Nitrification and inorganic nitrogen distribution in a large perturbed river/estuarine system: the Pearl River Estuary, China
Nitrification and inorganic nitrogen distribution in a large perturbed river/estuarine system: the Pearl River Estuary, China
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大型扰动河流/河口系统中的硝化作用和无机氮分布：中国珠江口
DOI：
10.5194/bg-5-1227-2008
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发表时间：
2008-01-01
期刊：
影响因子：
4.9
通讯作者：
Kao, S. -J.
中科院分区：
文献类型：
--
作者：
Dai, M.;Wang, L.;Kao, S. -J.
抽象的。我们通过冬季（2005年1月）、夏季（2005年8月）和春季（2006年3月）的3次巡航，调查了珠江口这个大型扰动河口溶解无机氮的空间分布和季节变化。还进行了现场培养以确定铵和亚硝酸盐的氧化速率（硝化速率）。我们观察到，在盐度 ~0-5 的上河口，全年 NH4+ 急剧减少，NO3− 增加，但 NO2− 变化不显着。但河口上游无机氮的种类和浓度随季节变化显着。冬季，径流较少，珠江口最上游的氨氧化率（0~5.4 μmol N L−1 d−1）和亚硝酸盐氧化率（0~5.2 μmol N L−1 d−1）相对较低，氨氮（高达>800 μmol L−1）和硝酸盐（高达>300 μmol L−1）浓度极高。夏季，河口上游表现出较高的硝化速率（氨氧化速率~1.5–33.1 μmol N L−1 d−1，亚硝酸盐氧化速率~0.6–32.0 μmol N L−1 d−1），氨浓度较低（
Abstract. We investigated the spatial distribution and seasonal variation of dissolved inorganic nitrogen in a large perturbed estuary, the Pearl River Estuary, based on three cruises conducted in winter (January 2005), summer (August 2005) and spring (March 2006). On-site incubation was also carried out for determining ammonium and nitrite oxidation rates (nitrification rates). We observed a year-round pattern of dramatic decrease in NH4+, increase in NO3−, but insignificant change in NO2− in the upper estuary at salinity ~0–5. However, species and concentrations of inorganic nitrogen at upper estuary significantly changed with season. In winter, with low runoff, the most upper reach of the Pearl River Estuary showed relatively low rates of ammonia oxidation (0–5.4 μmol N L−1 d−1) and nitrite oxidation (0–5.2 μmol N L−1 d−1), accompanied by extremely high concentrations of ammonia (up to >800 μmol L−1) and nitrate (up to >300 μmol L−1). In summer, the upper estuary showed higher nitrification rates (ammonia oxidation rate ~1.5–33.1 μmol N L−1 d−1, nitrite oxidation rate ~0.6–32.0 μmol N L−1 d−1) with lower concentrations of ammonia (