...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine Environmental Research >Potential rates and environmental controls of denitrification and nitrous oxide production in a temperate urbanized estuary
【24h】

Potential rates and environmental controls of denitrification and nitrous oxide production in a temperate urbanized estuary

机译：温带城市化河口反硝化和一氧化二氮生产的潜在速率和环境控制

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

Denitrification may play a major role in inorganic nitrogen removal from estuarine ecosystems, particularly in those subjected to increased nitrate and organic matter loads. The Douro estuary (NW Portugal) suffers from both problems: freshwater input of nitrate and organic load from untreated wastewater discharges. To assess how these factors might control sediment denitrification, a 12-month survey was designed. Denitrification potential and nitrous oxide (N2O) production were measured at different locations using the slurry acetylene blockage technique. Denitrification rate ranged from 0.4 to 38 nmol N g~(-1) h~(-1), increasing towards the river mouth following an urban pollution gradient N_2O production, a powerful greenhouse gas implicated on the destruction of the ozone layer, was significantly related with sediment organic matter and accounted for 0.5-47% of the N gases produced. Additional enrichment experiments were consistent with the results found in the environment, showing that sediments from the upper less urban stretch of the estuary, mostly sandy, respond positively to carbon and, inversely, in organic rich sediments from the lower estuary, the denitrification potential was limited by nitrate availability. The obtained results confirmed denitrification as an important process for the removal of nitrate in estuaries. The presence of wastewater discharges appears to stimulate nitrogen removal but also the production of N_2O, a powerful greenhouse gas, exacerbating the N_2O:N_2 ratio and thus should be controlled.
机译：反硝化作用在河口生态系统的无机氮去除中可能起主要作用，尤其是在硝酸盐和有机物负荷增加的生态系统中。杜罗河口（葡萄牙西北部）面临两个问题：未经处理的废水排放中硝酸盐的淡水输入和有机负荷。为了评估这些因素如何控制沉积物的反硝化作用，设计了一个为期12个月的调查。使用淤浆乙炔封堵技术在不同位置测量了反硝化电势和一氧化二氮（N2O）的产生。反硝化率在0.4至38 nmol N g〜（-1）h〜（-1）范围内，随着城市污染梯度N_2O的产生，向河口的反硝化速率逐渐增加，这是一种强大的温室气体，与臭氧层的破坏有关。与沉积物有机质有关，占产生的氮气体的0.5-47％。额外的富集实验与在环境中发现的结果一致，表明来自河口城市较少上段的沉积物（主要是沙质）对碳有正响应，反之，来自河口下部的富含有机物的沉积物的反硝化潜力则很大。受硝酸盐可用性的限制。所得结果证实了反硝化是去除河口硝酸盐的重要过程。废水排放的存在似乎促进了氮的去除，但也促进了N_2O（一种强大的温室气体）的产生，加剧了N_2O：N_2的比例，因此应加以控制。

著录项

  • 来源
    《Marine Environmental Research》 |2010年第5期|p.336-342|共7页
  • 作者

    Catarina Teixeira; Catarina Magalhaes; Rui A.R. Boaventura; Adriano A. Bordalo;

  • 作者单位

    Institute of Biomedical Sciences (ICBAS), University of Porto, Laboratory of Hydrobiology, Largo Prof. Abel Salazar 2, 4009-003 Porto, Portugal,Centre of Marine and Environmental Research (CIIMAR), University of Porto, Rua dos Bragas, 289 4050-123 Porto, Portugal;

    Centre of Marine and Environmental Research (CIIMAR), University of Porto, Rua dos Bragas, 289 4050-123 Porto, Portugal;

    Faculty of Engineering, University of Porto, Department of Chemistry, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;

    Institute of Biomedical Sciences (ICBAS), University of Porto, Laboratory of Hydrobiology, Largo Prof. Abel Salazar 2, 4009-003 Porto, Portugal,Centre of Marine and Environmental Research (CIIMAR), University of Porto, Rua dos Bragas, 289 4050-123 Porto, Portugal;

  • 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
  • 中图分类
  • 关键词

    denitrification; nitrous oxide; nitrate; urban pollution; estuaries; sediments;

    机译：反硝化笑气;硝酸盐城市污染;河口沉积物;

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