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首页> 外文期刊>The Science of the Total Environment >Organic matter decomposition sustains sedimentary nitrogen loss in the Pearl River Estuary, China
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Organic matter decomposition sustains sedimentary nitrogen loss in the Pearl River Estuary, China

机译：有机物分解在中国珠江口中维持沉积氮损失

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The Pearl River Estuary (PRE) has long received tremendous amounts of anthropogenic nitrogen, and is facing severe environmental problems. Denitrification and anaerobic ammonium oxidation (anammox) are known to be two major nitrogen removal pathways in estuarine sediments. Through the use of slurry and intact sediment core incubations, we examined the nitrogen removal pathways and quantified the in situ denitrification and anammox with associated gaseous nitrogen production rates. Sedimentary nitrogen removal was predominated by denitrification (93-100%) relative to a minimal contribution (7%) from anammox. Among the detected environmental factors, salinity, bottom water NOx- (nitrate and nitrite) concentration, sedimentary organic matter and dissolved oxygen consumption rates showed good correlations with denitrification and anammox rates. Sedimentary nitrogen loss was mainly supported by endogenic coupled nitrification-denitrification (6.0 +/- 1.5 x 10(6) mol N d(-1)), with water-column-delivered NOx- (2.1 +/- 0.6 x 10(6) mol N d(-1)) as the secondary source. Such results suggested that sedimentary nitrogen removal involved mainly particulate organic form (allochthonous or autochthonous) deposited onto sediments, rather than inorganic forms in overlying water. Meanwhile, total N2O production from sediments was estimated to be 7.3 +/- 2.1 x 10(4) mol N d(-1), equivalent to similar to 35% of the daily N2O emissions in the PRE. (C) 2018 Elsevier B.V. All rights reserved.
机译：珠江口（前）长期接受了大量的人为氮，并面临着严重的环境问题。已知反硝化和厌氧氧化铵氧化（厌氧氧化铵氧化（厌氧毒素）是偏卤素沉积物中的两个主要氮去除途径。通过使用浆料和完整的沉积物核心孵育，我们检查了氮去除途径，并用相关的气态氮生产率定量了原位反硝化和厌氧毒素。沉积氮去除通过反硝化（93-100％）相对于来自厌氧毒素的最小贡献（<7％）占主导地位。在检测到的环境因素，盐度，底部水NOx-（硝酸盐和亚硝酸盐）浓度，沉积有机物和溶解的氧气消耗率与反硝化和厌氧速率良好的相关性显示出良好的相关性。沉积氮损失主要由内源性偶联 - 硝化硝化（6.0 +/- 1.5×10（6）摩尔N d（-1））负载，用水柱输送的NOx-（2.1 +/- 0.6×10（6 ）Mol N D（-1））作为二次来源。这些结果表明，沉积氮去除主要涉及沉积在沉积物上的颗粒状有机形式（表从加工或自加湿），而不是在覆盖水中的无机形式。同时，沉积物的总N2O生产估计为7.3 +/- 2.1×10（4）摩尔N d（-1），相当于预先存在的每日N2O排放量的35％。 （c）2018年elestvier b.v.保留所有权利。

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