Li Xin, Song Lin-Xu, Ji Dao-Bin, Liu De-Fu, Su Qing-Qing, Lü Lin-Peng, Wang Xiong, Huang Ya-Nan, Wu Qing
College of Hydraulic and Environmental Engineering, Three Gorges University, Yichang 443002, China.
Hubei Key Laboratory of Ecological Restoration of River-lakes and Algal Utilization, School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China.
Huan Jing Ke Xue. 2018 Mar 8;39(3):1113-1121. doi: 10.13227/j.hjkx.201707139.
Overlying water and sediment interstitial water samples were acquired to study the nitrogen release between sediments and water interfaces in Xiangxi Bay in April 2016 during the Sensitive Period in spring. The spatial distribution of different forms of nitrogen in the sediment was analyzed, the diffusion fluxes of different forms of nitrogen in the sediments and water systems were also measured, and a correlation analysis with environmental factors was conducted. The results show that overlying water and sediment interstitial water (TN) ranges from 1.10 to 6.90 mg·L and 6.19 to 32.57 mg·L respectively; indicating the nitrogen concentrations in the overlying and interstitial water of sediments have a certain variation along the process and vertically. The interstitial water nitrogen concentrations in the upstream area are higher than those in the downstream area. The interstitial water (NH-N) in the sediment is significantly larger than that in the overlying water, but the interstitial water (NO-N) in the sediment is slightly smaller than that in the overlying water. Xiangxi Bay sediment acts as a source of NH-N; however, for NO-N it is a sink. The diffusive fluxes of NH-N range from 2.70 to 4.72 mg·(m·d); and the diffusive fluxes of NO-N range from -1.61 to -0.62 mg·(m·d). Nitrogen is mainly present in the form of ammonium nitrogen in the sediment of Xiangxi Bay. The (NH-N) in the sediment ranges from 69.97-1185.97 mg·kg, (NO-N) ranges from 2.78-38.17 mg·kg, and the (NH-N) in sediments in the surface at 0-8 cm changes with the same trend.
2016年4月春季敏感期，采集了湘西湾上覆水和沉积物间隙水样本，以研究沉积物与水界面之间的氮释放情况。分析了沉积物中不同形态氮的空间分布，测量了沉积物和水系统中不同形态氮的扩散通量，并与环境因素进行了相关性分析。结果表明，上覆水和沉积物间隙水的总氮（TN）含量分别为1.10至6.90mg·L和6.19至32.57mg·L；表明沉积物上覆水和间隙水中的氮浓度在过程中和垂直方向上都有一定变化。上游区域间隙水氮浓度高于下游区域。沉积物中的间隙水铵态氮（NH₄-N）显著大于上覆水中的，但沉积物中的间隙水硝态氮（NO₃-N）略小于上覆水中的。湘西湾沉积物是铵态氮的源；然而，对于硝态氮它是汇。铵态氮的扩散通量为2.70至4.72mg·(m²·d)；硝态氮的扩散通量为-1.61至-0.62mg·(m²·d)。湘西湾沉积物中的氮主要以铵态氮形式存在。沉积物中的铵态氮含量为69.97 - 1185.97mg·kg，硝态氮含量为2.78 - 38.17mg·kg，0 - 8cm表层沉积物中的铵态氮含量变化趋势相同。
