泉州湾溶解无机氮的含量分布组成及其与环境因子的关系

发布时间：2018-10-05 10:45

【摘要】：分析了泉州湾溶解无机氮(DIN)春季的含量分布、组成、潮周期及其与环境因子的关系.根据高值区判断洛阳江口以县区农田养殖输入硝酸氮(NO_3~--N)为主,而晋江口以市区生活污水输入氨氮(NH_4~+-N)为主,DIN含量的平面分布受NO_3~--N与NH_4~+-N共同控制.DIN的平均组成为NO_3~--N最高,NH_4~+-N其次,NO_2~--N远低于二者,NH_4~+-N平均占比达35%左右,DIN的组成未达到热力学平衡.根据DIN含量与溶解氧(DO)及化学需氧量(COD)的相关性分析,推测三氮转换不仅受到氧化还原过程的影响,还受更为复杂的来源、人类活动及生物过程等的影响;根据DIN含量与盐度的关系,NO_3~--N及NO2--N均呈现保守行为,NH_4~+-N淡水端有一定的增加现象,DIN含量与盐度的关系受NO_3~--N和NH_4~+-N共同控制;DIN含量还受到悬浮物含量、温度、盐度及p H值等环境因子的控制,结合DIN含量与叶绿素a的相关性及分布情况,可推测春季DIN主要来源不是浮游植物分解.不同站位DIN含量的潮期变化相似,基本上都表现为涨潮冲淡作用下含量降低而落潮后回升.除此之外,泉州湾DIN含量的年际增长及超标均比较严重,需要采取相应的治理措施.
[Abstract]:The content distribution, composition, tidal period and relationship between dissolved inorganic nitrogen (DIN) and environmental factors in Quanzhou Bay in spring were analyzed. According to the high value area, the main input of nitrate nitrogen (NO_3~--N) in the county area is the river mouth of Luoyang. In Jinjiang Estuary, the plane distribution of the input ammonia nitrogen (NH_4~ N) content in urban sewage is controlled by NO_3~--N and NH_4~ N. The average composition of din is the highest in NO_3~--N. The next step is that no 2 + -N is far lower than the average composition of Prida 35% in total NH 4 ~ -N in Jinjiang Estuary. The thermodynamic equilibrium is not reached. Based on the correlation analysis of DIN content with dissolved oxygen (DO) and chemical oxygen demand (COD), it is inferred that the trinitrogen conversion is affected not only by the redox process, but also by more complex sources, human activities and biological processes. According to the relationship between DIN content and salinity, both N and NO2--N showed a conservative behavior. There was a certain increase in the content of din and salinity at the fresh water end of NH4- N. The relationship between din content and salinity was controlled by NO_3~--N and NH_4~ -N, and the content of tin was also controlled by the content of suspended solids and the temperature. Under the control of environmental factors, such as salinity and pH value, combined with the correlation and distribution of DIN content and chlorophyll a, it can be inferred that the main source of DIN in spring is not phytoplankton decomposition. The changes of DIN content in different stations were similar in tidal period, and they all showed that the content decreased under the action of high tide dilution, but rose after falling tide. In addition, the interannual growth and excess of DIN content in Quanzhou Bay are serious, so it is necessary to take corresponding measures.
【作者单位】：厦门大学海洋与地球学院;福州市海洋与渔业技术中心;
【基金】：国家自然科学基金资助项目(41376050)
【分类号】：P734

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