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河流入海口被认为对减少输送到海洋里的氮负荷有很重要的作用。我们监测了北波罗的海的6个海湾河口的脱氮速度。其中4个是波的尼亚湾(波的尼亚湾的北部海湾)的河口,两个是河口海湾,一个在群岛海(波的尼亚湾南部海湾),另一个在芬兰湾。4个河口脱氮作用的速度介于330～905μmolN/m~2·d之间。群岛海和波的尼亚湾的河口海湾脱氮作用的速度分别为90～910μmolN/m~2·d,230～320μmol N/m~2·d。脱氮作用能够去除掉河口处和芬兰湾的河口海湾处的总氮负荷量的3.6%～9.0%,在这些地方停留的时间是短暂的。而停留时间很长,在河口海湾群岛海入海之前4.5%的硝酸盐负荷和19%的氮负荷能被去除掉。根据我们的监测结果,快速流动的河流以及河口地区的沉积物停留短暂,去除流向波罗的海的氮负荷的能力有限。
River estuaries are thought to play an important role in reducing the nitrogen load delivered to the sea. We monitored the rate of denitrification in six Gulf estuaries in the North Baltic Sea. Four of these are the mouths of the Gulf of Nia (the northern Gulf of the Gulf of Bothnia), two estuaries, one in the archipelagic sea (the southern Gulf of the Gulf of Innia) and the other in the Gulf of Finland. The speed of denitrification in the four estuaries was between 330 ~ 905μmolN / m ~ 2 · d. The rates of denitrification in the estuaries of the Archipelago Sea and the Gulf of Avenae were respectively 90 ~ 910μmol N / m ~ 2 · d and 230 ~ 320μmol N / m ~ 2 · d. Denitrification removes 3.6% -9.0% of the total nitrogen load at the mouth of the estuary and in the estuaries off the Gulf of Finland, where the stay is brief. The residence time was long and a 4.5% nitrate load and 19% N load were removed before entering estuaries into the Estuary estuary. Based on our monitoring results, sediments in fast moving rivers and estuaries are short lived and have limited capacity to remove nitrogen load to the Baltic Sea.