Influence of Loess Interlayer Thickness on Water Transport in Sand
Influence of Loess Interlayer Thickness on Water Transport in Sand
复制标题
黄土夹层厚度对砂土中水输运的影响
DOI：
10.15244/pjoes/146188
复制
发表时间：
2022-05
影响因子：
1.8
通讯作者：
Chao Wu;Y. Bi;P. Christie
中科院分区：
文献类型：
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作者：
Chao Wu;Y. Bi;P. Christie
土壤剖面的质地决定着土壤水分的运动和分布，也影响着植物的生长发育。大多数研究都集中在水在均匀或分层土壤剖面，如粗砂或砾石作为毛细屏障的运动。利用黄土作为砂的夹层来研究土壤剖面水分分布特征的研究较少。在室内土柱中构建了砂-黄土-砂土分层剖面，探讨了不同厚度（0、10和20 cm）黄土夹层对水分运移的影响。不同黄土夹层厚度处理下，湿润锋推进高度随时间呈幂函数变化，黄土夹层对湿润锋推进高度有促进作用。黄土夹层处理显著提高了相应处理层（40-60 cm）土壤体积含水量。黄土夹层越厚，土壤体积含水量越高。排水2个月后，黄土夹层处理层（40-60 cm）的体积含水量没有下降，而对照下降了1.36%。研究结果可为干旱半干旱煤矿区人工重建土壤剖面以优化土壤含水量提供科学依据和理论支持。
The texture of the soil profile determines the movement and distribution of soil water and also affects plant growth and development. Most studies have focused on the movement of water in homogeneous or layered soil profiles such as coarse sand or gravel as a capillary barrier. Few studies have used loess as an interlayer of sand to study the water distribution characteristics of soil profiles. Here, a layered sand-loess-sand soil profile was constructed in indoor soil columns to explore the effects of different thicknesses of loess interlayer (0, 10 and 20 cm) on water transport. The advancing height of the sand wetting front followed a power function with time in different loess interlayer thickness treatments and the loess interlayer promoted the advancing height of the wetting front. Loess interlayer treatment significantly increased the soil volumetric water content in the corresponding treatment layer (40-60 cm). The thicker the loess interlayer the higher the soil volumetric water content. After two months of soil drainage the volumetric water content in the treatment layer (40-60 cm) corresponding to the loess interlayer treatment did not decline but the control declined by 1.36%. These results may provide a scientific basis and theoretical support for the artificial reconstruction of soil profiles in arid and semi-arid coal mining areas to optimize sand moisture content.