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首页> 外文期刊>Estuarine Coastal and Shelf Science >Setting background nutrient levels for coastal waters with oceanic influences
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Setting background nutrient levels for coastal waters with oceanic influences

机译：设定受海洋影响的沿海水域的背景营养水平

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Nutrient enrichment of coastal water bodies as a result of human activities can lead to ecological changes. As part of a strategy to monitor such changes and detect potential eutrophication, samples were collected during research cruises conducted around the Scottish coast each January over the period 2007-2013. Data were obtained for total oxidised nitrogen (TOxN; nitrite and nitrate), phosphate and silicate, and incorporated into data-driven spatial models. Spatial averages in defined sea areas were calculated for each year in order to study inter-annual variability and systematic trends over time. Variation between some years was found to be significant (p ＜ 0.05) but no evidence was found for any trends over the time period studied. This may have been due to the relatively short time series considered here. Modelled distributions were developed using data from groups of years (2007-2009, 2010-2011 and 2012-2013) and compared to the OSPAR Ecological Quality Objectives (EcoQOs) for dissolved inorganic nitrogen (DIN; the concentration of TOxN and ammonia), the ratio of DIN to dissolved inorganic phosphorous (N/P) and the ratio of DIN to dissolved silicate (N/S). In these three models, TOxN was below the offshore background concentration of 10 μM (12 μM at coastal locations) over more than 50% of the modelled area while N/S exceeded the upper assessment criterion of 2 over more than 50% of the modelled area. In the 2007-2009 model, N/P was below the background ratio (16) over the entire modelled area. In the 2010-2011 model the N/P ratio exceeded the background in 91% of the modelled area but remained below the upper assessment criterion (24). Scottish shelf sea waters were found to be depleted in TOxN relative to oceanic waters. This was not accounted for in the development of background values for the OSPAR EcoQOs so new estimates of these background values were derived. The implications of these results for setting reasonable background nutrient levels when the relationship between oceanic and coastal nutrient compositions is complex are discussed.
机译：人类活动造成的沿海水域营养丰富会导致生态变化。作为监测此类变化并检测潜在富营养化策略的一部分，每年1月在2007-2013年期间，在苏格兰海岸进行的研究航行期间收集了样本。获得了总氧化氮（TOxN；亚硝酸盐和硝酸盐），磷酸盐和硅酸盐的数据，并将其合并到数据驱动的空间模型中。每年计算定义海域的空间平均值，以研究年际变化和随时间变化的系统趋势。几年之间的变化被发现是显着的（p ＜0.05），但是在所研究的时间段内没有发现任何趋势的证据。这可能是由于此处考虑的时间序列相对较短。使用年份（2007-2009年，2010-2011年和2012-2013年）的数据开发了模型分布，并将其与OSPAR溶解性无机氮（DIN； TOxN和氨的浓度）的生态质量目标（EcoQOs）， DIN与溶解无机磷的比率（N / P）和DIN与溶解硅酸盐的比率（N / S）。在这三个模型中，TOxN在超过50％的建模区域内低于10μM的海上本底浓度（沿海位置为12μM），而N / S超过超过50％的建模区域2的上限评估标准区域。在2007年至2009年的模型中，整个模型区域的N / P低于背景比率（16）。在2010-2011年模型中，N / P比率超出了91％的模型面积背景，但仍低于评估上限标准（24）。发现相对于海洋水而言，TOxN中的苏格兰陆架海水已经耗尽。在开发OSPAR EcoQO的背景值时未考虑到这一点，因此得出了这些背景值的新估计值。讨论了当海洋和沿海养分成分之间的关​​系复杂时，这些结果对于设定合理的背景养分含量的意义。

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