摘要
为了探究可转化态氮(transformable total nitrogen,TTN)的影响因素及其释放潜力,本文采用分级浸取的方法将渤海表层沉积物中的氮分为离子交换态氮(ion exchange nitrogen,IEF-N)、弱酸可浸取态氮(weak acid extractable nitrogen,WAEF-N)、强碱可浸取态氮(strong alkali extractable nitrogen,SAEF-N)、强氧化剂可浸取态氮(strong oxidizer extractable nitrogen,SOEF-N)和非转化态氮(non-transformable nitrogen,NTN),研究了沉积物粒径和有机质等对释放氮量的影响,探讨了沉积物中TTN的释放对上覆水中溶解无机氮(dissolved inorganic nitrogen,DIN)和叶绿素a(Chl a)的影响。结果表明,各TTN的含量顺序为SOEF-N>SAEF-N>IEF-N>WAEF-N,释放量为IEF-N>SAEF-N>SOEF-N>WAEF-N,释放比例为IEF-N>WAEF-N>SAEF-N>SOEF-N,分别有69.83%的IEF-N、64.93%的WAEF-N、56.27%的SAEF-N、29.56%的SOEF-N将再次释放。Pearson相关性分析结果显示,沉积物中SOEF-N的释放量与粉砂含量呈负相关,而与砂含量呈正相关;SOEF-N的释放量与上覆水中的Chl a和溶解无机氮(dissolved inorganic nitrogen,DIN)均呈负相关,说明SOEF-N的释放对上覆水中Chl a和DIN的影响较小,而表层和底层水的Chl a和DIN分别具有极强的正相关关系(r=0.803,P<0.01;r=0.831,P<0.01),这可能意味着研究区域内的水柱没有出现明显的分层。
To investigate the influencing factors of transformable total nitrogen(TTN)and its release potential,this paper used a graded leaching method to classify nitrogen in the Bohai Sea surface sediments into ion exchange nitrogen(IEF-N),weak acid extractable nitrogen(WAEF-N),strong alkali extractable nitrogen(SAEF-N),strong oxidizer extractable nitrogen(SOEF-N)and non-transformable nitrogen(NTN)states,the effects of sediment particle size and organic matter on the amount of released nitrogen were also investigated,and the effects of TTN release in sediment on dissolved inorganic nitrogen(DIN)and Chl a in the overlying water were examined.The results showed that the order of the content of each TTN was SOEF-N>SAEF-N>IEF-N>WAEF-N,the release amount was IEF-N>SAEF-N>SOEF-N>WAEF-N,and the release ratio was IEF-N>WAEF-N>SAEF-N>SOEF-N,respectively,69.83%of IEF-N,64.93%of WAEF-N,56.27%of SAEF-N,and 29.56%of SOEF-N will be released again.Pearson correlation results showed that the release of SOEF-N in the sediment was negatively correlated with silt content,but is positively correlated with sand content;SOEF-N was negatively correlated with both Chl a and dissolved inorganic nitrogen(DIN)in the overlying water,indicating that the release of SOEF-N has less effect on the Chl a and DIN in the overlying water,while waters of surface and bottom had extremely strong positive correlations(r=0.803,P<0.01;r=0.831,P<0.01),respectively,which may imply that there is no significant stratification of surface and bottom waters in this study area.
作者
李震
李云凯
刘永虎
程前
张硕
LI Zhen;LI Yunkai;LIU Yonghu;CHENG Qian;ZHANG Shuo(College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China;Key Laboratory of the Ministry of Education for the Sustainable Development of Ocean Fishery Resources,Shanghai OceanUniversity,Shanghai 201306,China;Dalian Modern Marine Ranch Research Institute,Dalian 116023,China;Joint Laboratory for Monitoring and Protection of Aquatic Organisms in the Yangtze River Estuary,Shanghai 201306,China)
出处
《热带海洋学报》
CAS
CSCD
北大核心
2022年第4期163-171,共9页
Journal of Tropical Oceanography
基金
上海市人才发展资金资助项目(B1-5404-19-0002)
上海市科委地方能力建设项目(21010502200)。
关键词
沉积物
上覆水
可转化氮
理化性质
生态意义
sediment
overlying water
transformable nitrogen
physicochemical properties
ecological significance
