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Fingerprinting source contributions to bed sediment-associated organic matter in the headwater subcatchments of the River Itchen SAC, Hampshire, UK

机译:英国汉普郡伊岑河南岸上游水源流域中与床层沉积物相关的有机物的指纹图谱来源贡献

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Excessive accumulation of sediment-associated organic matter in river beds has detrimental impacts on aquatic ecology, including fish. Sediment and source samples were collected from 3 headwater tributaries of the River Itchen, in southern England. Near infrared spectra and bulk stable carbon and nitrogen isotopes were employed as fingerprint properties to quantify the relative contributions from catchment-based (farmyard manures/slurries, damaged road verges, and septic tanks) and channel-based (decaying instream vegetation, watercress farms, and fish farms) sources. The findings suggested that over the duration of the sampling period, the final estimated median relative contributions in the Candover Stream subcatchment were in the order: farmyard measures/slurries 74%>decaying instream vegetation 15%>watercress farms 6%>septic tanks 3%>damaged road verges 2%. For the River Arle subcatchment, corresponding estimated median relative contributions were in the order: watercress farms 40%>farmyard manures/slurries 28%>decaying instream vegetation 21%>fish farms 7%>damaged road verges and septic tanks 2% each. Similar contributions were estimated for the Tichborne Stream subcatchment: watercress farms 36%>farmyard manures/slurries 26%>decaying instream vegetation 26% and damaged road verges and septic tanks at 6% each. These source apportionment estimates will contribute to stakeholder engagement and targeted management interventions.
机译:河床中与沉积物相关的有机物过多积累,对包括鱼类在内的水生生态产生有害影响。沉积物和水源样本是从英格兰南部伊岑河的3个上游支流收集的。利用近红外光谱和整体稳定的碳和氮同位素作为指纹特性,以量化基于集水区(农家粪便/泥浆,受损的道路边缘和化粪池)和基于通道(消融河床植被,豆瓣农场,和养鱼场)资源。研究结果表明,在采样期间,Candover流子汇水区的最终估计中位数相对贡献按以下顺序排列:农家措施/泥浆74%>腐烂河道植被15%>豆瓣农场6%>化粪池3% >损坏的道路接近2%。对于阿尔勒河汇水面积,相应的估计中位数相对贡献顺序为:豆瓣农场40%>农场肥料/泥浆28%>腐烂的河道植被21%>养鱼场7%>道路破损和化粪池各2%。估计Tichborne Stream子汇水面积的贡献相似:豆瓣农场36%>农场肥料/泥浆26%>内河植被减少26%,损坏的道路边缘和化粪池各占6%。这些来源分配估计将有助于利益相关者的参与和有针对性的管理干预。

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