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首页> 外文期刊>Estuarine Coastal and Shelf Science >Denitrification activity is closely linked to the total ambient Fe concentration in mangrove sediments of Goa, India
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Denitrification activity is closely linked to the total ambient Fe concentration in mangrove sediments of Goa, India

机译：印度果阿的红树林沉积物中的反硝化活性与环境中的总铁浓度密切相关

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摘要

Denitrification activity (DNT) and associated environmental parameters were examined in two mangrove ecosystems of Goa, India - the relatively unimpacted Tuvem and the anthropogenically-infiuenced Divar. Sampling was carried out at every 2 cm interval within the 0-10 cm depth range to determine seasonal (pre-monsoon, monsoon and post-monsoon) down-core variation in DNT assess the environmental factors influencing the DNT and to build predictive models for benthic DNT. Denitrification generally decreased with depth and showed marked seasonal variation at both the locations. Denitrification peaked during the pre-monsoon occurring at a rate of up to 21.00 ± 12.84 nmol N_2O g~(-1) h~(-1) within 0-4 cm at both the locations. Further, DNT at pre-monsoon was significantly influenced by Fe content at Tuvem and Divar suggesting Fe-mediated nitrate respiration. The influence of other limiting substrates such as NO_3~- and NO_2~- was most important during the monsoon and post-monsoon especially at Divar. The multiple regression models developed could predict 67-98% of the observed variability in DNT through the seasons. About 6-9 environmental variables were required to relatively well-predict DNT in these sediments with the complexity governing DNT decreasing from pre-monsoon to post-monsoon. Our results reveal that seasonal dynamics of DNT in tropical mangrove sediments are closely linked to the total Fe at the prevailing ambient concentration in both the systems.
机译：在印度果阿的两个红树林生态系统中对反硝化活性（DNT）和相关的环境参数进行了测试-相对未受影响的Tuvem和人为干扰的Divar。在0-10 cm深度范围内，每隔2 cm进行一次采样，以确定DNT的季节性（季风前，季风和季风后）下核变化，评估影响DNT的环境因素并建立预测模型底栖DNT。反硝化作用通常随深度而降低，并且在两个位置均显示出明显的季节性变化。在这两个位置，季风前的反硝化作用达到峰值，最高速率为21.00±12.84 nmol N_2O g〜（-1）h〜（-1）。此外，季风前的DNT受到Tuvem和Divar处Fe含量的显着影响，表明Fe介导的硝酸盐呼吸作用。在季风和季风后，特别是在迪瓦尔，其他限制基质如NO_3〜-和NO_2〜-的影响最为重要。所开发的多元回归模型可以预测整个季节DNT观测到的变异的67-98％。相对较好地预测这些沉积物中的DNT需要大约6-9个环境变量，而控制DNT的复杂性从季风前到季风后降低。我们的研究结果表明，热带红树林沉积物中DNT的季节动态与两个系统中主要环境浓度下的总Fe密切相关。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2013年第10期|64-74|共11页
  • 作者

    Sheryl Oliveira Fernandes; Maria-Judith Gonsalves; Valerie D. Michotey; Patricia C. Bonin; P. A. LokaBharathi;

  • 作者单位

    Biological Oceanography Division, CSIR - National Institute of Oceanography, Dona Paula, Goa 403004, India;

    Biological Oceanography Division, CSIR - National Institute of Oceanography, Dona Paula, Goa 403004, India;

    Aix-Marseille Univ., Mediterranean Institute of Oceanography (MIO), 13288 Marseille cedex 09, France,Universite du Sud Toulon-Var, MIO, 83957, CNRS/INSU, MIO UMR 7294, IRD, MIO UMR235, La Garde cedex 83957, France;

    Aix-Marseille Univ., Mediterranean Institute of Oceanography (MIO), 13288 Marseille cedex 09, France,Universite du Sud Toulon-Var, MIO, 83957, CNRS/INSU, MIO UMR 7294, IRD, MIO UMR235, La Garde cedex 83957, France;

    Biological Oceanography Division, CSIR - National Institute of Oceanography, Dona Paula, Goa 403004, India;

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  • 正文语种 eng
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  • 关键词

    denitrification; denitrifiers; iron; mangroves; nitrogen; sediments;

    机译：反硝化反硝化剂铁;红树林;氮;沉积物;

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