高级检索
    敖家坤, 牛健植, 谢宝元, 骆紫藤, 蔺星娜, 杨澜. 土壤大孔隙结构对饱和导水率的影响[J]. 北京林业大学学报, 2021, 43(2): 102-112. DOI: 10.12171/j.1000-1522.20190429
    引用本文: 敖家坤, 牛健植, 谢宝元, 骆紫藤, 蔺星娜, 杨澜. 土壤大孔隙结构对饱和导水率的影响[J]. 北京林业大学学报, 2021, 43(2): 102-112. DOI: 10.12171/j.1000-1522.20190429
    Ao Jiakun, Niu Jianzhi, Xie Baoyuan, Luo Ziteng, Lin Xingna, Yang Lan. Influence of soil macropore structure on saturated hydraulic conductivity[J]. Journal of Beijing Forestry University, 2021, 43(2): 102-112. DOI: 10.12171/j.1000-1522.20190429
    Citation: Ao Jiakun, Niu Jianzhi, Xie Baoyuan, Luo Ziteng, Lin Xingna, Yang Lan. Influence of soil macropore structure on saturated hydraulic conductivity[J]. Journal of Beijing Forestry University, 2021, 43(2): 102-112. DOI: 10.12171/j.1000-1522.20190429

    土壤大孔隙结构对饱和导水率的影响

    Influence of soil macropore structure on saturated hydraulic conductivity

    • 摘要:
        目的   探究土壤不同孔径大孔隙结构特征及数量对土壤饱和导水率的影响,为研究区域土壤水分—溶质迁移规律、水土流失治理与土壤污染防治提供理论参考。
        方法   以京郊密云水库五座山林场水源涵养林为研究点,基于工业CT扫描技术,对土柱中土壤大孔隙三维空间结构重建后,探究不同孔径大孔隙结构特征参数密度及数量密度对土壤饱和导水率的影响。
        结果   (1)除当量孔径大于4.30 mm以外的大孔隙,当量孔径越大,其数量密度越小,结构特征参数密度越小;(2)6个样地3个土层内当量孔径为0.31 ~ 2.30 mm的大孔隙占所有孔隙的比例均高于95%;(3)样地1、2、5和6中饱和导水率最大的均在0 ~ 10 cm土层,且除样地6外,均随深度增大而减小,样地4的饱和导水率随深度增大而增大;(4)除当量孔径大于4.30 mm的大孔隙体积密度外,5个径级所有其他的大孔隙特征值密度均与饱和导水率呈显著正相关。
        结论   (1)在0 ~ 30 cm土层内,大部分样地的饱和导水率随土层深度增加而减小,但也会出现随深度增加而增大的情况;(2)林地土壤的大孔隙当量孔径主要集中在0.31 ~ 2.30 mm,其占有率高达95%;(3)当量孔径越小的大孔隙,除大孔隙体积和表面积外的大孔隙结构特征参数密度越大;(4)除当量孔径 > 4.30 mm的大孔隙体积密度以外的大孔隙特征参数与饱和导水率均呈显著正相关,大孔隙数量对饱和导水率的影响要显著大于大孔隙结构参数。

       

      Abstract:
        Objective  This paper aims to explore the influence of structure and quantity of macropores with different diameter classes on the saturated hydraulic conductivity of soil, and to provide a theoretical reference for the study of soil water solute transport law, soil erosion control and soil pollution control in this area.
        Method  The study was carried out on water conservation forest in Wuzuoshan Forest Farm of Miyun Reservoir in Beijing suburb. Based on the industrial CT scanning technology, the three-dimensional spatial structure of soil macropores in the soil column was reconstructed to explore the influence of structural parameter density and quantity density of macropores with different diameter classes on the soil saturated hydraulic conductivity.
        Result  (1) Excepting for equivalent diameter large than 4.30 mm, the larger the equivalent diameter of macropores was, the smaller the quantity density and structural parameter density of macropores were. (2) In three soil layers of six sample plots, the proportion of macropores with an equivalent diameter of 0.31−2.30 mm to all macropores was higher than 95%. (3) The maximum saturated hydraulic conductivity of sample plot 1, 2, 5 and 6 was in 0−10 cm soil layer, and it decreased with the increase of soil depth, but except for sample plot 6. The saturated hydraulic conductivity of sample plot 4 increased with the soil depth increasing. (4) Except for the volume density of macropores with an equivalent diameter greater than 4.30 mm, all the other eigenvalue densities of macropores had a significantly positive correlation with the saturated hydraulic conductivity.
        Conclusion  (1) In the 0−30 cm soil layer, the saturated hydraulic conductivity of most sample plots decreases with the soil depth increasing, but it possibly increases with the soil depth increasing. (2) The equivalent diameter of macropores in the soil of forest is mainly concentrated in 0.31−2.30 mm, and its occupancy rate is more than 95%. (3) When equivalent diameter of macropores is smaller, the density of characteristic parameter of macropore structure is greater except for the volume and surface area of macropores. (4) There is a significantly positive correlation between the characteristic parameter of macropores and the saturated hydraulic conductivity except for the volume density of macropores with equivalent diameter greater than 4.30 mm. The influence of macropore number on saturated hydraulic conductivity is significantly greater than structure parameters of macropores.

       

    /

    返回文章
    返回