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首页> 外文期刊>Soil Science Society of America Journal >Soil Water and Shallow Groundwater Relations in an Agricultural Hillslope
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Soil Water and Shallow Groundwater Relations in an Agricultural Hillslope

机译:农业坡地土壤水与浅层地下水的关系

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Shallow water tables can contribute water for plant use; therefore, plant available water includes not only the water stored in the root zone, but also the water moving up from below the root zone. The purpose of this study was to quantify the amount of water moving upward to the root zone. Automated water content reflectometers were used to monitor soil water content across a landscape in Central Iowa, which had varying shallow water tables. Either manual or automated water table depths were measured. Tipping bucket raingage and eddy covariance evapotranspiration (ET) methods were used to measure rain and evapotranspiration as part of the water balance. Upward water movement ranges were determined from water balance and uncertainties for each component (rain, ET, change in soil water content). In 2006 out of 53 dry days (days that did not have any rain), 37, 43, and 46 d showed net upward flux for shoulder, backslope, and toeslope positions, shown by an uncertainty range that did not overlap zero. In 2007, 37 out of 62 dry days showed net upward flux for the toeslope position. The mean significant net upward flux for dry days was 2.6, 3.2, and 3.1 mm d–1 for the shoulder, backslope, and toeslope positions in 2006, and 2.5 mm d–1 for the toeslope position in 2007. Mean ET on nonrain days was 4.0 and 4.1 mm d–1 in 2006 and 2007. Automated equipment used to develop a water balance approach provided a quantitative approach to estimate net upward soil water flux in agricultural fields.
机译:浅水位可为植物用水提供水;因此, 植物可用水不仅包括存储在 根区中的水,而且还包括从根 区下方向上移动的水。这项研究的目的是量化向上移动到根部区域的 水的量。自动水含量 反射仪用于监测爱荷华州中部具有不同浅水表的景观中的土壤水分。测量了手动或自动地下水位的深度。 倾角提桶和涡流协方差蒸散量 (ET)方法用于测量雨量和蒸散量 as水平衡的一部分。由水分平衡和各组成部分的不确定性 (雨水,ET,土壤含水量的变化)确定水的向上移动范围。 2006年,在53 干旱天(没有雨的日子)中,有37、43和46 d 表现出肩部,后坡和趾坡的净向上通量< sup> 位置,由不重叠 零的不确定范围显示。在2007年的62个干旱日中,有37个干旱日显示了坡脚位置的净向上通量 。干燥天的肩部, 后坡和脚趾位置的平均显着净净通量 为2.6、3.2和3.1 mm d –1 2006年,2007年的坡度位置为2.5 mm d –1 。非雨天的平均ET为 4.0和4.1 mm d –1 在2006年和2007年。用于开发水平衡方法的自动化设备 提供了定量的 方法来估算农业中的土壤净向上通量。 > 字段。

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