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Benthic nutrient fluxes and limited denitrification in a sub-tropical groundwater-influenced coastal lagoon

机译：受亚热带地下水影响的沿海泻湖中的底栖营养通量和有限的反硝化作用

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摘要

Benthic processes in estuarine systems can alleviate nutrient over-enrichment by removing nitrogen (N) via denitrification, or further intensify eutrophication by supplying N back to the water column. The main objectives of this study were to (1) examine the magnitude and sea-sonality of benthic fluxes and denitrification, and (2) determine the relative importance of benthic versus submarine groundwater discharge (SGD) N fluxes in Little Lagoon, a shallow, sub-tropical, groundwater-influenced coastal lagoon in the North Central Gulf of Mexico. In the summer, when low water column nitrate (NO_3~-) concentration (＜0.2 μM) occurred in tandem with high hydrogen sulfide concentration (＞3000 μM), rates of net N_2 fixation (61.7 ± 4.5 SE μmol N m~(-2) h~(-1)) exceeded rates of net N_2 efflux (51.6 ± 4.9 SE umol N m~(-2) h~(-1)). Unlike many estuarine systems where denitrification is coupled to nitrification, sulfidic sediments caused denitrification to primarily be supported by water column NO_3~- in Little Lagoon. Gene copy numbers indicated that markers for N_2 fixation, sulfate reduction, and dissimilatory nitrate reduction to ammonium were more abundant than markers for denitrification and nitrification. SGD N fluxes were up to 42 times larger than the benthic rates, and both the benthos and SGD provided dissolved organic nitrogen to the water column. This study presents evidence of limited benthic N fluxes in supplying N to the water column compared to input associated with SGD.
机译：河口系统中的底栖生物过程可通过反硝化作用去除氮（N）来减轻养分过富，或通过将N供给水柱进一步增强富营养化。这项研究的主要目的是（1）研究底栖通量和反硝化的强度和季节变化，以及（2）确定在小泻湖（浅水区）底栖与海底地下水排放（SGD）N通量的相对重要性。墨西哥北部中部海湾的亚热带，受地下水影响的沿海泻湖。夏季，当低水柱硝酸盐（NO_3〜-）浓度（＜0.2μM）与高硫化氢浓度（＞ 3000μM）串联发生时，净N_2固定率（61.7±4.5 SEμmolN m〜（-） 2）h〜（-1））超过净N_2流出率（51.6±4.9 SE umol N m〜（-2）h〜（-1））。与许多反硝化与硝化作用相结合的河口系统不同，硫化物沉积物导致的反硝化作用主要由Little Lagoon中的NO_3〜-水柱支撑。基因拷贝数表明，N_2固定，硫酸盐还原和异化硝酸盐还原为铵的标记比反硝化和硝化标记更丰富。 SGD N通量最多是底栖生物量的42倍，而Benthos和SGD都向水柱提供了溶解的有机氮。这项研究提供了证据，与SGD相关的投入相比，向水柱供应N的底栖N通量有限。

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  • 来源
    《Marine ecology progress series》 |2014年第14期|13-26|共14页
  • 作者

    Rebecca J. Bernard; Behzad Mortazavi; Lei Wang; Alice C. Ortmann; Hugh MacIntyre; William C. Burnett;

  • 作者单位

    The Dauphin Island Sea Lab, 101 Bienville Blvd. Dauphin Island, Alabama 36528, USA,Department of Biological Sciences, University of Alabama, Tuscaloosa, Alabama 35487, USA;

    The Dauphin Island Sea Lab, 101 Bienville Blvd. Dauphin Island, Alabama 36528, USA,Department of Biological Sciences, University of Alabama, Tuscaloosa, Alabama 35487, USA;

    The Dauphin Island Sea Lab, 101 Bienville Blvd. Dauphin Island, Alabama 36528, USA,Department of Marine Sciences, University of South Alabama, Mobile, Alabama 36688, USA;

    The Dauphin Island Sea Lab, 101 Bienville Blvd. Dauphin Island, Alabama 36528, USA,Department of Marine Sciences, University of South Alabama, Mobile, Alabama 36688, USA;

    Department of Oceanography, Dalhousie University, Nova Scotia B3H 4R2, Canada;

    Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, Florida 32306, USA;

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  • 正文语种 eng
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  • 关键词

    Nitrogen cycle; Denitrification; Benthic flux; Sediment; Hydrogen sulfide; Submarine groundwater discharge;

    机译：氮循环;反硝化;底流沉淀;硫化氢;海底地下水排放;

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