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首页> 外文期刊>Irrigation and Drainage >THE IMPACT OF LIME ADMIXTURE INTO TRENCH BACKFILL ON THE VARIATION OF PHOSPHORUS IN DRAINAGE OUTFLOW
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THE IMPACT OF LIME ADMIXTURE INTO TRENCH BACKFILL ON THE VARIATION OF PHOSPHORUS IN DRAINAGE OUTFLOW

机译：石灰掺入沟渠回填对排水流量中磷的变化的影响

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摘要

One of the tasks of environmental protection is to achieve good ecological status of water bodies and reduce agricultural non-point pollution. As the drainage outflow may be identified as the leading source of water quality, reduction of nutrient transport through drains is therefore of great importance. The field studies on the impact of lime admixture into trench backfill on the amount of phosphorus contained in drainage outflow were conducted in a site located in south-western Lithuania. Heavy-textured clay loam soils prevailed in the catchment. The site was drained by a composite subsurface drainage system with drain spacing of 16 and 24m. To improve water permeability, drainage trenches were backfilled with soil mixed with 0.6% CaO. Results ofseven-year studies (1999-2005) on water quality are reported in this paper. The significant differences between orthophosphate concentrations in control drainage outflow and the treatments with lime'added into the trench backfill were estimated. In waterof the control drainage these concentrations were found to be 2.8 times higher. A slightly decreasing trend of total phosphorus (r = 0.49) and orthophosphates (r = 0.54) was determined in the stream where drainage water discharged. Annual median phosphorus concentrations have generally remained steady in the outflow of limed drainage treatments. Lime admixture reduces the annual load of total phosphorus and orthophosphate by two and three times respectively, compared with a conventional drainage system.
机译：环境保护的任务之一是实现水体的良好生态状况，减少农业面源污染。由于排水的流出可能被认为是水质的主要来源，因此减少通过排水口的养分传输非常重要。在立陶宛西南部的一个地点进行了对掺入沟槽回填土中的石灰对排水中磷含量的影响的现场研究。流域盛行质地较重的粘土壤土。该场地由排水间距为16和24m的复合地下排水系统排水。为了提高透水性，排水沟中回填了掺有0.6％CaO的土壤。本文报告了七年（1999-2005年）的水质研究结果。估计对照排水中的正磷酸盐浓度与在沟槽回填物中加入石灰的处理之间的显着差异。在对照排水的水中，发现这些浓度高出2.8倍。在排放排水的溪流中，总磷（r = 0.49）和正磷酸盐（r = 0.54）略有下降。在石灰排水处理的流出中，年平均磷浓度通常保持稳定。与传统的排水系统相比，石灰外加剂将总磷和正磷酸盐的年负荷分别降低了两倍和三倍。

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