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首页> 外文期刊>Soil Science Society of America Journal >Comparison of Soil Physical Properties under Two Different Water Table Management Regimes
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Comparison of Soil Physical Properties under Two Different Water Table Management Regimes

机译：两种不同水位管理制度下土壤物理性质的比较

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摘要

Soil physical properties are important indicators of the potential for agricultural production. The objective of this research was to examine the difference in soil physical properties 9 yr after the initiation of two water table management (WTM) treatments in Wood County, Ohio. Water table management treatments included both unrestricted subsurface drainage year round (Drainage Treatment) and subirrigation during the crop-growing season to maintain the water table at 25 cm below the surface with unrestricted subsurface drainage the remainder of the year (Subirrigation Treatment). Soil samples were collected in eight plots, in six depth increments to a 1-m depth. Soil aggregation and related properties were significantly different in response to WTM treatments and soil depths. The subirrigated treatment had lower aggregate stability at 40 to 50 cm compared with the drainage treatment. The mean weight diameter (MWD) and geometric mean diameter (GMD) of aggregates in the subirrigated treatment were smaller than the drainage treatment at depths of 30 to 75 cm. Percentage of macroaggregates and aggregate ratios were generally lower in the subirrigation treatment than the drainage treatment. Subirrigated soils exhibited relatively lower bulk density with an associated increase in total porosity. The drainage treatment had greater penetration resistance from 30 to 45 cm on readings taken in Spring 2000. Subirrigated soils retained a greater volume of moisture at all matric potentials except –0.00015 and –1.5 MPa. The subirrigated soils are apparently not able to develop large, stable aggregates as seen in the continuously drained soil, perhaps because of the frequent water saturation followed by slaking of soil macroaggregates associated with subirrigation.
机译：土壤物理性质是农业生产潜力的重要指标。这项研究的目的是调查在开始实施两个地下水位管理（WTM） 处理后9 yr土壤物理性质的差异。俄亥俄州伍德县。地下水管理措施 包括全年无限制地下排水（Drainage Treatment）和作物生长季节的地下灌溉 在一年中剩余的时间里，在地面以下25厘米处进行 不受限制的地下排水（Subirrigation 处理）。在八个样地中以六个 深度增量到1-m深度收集土壤样品。 WTM处理 和土壤深度对土壤聚集和相关 特性的影响显着不同。与排水处理相比，地下灌溉处理在40至50 cm处的集料 稳定性较低。 平均重物直径（MWD）和几何平均直径（GMD） <在30到75 cm的深度下，地下灌溉处理中的/ sup小于集水处理的 。灌水处理中大骨料的百分比 和骨料比率通常低于排水处理。 灌水土壤的堆密度相对较低， 总孔隙率的增加。排水处理 在2000年春季获得的读数 具有更大的渗透阻力，从30厘米增加到45厘米。地下灌溉的土壤保留了更大的水分含量除–0.00015 和–1.5 MPa以外的其他基体电位。如在连续 排水的土壤中所见，显然，地下灌溉的土壤不能 发展出大的，稳定的聚集体，这可能是由于以下常见的水饱和度 通过蒸煮与 灌溉相关的土壤大团聚体。

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