Using chemical, microbial and fluorescence techniques to understand contaminant sources and pathways to wetlands in a conservation site.
Using chemical, microbial and fluorescence techniques to understand contaminant sources and pathways to wetlands in a conservation site.
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DOI：
10.1016/j.scitotenv.2014.12.085
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发表时间：
2015-04
期刊：
影响因子：
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通讯作者：
J. Rhymes;L. Jones;D. Lapworth;D. White;N. Fenner;J. Mcdonald;T. Perkins
中科院分区：
文献类型：
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作者：
J. Rhymes;L. Jones;D. Lapworth;D. White;N. Fenner;J. Mcdonald;T. Perkins
营养物质和粪便污染物可以以多种方式进入湿地系统，对生物和潜在的人类健康都有影响。在这项研究中，我们使用无机化学、溶解有机物(DOM)荧光和大肠杆菌和总大肠菌群(TC)计数技术相结合的方法来研究影响指定的国际保护沙丘地点的污染源和多种途径，该地点周围是农业用地。对河流样品、地下水和沙丘湿地的分析揭示了多条输入途径。这些包括河岸渗漏、径流事件和营养物质从邻近牧场渗入地下水，以及一些现场来源。综合技术表明，进入沙丘系统的非现场养分输入主要来自化肥，表现为较高的硝酸盐浓度和相对较低的类色氨酸富里克比和0.4万亿拉曼单位(RU)。就是你。整个场地记录的大肠菌和TC计数证实了来自现场食草动物的细菌和营养输入的相对较小的来源。河流、地下水和径流输入中的营养物质浓度在场地内衰减，恢复了更健康的地下水营养物质浓度，表明沙丘过滤污染物提供了宝贵的生态系统服务。然而，先前的研究表明，这种养分的输入具有明显的不利生态影响。
Nutrients and faecal contaminants can enter wetland systems in a number of ways, with both biological and potentially human-health implications. In this study we used a combination of inorganic chemistry, dissolved organic matter (DOM) fluorescence andEscherichia coliand total coliform (TC) count techniques to study the sources and multiple pathways of contamination affecting a designated sand dune site of international conservation importance, surrounded by agricultural land. Analysis of stream samples, groundwater and dune slack wetlands revealed multiple input pathways. These included riverbank seepage, runoff events and percolation of nutrients from adjacent pasture into the groundwater, as well as some on-site sources. The combined techniques showed that off-site nutrient inputs into the sand dune system were primarily from fertilisers, revealed by high nitrate concentrations, and relatively low tryptophan-like fulvic-like ratios < 0.4 Raman units (R.U.). TheE. coliand TC counts recorded across the site confirm a relatively minor source of bacterial and nutrient inputs from on-site grazers. Attenuation of the nutrient concentrations in streams, in groundwater and in run-off inputs occurs within the site, restoring healthier groundwater nutrient concentrations showing that contaminant filtration by the sand dunes provides a valuable ecosystem service. However, previous studies show that this input of nutrients has a clear adverse ecological impact.