Depth-dependent heterogeneity of water flow in sandy soil under grass
Depth-dependent heterogeneity of water flow in sandy soil under grass
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DOI：
10.1515/biolog-2015-0167
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发表时间：
2015-11
期刊：
影响因子：
1.5
通讯作者：
M. Rodný;Ľ. Lichner;Karsten Schacht;L. Holko
中科院分区：
文献类型：
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作者：
M. Rodný;Ľ. Lichner;Karsten Schacht;L. Holko
摘要采用染料示踪入渗试验方法，对草下风成桑迪土壤的非平衡水流进行了研究。进行了20 mm和70 mm雨水入渗模拟试验。采用改进的数字图像分析技术，从染色土壤剖面中估算有效截面（ECS）和优先流程度（DPF），分析ECS和DPF参数的深度依赖性和变化规律。结果表明，草下桑迪土壤水流的非均匀性随深度的增加而增加。两种累积入渗条件下，非均质参数极值（ECS最小值和DPF最大值）几乎相同，且非均质参数极值出现的深度随累积入渗量的增加而增加。此外，相当大的变化的入渗模式被确定在连续的垂直截面。
Abstract The non-equilibrium water flow was studied on an aeolian sandy soil under grass using the dye tracer infiltration experiments. Two experiments simulating infiltration of 20 mm and 70 mm of rain water were conducted. The improved digital image analysis technique for estimating the effective cross section (ECS) and degree of preferential flow (DPF) from stained soil profiles was used to analyze the depth dependency and variation of the ECS and DPF parameters. It was found that the heterogeneity of water flow in sandy soil under grass increased with depth. Extremes of heterogeneity parameters (minimum value of the ECS and maximum value of the DPF) were almost the same for the two cumulative infiltrations, and the depth, in which the extremes of heterogeneity parameters occurred, increased with an increase in cumulative infiltration. Moreover, considerable variation of infiltration patterns was indentified in consecutive vertical sections.