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首页> 外文期刊>Environmental Science & Technology >Connecting the Dots: Responses of Coastal Ecosystems to Changing Nutrient Concentrations
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Connecting the Dots: Responses of Coastal Ecosystems to Changing Nutrient Concentrations

机译：连接点：沿海生态系统对营养物浓度变化的响应

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摘要

Empirical relationships between phytoplankton biomass and nutrient concentrations established across a wide range of different ecosystems constitute fundamental quantitative tools for predicting effects of nutrient management plans. Nutrient management plans based on such relationships, mostly established over trends of increasing rather than decreasing nutrient concentrations, assume full reversibility of coastal eutrophication. Monitoring data from 28 ecosystems located in four well-studied regions were analyzed to study the generality of chlorophyll a versus nutrient relationships and their applicability for ecosystem management. We demonstrate significant differences across regions as well as between specific coastal ecosystems within regions in the response of chlorophyll a to changing nitrogen concentrations. We also show that the chlorophyll a versus nitrogen relationships over time constitute convoluted trajectories rather than simple unique relationships. The ratio of chlorophyll a to total nitrogen almost doubled over the last 30-40 years across all regions. The uniformity of these trends, or shirting baselines, suggest they may result from large-scale changes, possibly associated with global climate change and increasing human stress on coastal ecosystems. Ecosystem management must, therefore, develop adaptation strategies to face shifting baselines and maintain ecosystem services at a sustainable level rather than striving to restore an ecosystem state of the past.
机译：在广泛的不同生态系统中建立的浮游植物生物量与养分浓度之间的经验关系构成了预测养分管理计划效果的基本定量工具。基于这种关系的养分管理计划（主要是根据养分浓度增加而不是减少的趋势确定的）假定了沿海富营养化的完全可逆性。分析了来自四个研究好的区域的28个生态系统的监测数据，以研究叶绿素a与养分关系的普遍性及其在生态系统管理中的适用性。我们证明了叶绿素a对变化的氮浓度的响应在区域之间以及区域内特定沿海生态系统之间存在显着差异。我们还表明，随着时间的推移，叶绿素a与氮的关系构成了回旋的轨迹，而不是简单的独特关系。在过去的30-40年中，所有地区的叶绿素a与总氮之比几乎翻了一番。这些趋势的统一性或折衷基准表明，它们可能是由大规模变化导致的，可能与全球气候变化和人类对沿海生态系统的压力不断增加有关。因此，生态系统管理必须制定适应战略，以面对不断变化的基准，并将生态系统服务维持在可持续的水平，而不是努力恢复过去的生态系统状态。

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  • 来源
    《Environmental Science & Technology》 |2011年第21期|p.9122-9132|共11页
  • 作者

    Jacob Carstensen; Maria Sanchez-Camacho; Carlos M. Duarte; Dorte Krause-Jensen; Nuria Marba;

  • 作者单位

    Department of Bioscience, Aarhus University, Frederiksborgvej 399, DK-4000 Roskilde, Denmark;

    Department of Bioscience, Aarhus University, Frederiksborgvej 399, DK-4000 Roskilde, Denmark;

    Department of Bioscience, Aarhus University, Frederiksborgvej 399, DK-4000 Roskilde, Denmark,The UWA Oceans Institute, University of Western Australia, 35 Stirling Highway, Crawley 6009, Australia;

    Department of Bioscience, Aarhus University, Frederiksborgvej 399, DK-4000 Roskilde, Denmark;

    Department of Global Change Research, IMEDEA (CSIC-UIB), Instituto Mediterraneo de Estudios Avanzados, Miquel Marques 21,07190 Esporles (Ules Balears), Spain;

  • 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);
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