Anaerobic ammonium oxidation in deep-sea sediments off the Washington margin
Anaerobic ammonium oxidation in deep-sea sediments off the Washington margin
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DOI：
10.4319/lo.2009.54.5.1643
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发表时间：
2009-09-01
影响因子：
4.5
通讯作者：
Devol, Allan H.
中科院分区：
文献类型：
--
作者：
Engstrom, Pia;Penton, C. Ryan;Devol, Allan H.
通过对从卡斯卡迪亚盆地（北太平洋东部）八个地点 2800-3100 米水深收集的低氧沉积物进行 (15)N 修正，研究了厌氧氨氧化 (anammox) 对深层大陆边缘沉积物脱氮的重要性。与来自深层大陆边缘沉积物的早期数据一致，无机氮的孔隙水分布表明NH(4)(+)从低氧带沉积物中去除，可能是由于与硝酸盐的反应。根据与 (15)N 标记底物的低氧沉积物孵育估算的厌氧氨氧化速率范围在 0.065 至 1.7 nmol N mL(-1) h(-1)（湿沉积物）之间，这表明厌氧氨氧化是观察到的 NH(4)(+) 去除的原因。 NH(4)(+)和NO(3)(-)孔隙水剖面的厌氧氨氧化和反硝化速率分别为32-82 μ mol N m(-2) d(-1)和50-110 μ mol N m(-2) d(-1)。厌氧氨氧化对总 N(2) 产生的平均贡献为 40%（(15)N 修正的沉积物孵化）至 42%（来自孔隙水无机 N 的通量），这不支持早期的报告，即厌氧氨氧化的相对重要性随着水深的增加而增加，因此在深度大于 1000 m 时应主导反硝化。
The significance of anaerobic ammonium oxidation (anammox) for nitrogen removal in deep continental margin sediments was studied with (15)N amendments to suboxic sediments collected from 2800-3100-m water depth at eight sites in the Cascadia Basin (eastern North Pacific Ocean). Consistent with earlier data from deep continental margin sediments, pore-water distributions of inorganic N indicated NH(4)(+) removal from suboxic zone sediments, likely due to reaction with nitrate. Anammox rates estimated from suboxic sediment incubations with (15)N-labled substrates ranged between 0.065 and 1.7 nmol N mL(-1) h(-1) (wet sediment), which suggested that anammox was responsible for the observed NH(4)(+) removal. Anammox and denitrification rates derived from NH(4)(+) and NO(3)(-) pore-water profiles were 32-82 mu mol N m(-2) d(-1) and 50-110 mu mol N m(-2) d(-1), respectively. The average contribution of anammox to total N(2) production was 40% ((15)N-amended sediment incubations) to 42% (flux from pore-water inorganic N), which does not support earlier reports that suggested that the relative importance of anammox increased with water depth and thereby should dominate over denitrification at depths greater than 1000 m.