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首页> 外文期刊>Irrigation and Drainage >INFLUENCE OF AGRICULTURE ON SOIL WATER QUALITY IN THE KARST REGION OF LITHUANIA
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INFLUENCE OF AGRICULTURE ON SOIL WATER QUALITY IN THE KARST REGION OF LITHUANIA

机译：立陶宛喀斯特地区农业对土壤水质的影响

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摘要

This article presents the results of studies on lysimeters and drainage carried out in the karst zone of Lithuania. The studies included the estimation of the changes of water quality in a soil profile of moraine loam and sandy loam soils in respect of the land usage and fertilization intensity. Fluctuations of N-NO_3 concentrations contained in soil water mainly depend on N losses through the yield (r~2 = 0.78). The highest N concentrations (up to 28.7 mg l~(-1)) were observed in the fields where potatoes were grown; six times lower N concentrations occurred in the fields of barley with undercrop and the lowest N concentrations (up to 5.1 mg l~(-1)) were determined in fields of perennial grass. This was because N losses with the yield of potatoes are 1.7-2.0 times less than its losses with barley and even 3.0—4.5 times less than N losses with perennial grass, Efficient application of fertilizers results in decreased N-NO_3 and TP concentrations contained in soil water (r~2 = 0.27-0,56 and r~2 = 018-0.57 respectively). Compared to the field of perennial grass, the arable land contained even 9 times higher N-NO_3 concentrations and 2,6 times lower TP concentrations in the whole soil profile. However, when migrating into deeper soil layers in arable land, N-NO_3 concentrations decrease, while in the field of perennial grass the lowest N-NO_3 concentrations occur in the root zone of plants. TP concentrations tend to decrease in deeper soil layers in arable land as well as in the field of perennialgrass. The selection of proper land use in studied soils is a particularly important factor In order to reduce N-NO_3 leaching, the area of perennial grass might be increased, however this may result in higher TP concentrations. Moreover, it is precarious to leave tilled land for the period abundant in water (winter and spring).
机译：本文介绍了在立陶宛喀斯特地区进行溶渗仪和排水的研究结果。研究包括根据土地利用和施肥强度估算冰m壤土和沙壤土土壤剖面中水质的变化。土壤水中N-NO_3浓度的波动主要取决于氮素通过产量的流失（r〜2 = 0.78）。在种植马铃薯的田地中观察到最高的氮浓度（高达28.7 mg l〜（-1））。在有大麦的大麦田中，氮含量降低了六倍，而多年生草田中的最低氮含量（最高为5.1 mg l〜（-1））被确定。这是因为马铃薯产量中的氮素损失比大麦的氮素损失少1.7-2.0倍，甚至比多年生草的氮素损失少3.0-4.5倍，肥料的有效施用会减少马铃薯中的N-NO_3和TP浓度土壤水（r〜2 = 0.27-0,56和r〜2 = 018-0.57）。与多年生草田相比，在整个土壤剖面中，耕地的N-NO_3浓度高出9倍，TP浓度低2.6倍。但是，当移入耕地中较深的土壤层时，N-NO_3浓度会降低，而在多年生草田中，最低的N-NO_3浓度会出现在植物的根部区域。在耕地和多年生草田中，更深层的土壤中TP浓度趋于降低。在研究过的土壤中选择合适的土地利用是一个特别重要的因素。为了减少N-NO_3的淋溶，多年生草的面积可能会增加，但这可能会导致较高的TP浓度。此外，将耕地留在水分丰富的时期（冬季和春季）是不稳定的。

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