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首页> 外文期刊>Bioresource Technology: Biomass, Bioenergy, Biowastes, Conversion Technologies, Biotransformations, Production Technologies >Chloride, sodium, potassium and faecal bacteria levels in surface runoff and subsurface percolates from grassland plots amended with cattle slurry
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Chloride, sodium, potassium and faecal bacteria levels in surface runoff and subsurface percolates from grassland plots amended with cattle slurry

机译：用牛粪浆修正的草地地表径流和地下渗滤液中的氯，钠，钾和粪便细菌水平

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This study investigated the effectiveness of vegetated buffer strips for removing contaminants in runoff from grassed plots (slope 15%) after application of cattle slurry. Plots (8 x 8 in 2 or 8 x 3 in 2) received slurry or inorganic fertilizer, and then simulated rainfall (1, 7 and 21 days after slurry/fertilizer application), after each event, runoff and percolates were sampled at various distances downslope (2,4,6, and 8 in), and analysed for Cl-, Na+, K+ and faecal bacteria contents. Contaminant concentrations were markedly higher in runoff from the slurry-amended plots than in runoff from the fertiliser-amended plots. After the first rainfall event, some contaminant concentrations in runoff from the slurry-amended plots declined with distance downslope (i.e. with buffer strip width), supporting the relative efficacy of the strip for retaining pollutants. After the second and third rainfall events, by contrast, our results suggest remobilisation of contaminants retained during the first event. Faecal bacteria levels (especially streptococcus levels) remained high throughout the study, even in percolates and runoff collected 8 m downslope after the third rainfall event, and indeed even downslope of the adjacent fertilizer-amended plots (indicating lateral movement): this suggests that bacterial contamination may be the most significant risk arising from slurry application. (C) 2002 Elsevier Science Ltd. All rights reserved. [References: 47]
机译：这项研究调查了植被缓冲带清除牛粪后去除草场（坡度15％）径流中污染物的有效性。地块（8 x 8 in 2或8 x 3 in 2）接受泥浆或无机肥料，然后模拟降雨（泥浆/肥料施用后1、7和21天），每次事件后，在不同距离处采集径流和渗滤液下坡（2、4、6和8英寸），并分析Cl-，Na +，K +和粪便细菌含量。淤泥改良区的径流中的污染物浓度明显高于肥料改良区的径流。第一次降雨事件发生后，泥浆修正区径流中的某些污染物浓度随距离下降坡度（即缓冲带宽度）而下降，这支持了带材保留污染物的相对功效。相比之下，在第二次和第三次降雨事件之后，我们的结果表明，对第一次事件期间残留的污染物进行了迁移。粪便细菌水平（尤其是链球菌水平）在整个研究过程中保持较高水平，即使在第三次降雨事件发生后8m的下坡收集的渗滤液和径流中，甚至在相邻的肥料改良样地的下坡（指示横向运动）中也是如此：这表明细菌污染可能是浆液应用带来的最重大风险。 （C）2002 Elsevier ScienceLtd。保留所有权利。 [参考：47]

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