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首页> 外文期刊>Environmental Science & Technology >Accounting for Nitrogen Fixation in Simple Models of Lake Nitrogen Loading/Export
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Accounting for Nitrogen Fixation in Simple Models of Lake Nitrogen Loading/Export

机译：在简单的湖泊氮加载/导出模型中考虑固氮

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摘要

Coastal eutrophication, an important global environmental problem, is primarily caused by excess nitrogen and management efforts consequently focus on lowering watershed N export (e.g., by reducing fertilizer use). Simple quantitative models are needed to evaluate alternative scenarios at the watershed scale. Existing models generally assume that, for a specific lake/reservoir, a constant fraction of N loading is exported downstream. However, N fixation by cyanobacteria may increase when the N loading is reduced, which may change the (effective) fraction of N exported. Here we present a model that incorporates this process. The model (Fixation and Export of Nitrogen from Lakes, FENL) is based on a steady-state mass balance with loading, output, loss/retention, and N fixation, where the amount fixed is a function of the N/P ratio of the loading (i.e., when N/P is less than a threshold value, N is fixed). Three approaches are used to parametrize and evaluate the model, including microcosm lab experiments, lake field observations/budgets and lake ecosystem model applications. Our results suggest that N export will not be reduced proportionally with N loading, which needs to be considered when evaluating management scenarios.
机译：沿海富营养化是一个重要的全球性环境问题，其主要原因是氮素过多，管理工作因此集中于降低流域氮的出口（例如，通过减少肥料的使用）。需要简单的定量模型来评估分水岭规模的替代方案。现有模型通常假定，对于特定的湖泊/水库，恒定比例的N负荷被输出到下游。但是，当减少氮含量时，蓝细菌对氮的固定作用可能会增加，这可能会改变氮输出的（有效）比例。在这里，我们提出了一个包含此过程的模型。该模型（湖泊中的氮固定和出口，FENL）基于具有负载，输出，损失/保留和N固定的稳态质量平衡，其中固定量是N / P比的函数。负载（即，当N / P小于阈值时，N是固定的）。三种方法用于参数化和评估模型，包括微观实验室实验，湖泊野外观测/预算和湖泊生态系统模型应用。我们的结果表明，氮的出口量不会与氮的负荷成比例地减少，在评估管理方案时需要考虑这一点。

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  • 来源
    《Environmental Science & Technology》 |2014年第10期|5667-5673|共7页
  • 作者

    Xiaodan Ruan; Frank Schellenger; Ferdi L. Hellweger;

  • 作者单位

    Civil and Environmental Engineering, Northeastern University, Boston, Massachusetts 02115, United States;

    Civil and Environmental Engineering, Northeastern University, Boston, Massachusetts 02115, United States;

    Civil and Environmental Engineering, Northeastern University, Boston, Massachusetts 02115, United States, 400 Snell Engineering Center, 360 Huntington Ave., Boston,MA 02115;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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