DIFFUSION WITHIN SOIL MICROSTRUCTURE A STRUCTURAL PARAMETER FOR SOILS
DIFFUSION WITHIN SOIL MICROSTRUCTURE A STRUCTURAL PARAMETER FOR SOILS
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土壤微结构内的扩散 土壤的结构参数
DOI：
10.1111/j.1365-2389.1965.tb01439.x
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发表时间：
1965
影响因子：
4.2
通讯作者：
J. Currie
中科院分区：
文献类型：
--
作者：
J. Currie
总结
为了估计气体在土壤碎屑内的扩散系数Dc，首先在干燥的1-2 mm碎屑的填料上测量气体扩散，然后在碎屑孔而不是碎屑间孔通过用惰性液体饱和而变得不导电之后再次测量气体扩散。使用类似的非均质材料的电性能方程，DC/DO的值的范围是从0.025到0.156的8个土壤的碎屑孔隙度在0.25至0.41的范围内。对于每种土壤，土壤复杂性的单值参数由Dc/Do和适当的碎屑孔隙度计算得出，这些参数与田间已知行为雅阁：结构越好，复杂性参数越小。该方法的有效性进行了检查，通过测量扩散系数，D，通过标准方法对块的土壤，也通过间接方法对破碎块获得的碎屑。D和Dc的这些值的比较（理想情况下相同）证实了该方法的适当性。
Summary
To estimate the diffusion coefficient of gases, Dc, within soil crumbs gaseous diffusion was measured first on a packing of dry 1–2 mm crumbs, then again after the crumb pores, but not the inter-crumb pores, had been rendered nonconducting by saturating with an inert liquid. Using equations for analogous electrical properties of heterogeneous materials, the range of values of Dc/Do was from 0.025 to 0.156 for eight soils with crumb porosities in the range 0.25 to 0.41. For each soil, single value parameters for soil complexity were calculated from Dc/Do and the appropriate crumb porosity, and these were in accord with known behaviour in the field: the better the structure, the smaller is the complexity parameter. The validity of the method was checked by measuring the diffusion coefficient, D, by standard methods on blocks of soil and also by the indirect method on crumbs obtained by crushing the block. Comparison of these values for D and Dc, ideally the same, confirmed the adequacy of the method.