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 indifferent seasons and the correlation of reservoir water environmental factors were analyzed, and the morphological changes of inorga nicnitrogen 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 hig her in the inlet water than in the outlet water, and the dissolved oxygen content was highest in the middle position. In summer, ORP w as lower than in autumn, while stronger the oxidization and the nitrification, and lower the ammonia nitrogen mass concentration. The T DS 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 decr eased 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 concentr ation was higher at the outlet compared to the inlet. Ammonia nitrogen and nitrate nitrogen mass concentration were spring> summer> autumn, respectively. Dissolved inorganic nit rogen( DIN) was mainly nitrate nit rogen, acco unting for 81.97% on aver age.
国家自然科学基金( 40872156) ; 天津市自然科学基金重点项目( 11JCZDJC24700)