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中文摘要：
根据2002—2004年11月对长江口及其邻近海域的调查结果，比较了三峡工程蓄水前后该海域溶解态营养盐结构以及浮游植物生长潜在的营养盐限制状况，初步分析了导致蓄水前后营养盐结构及限制状况变化的可能原因．结果表明。蓄水后口门内N：P和Si：P呈上升的趋势，N：P增加了40％以上，Si：P上升了6％，而Si：N降低了26％．蓄水后口门外营养盐结构的变化趋势与口门内相似，但N：P升高更为显著，与蓄水前相比增加了2倍以上，但Si：N降低了20％．该水域浮游植物生长潜在的磷限制在三峡蓄水后增强．具有磷限制特征的样品比例从蓄水前的28．6％增加到蓄水后的70％以上，表明该海域潜在的磷限制区域有扩大的趋势．尽管蓄水后Si：N降低显著，但未导致该水域出现潜在的硅限制．
英文摘要：
Three cruises in November 2002 - 2004 were undertaken in Yangtze River Estuary and its adjacent area. Dissolved nutrient structures and limitation for phytoplankton growth before and after water storage of the Three Gorges Project were compared. The possible reasons that resulted in the change of nutrient structures and limitation were analyzed. The results indicate that dissolved nutrient structures change much after water storage. N ： P and Si ： P at inner gate increase by 40 % and 6 %, respectively ; while Si ： N decreases by 26 %. Similar with inner gate, N ： P and Si ： P increase but Si： N decreases remarkably at outer gate after water storage. N ： P increases 2 fold whereas Si： N declines by 20% at outer gate after water storage. Potential P limitation in Yangtze River Estuary is more serious. The percentage of potential P limitation in samples increases from 28.6% before water storage to more than 70% after water storage, indicating that there is an augmenting trend of area with characteristics of potential P limitation after water storage. Though Si： N decreased remarkably, potential Si limitation does not occur after water storage.
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