical properties. In recent years, many scholars have discussed the use of fractal theory to describe the characteristics of soil particle grading. The author summarizes and evaluates this method. The fractal theory can deduce that the total number of particles N (r> R) greater than a certain characteristic particle size R has the following relationship with R: N (r> R) αR ~ (-D) . The actual analysis of the number of particles N is not easy to calculate, but indirectly derived from the particle quality indirectly, so this method does not strictly comply with the fractal required self-similar principle. In addition, the total number of particles is used to calculate the score