Water policy effectiveness: 30 years of change in the hypernutrified Colne estuary, England.

Water policy effectiveness: 30 years of change in the hypernutrified Colne estuary, England.
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水政策有效性:英国高营养科恩河口 30 年的变化。

DOI:
10.1016/j.marpolbul.2014.01.018
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发表时间:
2014
影响因子:
5.8
通讯作者:
McMellor S
McMellor S
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
McMellor S

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废水排放和农业径流造成营养物富集,导致全世界受纳沃茨的富营养化。分析了30年的数据集(1981年至2010年)的科尔恩河口,在英格兰东南部的富营养化河口,揭示了显着减少营养浓度的淡水输入和沿着河口梯度与管理行动。DIN浓度下降,主要是由于减少氨输出从科尔切斯特污水处理厂和减少硝酸盐负荷的集水区。磷酸盐浓度的下降是由于改进了STW工艺。在此期间,浮游植物叶绿素a有显着下降。营养物质减少的长期轨迹也强烈影响年际模式的降雨和气候信号(冬季NAO)。标准化的冬季DIN浓度在科尔恩河口显着超过水框架指令良好的状态目标,但河口没有表现出富营养化的症状。
Wastewater discharges and agricultural run-off have caused nutrient enrichment leading to eutrophication, in receiving waters worldwide. Analysis of a 30 year data set (1981–2010) for the Colne estuary, a hypernutrified estuary in the south-east of England, revealed significant reductions in nutrient concentrations in freshwater inputs and along the estuarine gradient linked to management actions. DIN concentrations decreased, mainly as a result of reduced ammonia outputs from Colchester STW and reduced nitrate loads from the catchment. Declines in phosphate concentrations occurred due to improved STW processes. There were significant declines in phytoplankton chlorophyllaover the period. Long-term trajectories of nutrient decreases were also strongly influenced by interannual patterns of rainfall and climatic signals (winter NAO). Standardised winter DIN concentrations in the Colne estuary significantly exceed the Water Framework Directive good status target, but the estuary shows no symptoms of eutrophication.
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