论分形几何在土壤大孔隙研究中的应用

Comment on Application of Fractal Geometry to the Study of Soil Macropores

土壤大孔隙是普遍存在的现象,并非例外,它对水及溶质在土壤中的运移有着深刻影响。介绍了分形几何在确定土壤大孔隙分布中的应用。对含有各种大孔隙的南京原状土柱进行CT扫描实验,对CT扫描图像进行处理,得到大孔隙在土壤横断面的分布。指出南京土壤大孔隙的分布不具有分形结构,采用分形几何理论建立的描述土壤大孔隙大小分布的公式不具有普遍的适用性。

Macropores in soil are general phenomena rather than the exception, they have greatly influence on the movement of water and solutes within soil. The application of fractal geometry to characterize the distribution of soil macropores is introduced. Nanjing Undisturbed soil core which has many macropores was scanned by CT, and cross-sectional distributions of the macroporoes were obtained. The results of this study indicated that the macropore distributions in Nanjing soil were not in line with the fractal structure and thus the fractal formula that describe the distribution of soil macropore are not universally applicable.