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中文摘要：
根据2004年4个航次的调查资料，研究了长江河口内及其临近海域磷酸盐和总磷的分布变化特征。结果表明。磷酸盐和总磷的浓度分布都是河口附近高，外海低，但其最大值不在河口内，而在口门外。河口内磷酸盐秋、冬季浓度高，春、夏季低；总磷夏、秋季浓度高，春季和冬季低。口门外磷酸盐和总磷浓度分布都是冬、夏季高，春、秋季低。磷酸盐夏季浓度变化大，分层明显，冬季变化小，垂直分布均匀。总磷春季表、底层浓度接近，其余季节表层都低于底层。通过磷酸盐和总磷与盐度、悬浮体的相关关系研究表明，磷酸盐在河口转移过程中，还受到生物活动、水体垂直对流以及缓冲作用等多种因素的影响。总磷在很大程度上受颗粒磷的控制。
英文摘要：
Based on the data obtained from quarterly investigations in the Changjiang mouth and its adjacent sea areas in 2004, the distributions and variations of PO4-P and TP were discussed. The results showed that both the concentrations of PO4-P and TP were higher near the Changjiang mouth and lower outside the sea, and the highest concentration was not inside the Changjiang mouth but out of the mouth. The PO4-P concentrations inside the mouth in autumn and winter were higher than those in spring and summer, and the TP concentrations in summer and autumn were higher than those in spring and winter. The concentrations of PO4-P and TP outside the mouth were higher in winter and summer than those in spring and autumn. The great changes and obvious stratification in PO4-P concentrations were found in summer, and a few changes and almost even vertical distributions were found in winter. Except spring, TP concentrations were lower in the surface than in the bottom. The correlations between PO4-P, TP, S and TSM show that PO4-P concentration was affected by phytoplankton, vertical convection of seawater and buffer action, etc. in removal process from the river to the estuary. TP concentration was mainly controlled by TSM.
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