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An investigation of localised soil heterogeneities on solute transport using a multisegement percolation system

机译:利用多段渗流系统研究溶质运移过程中局部土壤异质性

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Abstract A multisegment percolation system (MSPS) consisting of 25 individual collection wells was constructed to study the effects of localised soil heterogeneities on the transport of solutes in the vadose zone. In particular, this paper discusses the transport of water and nutrients (NO3 _, Cl?, PO4 3‐) through structurally stable, free‐draining agricultural soil from Victoria, Australia. A solution of nutrients was irrigated onto the surface of a large undisturbed soil core over a 12‐h period. This was followed by a continuous irrigation of distilled water at a rate which did not cause ponding for a further 18 days. During this time, the volume of leachate and the concentration of nutrients in the leachate of each well were measured. Very significant variation in drainage patterns across a small spatial scale was observed. Leaching of nitrate‐nitrogen and chloride from the core occurred two days after initial application. However, less than 1% of the total applied phosphate‐phosphorus leached from the...
机译:摘要建立了由25个单独的采集井组成的多段渗流系统(MSPS),研究局部土壤异质性对渗流带溶质运移的影响。特别是,本文讨论了通过结构稳定,排水良好的澳大利亚维多利亚州的农业土壤来输送水和养分(NO3 _,Cl2,PO4 3-)。在12小时的时间内,将营养液注入大面积未扰动的土壤核心表面。随后以连续18天不造成积水的速率连续冲洗蒸馏水。在这段时间内,测量每个孔的渗滤液的体积和营养物的浓度。在较小的空间范围内,观察到排水模式的变化非常明显。初次施涂两天后,岩心中的硝态氮和氯化物浸出。然而,从磷矿中浸出的磷-磷总量不到1%。

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