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首页> 外文期刊>Estuarine Coastal and Shelf Science >Coastal water column ammonium and nitrite oxidation are decoupled in summer
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Coastal water column ammonium and nitrite oxidation are decoupled in summer

机译：夏季，沿海水柱铵和亚硝酸盐的氧化解耦

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Water column nitrification is a key process in the nitrogen cycle as it links reduced and oxidized forms of nitrogen and also provides the substrate (nitrate) needed for reactive nitrogen removal by denitrification. We measured potential water column ammonium and nitrite oxidation rates at four sites along an estuary to continental shelf gradient over two summers. In most cases, nitrite oxidation rates outpaced ammonium oxidation rates. Overall, ammonium and nitrite oxidation rates were higher outside of the estuary, and this trend was primarily driven by higher oxidation rates in deeper waters. Additionally, both ammonium and nitrite oxidation rates were impacted by different in situ variables. Ammonium oxidation rates throughout the water column as a whole were most positively correlated to depth and salinity and negatively correlated to dissolved oxygen and light. In contrast, nitrite oxidation rates throughout the water column were negatively correlated with light and pH. Multivariate regression analysis revealed that while both surface (<20 m) and deep (>20 m) ammonium oxidation rates were most strongly predicted by depth and light, surface rates were also regulated by salinity and deep rates by temperature. Surface (<20 m) nitrite oxidation rates were best explained by [H+] (i.e. pH) alone, while salinity, [H+], temperature, and depth all played a role in predicting deep (>20 m) nitrite oxidation rates. These results support the growing body of evidence that ammonium oxidation and nitrite oxidation are not always coupled, should be measured separately, and are influenced by different environmental conditions. (C) 2016 Elsevier Ltd. All rights reserved.
机译：水柱硝化是氮循环中的关键过程，因为它链接了还原和氧化形式的氮，并且还提供了通过反硝化去除反应性氮所需的底物（硝酸盐）。我们在两个夏季沿河口至大陆架梯度的四个位置测量了潜在的水柱铵和亚硝酸盐氧化速率。在大多数情况下，亚硝酸盐的氧化速率超过铵的氧化速率。总体而言，河口外的铵和亚硝酸盐氧化速率较高，而这一趋势主要是由深水区较高的氧化速率所驱动。此外，铵和亚硝酸盐的氧化速率都受到不同的原位变量的影响。整个水柱中的铵氧化速率总体上与深度和盐度呈正相关，与溶解氧和光呈负相关。相反，整个水柱中的亚硝酸盐氧化速率与光和pH呈负相关。多元回归分析显示，虽然深度和光能最强烈地预测表面（<20 m）和深度（> 20 m）的铵氧化速率，但表面速率也受盐度和深度速率的调节。仅用[H +]（即pH）可以最好地解释表面（<20 m）的亚硝酸盐氧化速率，而盐度，[H +]，温度和深度都可以预测深（> 20 m）的亚硝酸盐氧化速率。这些结果支持了越来越多的证据表明，铵氧化和亚硝酸盐氧化并不总是耦合的，应该分别进行测量，并受不同环境条件的影响。 （C）2016 Elsevier Ltd.保留所有权利。

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