天津某水库无机氮分布规律

Distribution of inorganic nitrogen in a reservoir in Tianjin

以天津某水库为研究对象,分析水库不同季节无机氮的分布规律和库水环境因子的相关性,探讨无机氮的形态变化。研究结果表明:库中位置的温度低于进水和出水。溶解氧质量浓度进水高于出水方向,中间位置的溶解氧质量浓度最高。夏季ORP低于秋季,氧化性越强则硝化反应越强,氨氮质量浓度低于夏季。TDS随深度增加而降低,出水方向离海岸更近,水体的TDS更高。秋季pH高于夏季。NH3-N西岸高于东岸,进水方向质量浓度高于出水方向。NO2-N多数站点随深度增加质量浓度减小,盐度与NO2-N呈现出显著正相关性。氨氮和硝态氮质量浓度占比都是春季>夏季>秋季。溶解态无机氮(DIN)以硝态氮为主,平均占比81.97%。

Taking a reservoir in Tianjin as the research object,the distribution law of inorganic nitrogen in different seasons and the correlation of reservoir water environmental factors were analyzed,and the morphological changes of inorganic nitrogen were discussed.The results show that the temperature of the reservoir was lower than that of the inlet and outlet.The dissolved oxygen mass concentration was higher in the inlet water than in the outlet water,and the dissolved oxygen content was highest in the middle position.In summer,ORP was lower than in autumn,while stronger the oxidization and the nitrification,and lower the ammonia nitrogen mass concentration.The TDS decreased with the increase of depth,the water outlet was closer to the coast,and the TDS of water was higher.The pH was higher in autumn than in summer.The west bank of NH3-N was higher than the east bank,and the mass concentration in the inlet direction was higher than that in the outlet direction.The mass concentration of NO2-N decreased with the increase of depth at most of the sites,and the salinity showed a significant positive correlation with NO2-N.The main form of inorganic nitrogen as nitrate-nitrogen,whose mass concentration was higher at the outlet compared to the inlet.Ammonia nitrogen and nitrate-nitrogen mass concentration were spring>summer>autumn,respectively.Dissolved inorganic nitrogen(DIN)was mainly nitrate nitrogen,accounting for 81.97%on average.