大辽河口N、P营养盐的分布特征及其影响因素

利用2003年9月在大辽河口水域进行水质调查获取的资料,分析了大辽河口N、P营养盐的分布和时间变化特征.结果表明,从感潮河段、口门至口外的海域,N、P营养盐的含量都呈逐渐降低的趋势.N营养盐保守性较好,其分布主要受海水和河水的混合产生的物理稀释的影响;相比之下,PO4-P由于其缓冲特征,保守性较差.根据调查区水体富营养化的评价结果,在辽河口口门附近海域和靠近辽东湾东岸的海域,水体呈富营养化和中等营养水平,在远离海岸的海域,水体呈贫营养状态.

Distributions and the factors influenced of nitrogen and phosphorus nutrients in the Daliaohe Estuary

Based on the data obtained in the water quality survey in the Daliaohe Estuary in September,2003,the distribution and diurnal variations of nitrogen and phosphorus nutrients were analyzed in this paper.The results showed that the concentrations of nitrogen and phosphorus nutrients were decreased in the direction from tidal reach,mouth to coastal areas.Nitrogen shown the good conservative characteristics,and their distributions were mainly controlled by the physical dilution in the processes of sea-fresh water mixture.Phosphorus,however,were not so conservative compared with nitrogen nutrients,due to their buffer attributes.According to the eutrophication assessment in the survey area,in areas closed to the river entrance and east coast of the Liaodong Bay,seawater showed the eutrophication or moderate eutrophication status,areas far from the coast and entrance were under the dystrophic status.