• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nature >Denitrification as the dominant nitrogen loss process in the Arabian Sea
【24h】

Denitrification as the dominant nitrogen loss process in the Arabian Sea

机译：反硝化是阿拉伯海的主要氮损失过程

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

Primary production in over half of the world's oceans is limited by fixed nitrogen availability. The main loss term from the fixed nitrogen inventory is the production of dinitrogen gas (N_2) by heterotrophic denitrification or the more recently discovered autotrophic process, anaerobic ammonia oxidation (anammox). Oceanic oxygen minimum zones (OMZ) are responsible for about 35% of oceanic N_2 production and up to half of that occurs in the Arabian Sea. Although denitrification was long thought to be the only loss term, it has recently been argued that anammox alone is responsible for fixed nitrogen loss in the OMZs. Here we measure denitrification and anammox rates and quantify the abundance of denitrifying and anammox bacteria in the OMZ regions of the Eastern Tropical South Pacific and the Arabian Sea. We find that denitrification rather than anammox dominates the N_2 loss term in the Arabian Sea, the largest and most intense OMZ in the world ocean. In seven of eight experiments in the Arabian Sea denitrification is responsible for 87-99% of the total N_2 production. The dominance of denitrification is reproducible using two independent isotope incubation methods. In contrast, anammox is dominant in the Eastern Tropical South Pacific OMZ, as detected using one of the isotope incubation methods, as previously reported. The abundance of denitrifying bacteria always exceeded that of anammox bacteria by up to 7- and 19-fold in the Eastern Tropical South Pacific and Arabian Sea, respectively. Geographic and temporal variability in carbon supply may be responsible for the different contributions of denitrification and anammox in these two OMZs. The large contribution of denitrification to N_2 loss in the Arabian Sea indicates the global significance of denitrification to the oceanic nitrogen budget.
机译：固定氮的供应限制了世界上一半以上海洋的初级生产。固定氮存量中的主要损失项是通过异养反硝化或最近发现的自养过程厌氧氨氧化（anammox）产生的氮气（N_2）。海洋氧气最低限度区（OMZ）约占海洋N_2产量的35％，其中一半发生在阿拉伯海。尽管长期以来一直认为反硝化是唯一的损失术语，但最近有人争辩说，单独的厌氧氨氮是造成OMZ中固定氮损失的原因。在这里，我们测量反硝化和厌氧氨氧化率，并量化东部热带南太平洋和阿拉伯海的OMZ地区的反硝化和厌氧氨氧化细菌的丰度。我们发现，反硝化而不是厌氧氨纶主导着阿拉伯海的N_2损失期，阿拉伯海是世界海洋中最大，最强烈的OMZ。在阿拉伯海进行的八次实验中，有七次进行了反硝化，占总N_2产量的87-99％。使用两种独立的同位素孵育方法可重现反硝化作用的优势。相比之下，如先前报道的那样，使用同位素培养方法之一检测到，厌氧氨氮在热带南部南太平洋OMZ中占主导地位。在东部热带南太平洋和阿拉伯海，反硝化细菌的丰度总是比厌氧氨氧化菌高出多达7倍和19倍。碳供应的地理和时间变化可能是这两个OMZ中反硝化和厌氧氨氮的不同贡献的原因。反硝化对阿拉伯海N_2损失的巨大贡献表明，反硝化对海洋氮预算具有全球意义。

著录项

  • 来源
    《Nature》 |2009年第7260期|78-81|共4页
  • 作者

    B. B. Ward; A. H. Devol; J. J. Rich; B. X. Chang; S. E. Bulow; Hema Naik; Anil Pratihary; A. Jayakumar;

  • 作者单位

    Department of Geosciences, Princeton University, Princeton, New Jersey 08544, USA;

    Department of Oceanography, University of Washington, Seattle, Washington 98195, USA;

    Center for Environmental Studies, Brown University, Providence, Rhode Island 02912, USA;

    Department of Oceanography, University of Washington, Seattle, Washington 98195, USA;

    Department of Geosciences, Princeton University, Princeton, New Jersey 08544, USA;

    National Institute of Oceanography, Dona Paula, Goa 403004, India;

    National Institute of Oceanography, Dona Paula, Goa 403004, India;

    Department of Geosciences, Princeton University, Princeton, New Jersey 08544, USA;

  • 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

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