Depth distribution of simulated urine in a range of soils soon after deposition
Depth distribution of simulated urine in a range of soils soon after deposition
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沉积后不久模拟尿液在一系列土壤中的深度分布
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
B. Addison
中科院分区：
文献类型：
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作者：
R. Monaghan;P. Carey;A. Metherell;P. Singleton;J. Drewry;B. Addison
通过在土壤表面以0.2升s - 1的速率施用2升KBr - pyranine染料溶液，在沉积后6小时内测量土壤中模拟牛尿的溶液分布，然后以10厘米的深度对尿液影响区域进行挖掘和次采样，直到在紫外荧光下无法检测到进一步的pyranine染料。在10个土壤中，有9个土壤出现了模拟牛尿优先流向20厘米以下土壤深度的现象。高达68%的施用溶液移动到20厘米以下，在所有土壤中平均为17%。两种土壤表现出高度的优先流，将它们从数据中排除后，平均损失减少到11%。尽管这种优先流是显著的，但通过优先流移动的大部分尿液营养物质仍可被植物根部在深处吸收，因此不能被认为是牧场的损失。在土壤深度为20 cm或30 cm以下的土壤中，用饱和水力学方法预测尿液的运动效果最好。
Abstract The distribution of a solution simulating cow urine in soil was measured within 6 hours of deposition, by applying 2 litres of KBr‐pyranine dye solution to the soil surface at a rate of 0.2 litres s−1, followed by excavation and sub‐sampling of the area affected by urine in 10‐cm depth increments until no further pyranine dye could be detected under UV fluorescence. Preferential flow of simulated cow urine to below 20 cm soil depth occurred in 9 of the 10 soils examined. Up to 68% of applied solution moved below 20 cm, at an average of 17% over all soils examined. Two soils exhibited a high degree of preferential flow and excluding these from the data reduced the average loss to 11%. Although this preferential flow was significant, much of the urine nutrients moving via preferential flow would still be available for uptake by plant roots at depth, and therefore cannot be considered a loss to pasture. The movement of urine to below 20 or 30 cm soil depth was best predicted by saturated hydraulic c...