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首页> 外文期刊>ICES Journal of Marine Science >The role of inorganic and organic nutrients on the development of phytoplankton along a transect from the Daugava River mouth to the Open Baltic, in spring and summer 1999
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The role of inorganic and organic nutrients on the development of phytoplankton along a transect from the Daugava River mouth to the Open Baltic, in spring and summer 1999

机译：1999年春夏季，从道加瓦河河口到波罗的海沿岸样带的无机和有机养分对浮游植物发育的作用

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摘要

The importance of dissolved silicate (DSi), dissolved inorganic nitrogen (DIN), dissolved organic nitrogen (DON), phosphate and dissolved organic phosphorus (DOP) on algal growth is analysed for the Gulf of Riga and the adjacent open Baltic Sea. The results of three cruises (May, June, and July, 1999) along a transect across the Gulf of Riga from the entrance to the Daugava River to the open Baltic are presented. Nutrient-limitation was identified on the basis of available nutrient concentrations and stoichiometric analysis. In spring, phosphate appeared to be the algal-growth-potential-limiting nutrient at the entrance of the Daugava River, DSi in the central Gulf, and DIN at the open Baltic station. There was no correlation between limiting nutrient and spring phytoplankton community structure. Both the DIN and phosphate pools of the upper mixed layer were exhausted by mid-May, except at the river mouth. In summer there was a good correlation between phytoplankton biomass and DOP along the transect. Contrary to the situation in the open Baltic, the lower layer DIN/phosphate ratio in the Gulf of Riga significantly exceeds the Redfield ratio, and upwelling likely does not favour nitrogen-fixing species. Therefore, the upper layer DOP pool should be regarded as potentially the main source of phosphorus for nitrogen-fixing cyanobacteria in the Gulf of Riga.
机译：分析了里加湾和邻近的波罗的海的溶解硅酸盐（DSi），溶解无机氮（DIN），溶解有机氮（DON），磷酸盐和溶解有机磷（DOP）对藻类生长的重要性。展示了从道加瓦河河的入口到波罗的海沿岸跨过里加湾的一个横断面的三个巡航（1999年5月，6月和7月）的结果。根据可利用的营养物浓度和化学计量分析确定了营养限制。在春季，磷酸盐似乎是道加瓦河河口，中部海湾地区的DSi和开放的波罗的海站中的DIN的藻类生长潜力限制营养素。限制营养与春季浮游植物群落结构之间没有相关性。 5月中旬，除了河口以外，上层混合层的DIN和磷酸盐池都已耗尽。夏季，该样带浮游植物生物量与DOP之间存在良好的相关性。与开放波罗的海地区的情况相反，里加湾的下层DIN /磷酸盐比率大大超过了Redfield比率，并且上升流可能不利于固氮菌种。因此，上层DOP池应被视为潜在的里加湾固氮蓝细菌的主要磷源。

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