川西亚高山针叶林土壤颗粒的分形特征

分形理论为土壤等复杂体系的定量化研究提供了一种有效工具。本文以12个川西亚高山针叶林土壤颗粒组成数据为基础,运用分形模型研究了亚高山针叶林土壤颗粒的分形维数。结果表明,12个川西亚高山针叶林表层土壤颗粒的分形维数D为2.5209~2.7978。通过逐步多元回归分析,土壤颗粒分形维数仅与<0.001 mm颗粒含量的相关系数达极显著。土壤颗粒分形维数与土壤有机质含量、全氮含量和pH相关性不显著,然而土壤有机质含量与全氮含量呈极显著正相关。本研究探讨了利用土壤颗粒粒径分布的分形维数来定量表征川西亚高山针叶林土壤的特征。

Fractal characteristics of soil particles under subalpine coniferous forests in Western Sichuan

Fractal theory deals with the natural figures and images with self-similarity but without characteristic length,which offers an effective tool to quantitatively study complicated systems such as soil.Based on this theory,the fractal characteristics of soil particle size distribution under the 12 subalpine coniferous forests in Western Sichuan were studied,and the results showed that the fractal dimension of soil particles in surface layer ranged from 2.5209 to 2.7978.This fractal dimension only had a very significant correlation with the content of <0.001 mm soil particles.No significant correlations were observed between this fractal dimension and the contents of soil organic matter,total nitrogen and pH,but there was a very significant correlation between the contents of soil organic matter and total nitrogen.The quantitative symbolization of the characteristics of subalpine coniferous forest soil by the fractal dimension of soil particle size distribution was discussed in the paper.