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根据2009年2、5,8和11月对大沽河口潮滩水体N、P营养盐浓度、盐度、溶解氧含量和大型底栖动物的调查,研究了大沽河口潮滩N、P的时空分布特征。结果表明,DIN在冬、春,秋季以NO3-N为主,其次为NO2-N和NH4-N。在夏季,NO3-N、NO2-N和NH4-N在DIN中所占比重相当。N/P比值在夏季接近Redfield比值,在其它季节偏高。NO3-N浓度在冬季较高、夏季偏低;NO2-N浓度的季节变化不明显;NH4-N浓度在夏季较高、冬季偏低;PO4-P浓度在夏季较高、秋季偏低。NO3-N、NO2-N和PO4-P浓度主要自河道向东西潮滩递减,从近岸向湾内递减;NH4-N浓度无显著平面分布趋势,但在夏、秋季的西潮滩较高。NO3-N、NO2-N和PO4-P的分布主要受大沽河淡水注入的影响,同时在夏季受到浮游植物的吸收作用的显著影响,而NH4-N的分布则可能主要受到潮滩贝类等底栖动物NH4-N排泄作用的影响。潮滩在冬、春季为P中等限制潜在性富营养,在夏季为中等营养,在秋季为P限制潜在性富营养。
According to the investigation of N, P nutrient concentration, salinity, dissolved oxygen content and macrobenthos in tidal flat and tidal flat of Dagu estuary in February, February, August, August and November in 2009, Spatial and temporal distribution characteristics. The results showed that DIN was mainly NO3-N in winter, spring and autumn, followed by NO2-N and NH4-N. In the summer, NO3-N, NO2-N and NH4-N share in the proportion of DIN. The N / P ratio approaches the Redfield ratio in summer and is high in other seasons. The concentration of NO3-N was higher in winter and lower in summer, while the seasonal variation of NO2-N was not obvious. The concentration of NH4-N was higher in summer and lower in winter. The concentration of PO4-P was higher in summer and lower in autumn. The concentration of NO3-N, NO2-N and PO4-P decreased from the river to the east-west tidal flat, and decreased from the nearshore to the bay. The concentration of NH4-N showed no obvious planar distribution but higher in the summer and autumn. The distribution of NO3-N, NO2-N and PO4-P is mainly affected by freshwater injection from Dagu River and significantly affected by phytoplankton uptake in summer, while the distribution of NH4-N may be mainly affected by tidal flat shellfish Effects of NH4-N excretion in benthic fauna. Tidal flat in the winter and spring for the P medium to limit the potential of eutrophication, in the summer for the medium nutrition, P in the fall to limit the potential for eutrophication.