土壤透气性及粘土颗粒比表面积与粘土颗粒粒度分布分形维数关系

Correlation of Soil Air Permeability and Specific Area with Clay Particle Size Distribution Fractal Value

采用数字显微系统测定了部分华南地区土壤中粘土颗粒粒径分布分形维数值,提出了土壤中粘土颗粒群粒度分布分形维数的几何法计算模型,并就这种分形维数与土壤比表面积和土壤透气性等性质的相互关系作了初步探讨。结果表明,采用数字显微系统测定的粘土颗粒粒径分布分形维数值介于2.2708到2.9483之间,与常规方法测定结果吻合;含砂较多的土壤样品,BET比表面积和Blaine透气时间随粒度分布分形维数值增大而减小;含粘粒较多的土壤样品,BET比表面积和Blaine透气时间同随粒度分布分形维数值增大而增大。

We used a digital micro -analysis to test particle size distribution fractal value in some clay -soil regions of South China and a new method to calculate it was brought forward. Also we the fractal value with the soils＇specific area and air permeability. The primarily discussed the relationships between results indicated that the clay particle size distribution fractal value tested by the digital micro - analysis system ranged between 2. 270 8 to 2. 948 3, which was similar to that from conventional methods; as for soil samples containing much more sand, the BET specific area and the Blaine aeration time decreased when the size distribution fractal value increased; as for the soil samples containing much more clay, the BET specific area and the Blaine aeration time increased with the increment of size distribution fractal value.