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闽江入海断面溶解无机氮长时间序列分析及入海通量估算
Long Time Series Analysis and Fluxes Estimation of Dissolved Inorganic Nitrogen in Section of River-Sea Boundary in Minjiang Estuary
投稿时间:2022-05-27  修订日期:2022-10-27
DOI:10.19316/j.issn.1002-6002.2023.06.11
中文关键词:  闽江  溶解无机氮  季节性肯达尔检验  局部加权回归散点平滑法  通量
英文关键词:Minjiang River  dissolved inorganic nitrogen (DIN)  seasonal Kendall test (SK test)  locally weighted scatterplot smoothing (LOWESS)  flux
基金项目:国家自然科学基金资助项目(41961144022);福建省环保科技计划资助项目(2021R010,2021R011);自然资源部第三海洋研究所基本科研业务费专项资金资助项目(海三科202008)
作者单位
王颢 福建省环境监测中心站, 福建 福州 350003 
陈克亮* 自然资源部第三海洋研究所, 福建 厦门 361005
厦门海洋职业技术学院, 福建 厦门 361100
自然资源部海洋生态保护与修复重点实验室, 福建 厦门 361005 
吴烨飞 福建省环境监测中心站, 福建 福州 350003 
陈文花 福建省环境监测中心站, 福建 福州 350003 
林云杉 福建省环境监测中心站, 福建 福州 350003 
白亮 福建省环境监测中心站, 福建 福州 350003 
任保卫 福建省渔业资源监测中心, 福建 福州 350003 
通讯作者:陈克亮*  自然资源部第三海洋研究所, 福建 厦门 361005;厦门海洋职业技术学院, 福建 厦门 361100;自然资源部海洋生态保护与修复重点实验室, 福建 厦门 361005  
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中文摘要:
      为深入研究闽江口富营养化机制,于1985—2021年在闽江入海断面开展了水质监测。采用结合局部加权回归散点平滑法(LOWESS)的季节性肯达尔检验(SK检验)对断面溶解无机氮(DIN)及其各组分浓度变化趋势进行分析,同时结合水文资料对入海通量进行估算。结果表明:DIN浓度范围为0.728~3.140 mg/L,在37年间整体呈上升趋势,但不显著。各组分中NO2-N和NH3-N浓度分别呈显著和极显著下降趋势,而NO3-N浓度呈极显著上升趋势。DIN组分中NO2-N和NH3-N比重不断减小,而NO3-N比重不断增大,目前已成为DIN的主要组成部分。DIN入海通量范围为3.59×104~14.85×104 t,在37年间缓慢增加,其各组分入海通量长期变化趋势同浓度变化类似。从长期来看,DIN及其各组分浓度的变化趋势主要受流域环境变化及下游福州市含氮废水排放影响,而在短期则受台风、降水等一些突发环境事件的影响较大。
英文摘要:
      In order to understand the mechanics of eutrophication in Minjiang estuary,water quality monitoring was carried out in section of river-sea boundary in Minjiang estuary from 1985 to 2021.Using seasonal Kendall test combined with LOWESS,the concentration variation trends of dissolved inorganic nitrogen (DIN) and its components were analyzed.Fluxes were also estimated with hydrological data.Results showed that the concentration of DIN range from 0.728 to 3.140 mg/L,with an overall upward trend but not significant during the 37 years.The concentrations of NO2-N and NH3-N revealed significant and highly significant downward trends relatively,while the concentration of NO3-N revealed highly significant upward trend.For DIN components,the percentage of both NO2-N and NH3-N fell continuously while the percentage of NO3-N raised,thus NO3-N became dominant part of DIN in recent years.The flux of DIN into the sea ranged from 3.59×104 to 14.85×104 t,and raised slowly during the 37 years,and the long-term flux trends of its components were similar to that of the concentration.Variations of DIN and its components were mainly affected by environment changes in Minjiang River basin and nitrogenous wastewater discharged from Fuzhou City on a long-term basis,however it could be greatly affected by some environmental event (typhoon) on a short-term basis.
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