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首页> 外文期刊>Marine ecology progress series >Denitrification, anammox and nitrate reduction in sediments of the southern Great Barrier Reef lagoon
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Denitrification, anammox and nitrate reduction in sediments of the southern Great Barrier Reef lagoon

机译：大堡礁泻湖南部沉积物中的反硝化，厌氧氨氧化和硝酸盐还原

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摘要

We provide the first reported estimates of anammox activity in tropical continental shelf sediments (southern section of the Great Barrier Reef lagoon; GBRL). The measured contribution of anammox to total N_2 production was up to 70 % but restricted to only 1 of the 4 (2 inshore and 2 offshore) sites assayed. Sediment characteristics (contents of total organic carbon [TOC] and manganese [Mn], C:N ratio) at this site appeared to favour anammox activity and the estimated maximum rate was 4.9 μmol m~(-2) h~(-1). Anammox bacteria may be a significant contributor to N_2 production along the coastal zone of the GBRL. The availability of labile (low C:N) TOC seemed to drive denitrification to completion in the offshore sediments. However, rates of NO_3~- reduction to NH_4~+ at the offshore sites were comparable to or higher than denitrification rates. It was unclear whether dissimilatory or assimilatory processes were responsible for the observed reduction of NO_3~- to NH_4~+ at the offshore sites. At the 2 inshore sites, NO_3~- reduction to NH_4~+ was a larger sink for N_3~- than denitrification. Anammox does exist in the tropical continental shelf sediments of the GBRL and should be studied further to determine its role in larger scale N cycling. The roles of assimilatory and dissimilatory nitrate reduction to ammonium also need to be assessed within the GBRL.
机译：我们提供了热带大陆架沉积物（大堡礁泻湖南部的部分； GBRL）中厌氧氨氧化活性的首次报道。厌氧氨气对总N_2产量的贡献高达70％，但仅限于所分析的4个地点（2个近海和2个近海）中的1个。该部位的沉积物特征（总有机碳[TOC]和锰[Mn]的含量，C：N比）似乎有利于厌氧氨氧化活性，估计最大速率为4.9μmolm〜（-2）h〜（-1） 。厌氧氨氧化细菌可能是GBRL沿海地区N_2产生的重要因素。不稳定（低C：N）TOC的可用性似乎推动了近海沉积物中反硝化作用的完成。然而，近海处NO_3〜-还原为NH_4〜+的速率与反硝化速率相当或更高。目前尚不清楚是异化过程还是同化过程导致了近海站点观测到的NO_3〜-还原为NH_4〜+。在2个近海站点，NO_3〜-还原为NH_4〜+是N_3〜-比反硝化更大的汇。厌氧氨氧化确实存在于GBRL的热带大陆架沉积物中，应进一步研究以确定其在更大范围的氮循环中的作用。同化和异化硝酸盐还原成铵的作用也需要在GBRL中进行评估。

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