...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >Immission targets for nutrients (N and P) in catchments and coastal zones: a North Sea assessment
【24h】

Immission targets for nutrients (N and P) in catchments and coastal zones: a North Sea assessment

机译：流域和沿海地区营养物质（氮和磷）的排放目标：北海评估

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Concern about the rising concentrations of nutrients and their adverse effects on freshwater, estuarine and marine organisms led to political action in 1970s and 1980s. Emission targets, aimed at reducing the load to the aquatic environment, were set. Also, immission targets for the concentration of different nitrogen and phosphorus compounds were set in various countries. Immission targets are the background concentration and the quality objective of nutrients. The background concentration is defined as the concentration that could be found in the environment in the absence of any human activity, The quality objective is based on eco-physiological results and adopted by policymakers in order to minimise the risk of environmental damage. The criteria and nomenclature for targets are ambiguous and inconsistent; different names are used for the targets. Setting target values for nutrients in water bodies that are interconnected in a catchment area is a perilous affair. A wide range in the background concentration and quality objectives for different nitrogen and phosphorus compounds in river and sea water is found between 10 European Union countries around the North Sea. For instance for nitrate the minimum versus maximum difference for the objective is 255 fold. For the coastal waters, a method is proposed that makes it possible to calculate the target at a given salinity. It is recommended that further development of eutrophication targets, should be based on ecological science. Links must be made between the desired ecological target (e.g. chlorophyll concentration) and the chemical target at a catchment level, taking into account that water flows across borders and flows from one place to another.
机译：对营养物浓度增加及其对淡水，河口和海洋生物的不利影响的关注导致了1970年代和1980年代的政治行动。确定了旨在减少水生环境负荷的排放目标。此外，各国还设定了不同氮和磷化合物浓度的排放目标。排放目标是背景浓度和营养素的质量目标。背景浓度定义为在没有任何人类活动的情况下可以在环境中发现的浓度。质量目标是基于生态生理结果并由决策者采用的，目的是将环境破坏的风险降至最低。目标的标准和术语含糊不清且不一致；目标使用不同的名称。为集水区中相互连接的水体中的营养物设定目标值是一件危险的事情。在北海周围的10个欧盟国家之间，发现了河流和海水中不同氮和磷化合物的背景浓度和质量目标的范围很广。例如，对于硝酸盐，物镜的最小与最大差异是255倍。对于沿海水域，提出了一种方法，该方法可以计算给定盐度下的目标。建议进一步发展富营养化目标应以生态科学为基础。考虑到水跨界流动并从一个地方流到另一个地方，必须在流域水平的理想生态目标（例如叶绿素浓度）和化学目标之间建立联系。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号