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Primary consumer stable nitrogen isotones as indicators of nutrient source

机译：初级消费者稳定的氮同位素作为营养源的指标

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摘要

Non-point source loading of nitrogen and phosphorus is a primary cause of eutrophication of inland waters, although the diffuse and variable nature of nutrient inputs makes it difficult to trace and identify nutrient pathways. Stable nitrogen isotope values (delta(15)N) in aquatic biota are thought to reflect anthropogenic nutrient inputs, and they may be a promising tool for tracing nutrient sources in watersheds. We measured delta(15)N of aquatic consumers from a suite of 27 Danish lakes spanning a range of trophic states (oligotrophic to eutrophic) and land uses (forest, urban, agriculture). Primary consumer delta(15)N values (PCdeltaN15) varied more than 14%(0) among lakes. Models Of PCdeltaN15 were developed from limnological, nitrogen loading, and nitrogen source variables using an information-theoretic approach (Akaike's Information Criteria, AIC). Models based on land use/land cover performed best, indicating that elevated delta(15)N is not only associated with high nitrogen loading, but is also reflective of nitrogen source. Urban and agricultural land use in the watershed, and particularly within the riparian buffer areas, was quantitatively linked to elevated biotic delta(15)N.
机译：氮和磷的面源负荷是内陆水域富营养化的主要原因，尽管养分输入的分散性和可变性使其难以追踪和识别养分途径。人们认为水生物区系中稳定的氮同位素值（delta（15）N）反映了人为的养分输入，它们可能是追踪流域养分来源的有前途的工具。我们测量了来自27个丹麦湖泊的水生消费者的delta（15）N，这些湖泊跨越一系列营养状态（贫营养到富营养化）和土地利用（森林，城市，农业）。湖泊之间的主要消费者delta（15）N值（PCdeltaN15）变化超过14％（0）。 PCdeltaN15的模型是使用信息理论方法（Akaike的信息标准，AIC）从物候，氮负荷和氮源变量中开发的。基于土地利用/土地覆盖的模型表现最好，表明升高的delta（15）N不仅与高氮负荷相关，而且还反映了氮源。流域，特别是河岸缓冲区内的城市和农业土地利用，与提高的生物三角洲（15）N数量相关。

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