摘要
利用催化动力学分光光度法和两步提取法对2011年4月(春)、8月(夏)、10月(秋)和2012年1月(冬)桑沟湾海域溶解态无机锰(DIMn)和表层沉积物中的锰的含量进行测定。结果表明,桑沟湾4个季节(春季至冬季,后同)DIMn浓度呈现出近岸高、远岸低的分布特点,其平均浓度分别为(60.5±43.1)nmol/L、(42.0±30.5)nmol/L、(23.4±11.2)nmol/L和(18.2±13.5)nmol/L,呈现出明显的季节变化,即春季最高,夏季、秋季次之,冬季最低;与相邻的俚岛湾和爱莲湾相比,桑沟湾春季、夏季DIMn的浓度较高,秋季、冬季则没有显著性差异。桑沟湾表层沉积物中总Mn在4个季节的含量分别为(861±308)mg/kg、(915±322)mg/kg、(589±108)mg/kg、(653±185)mg/kg,表层沉积物中醋酸提取态Mn在4个季节的含量分别为(500±272)mg/kg、(502±232)mg/kg、(322±81)mg/kg、(345±91)mg/kg,两者均表现出近岸高、远岸低的分布特点。醋酸提取态Mn的含量在春季、夏季要显著高于秋季、冬季。悬浮颗粒物的吸附和浮游生物的利用是影响桑沟湾DIMn浓度与分布的重要因素。桑沟湾DIMn的源主要包括河流及地下水输送、大气输送、沉积物−水界面释放;汇主要包括养殖生物的清除、向黄海的输送等。简单箱式模型收支计算结果显示,桑沟湾DIMn的源略大于汇,表明除了养殖生物的清除和向黄海的输送,桑沟湾DIMn还存在其他汇。本研究的结果为桑沟湾DIMn的生物地球化学循环的深入认识提供了基础数据。
The distribution of dissolved manganese(DIMn)and manganese in surface sediment in the Sanggou Bay were investigated in April,August,October 2011 and January 2012.The concentrations of DIMn and manganese in surface sediment were measured by the the catalytic-kinetic spectrophotometric and two-step extraction method,respectively.The results showed that the average concentration of DIMn in 2011−2012 were(60.5±43.1)nmol/L in April,(42.0±30.5)nmol/L in August,(23.4±11.2)nmol/L in October and(18.2±13.5)nmol/L in January.The high concentrations of DIMn always being found in the estuary and decreased from nearshore to the coastal area.There exists significant seasonal variation for concentrations of DIMn with highest value in spring,followed by summer and autumn,and lowest value in winter.The concentrations of DIMn in the Sanggou Bay were higher than the Ailian Bay and the Lidao Bay in spring and summer,and with insignificant variation in autumn and winter.The average content of total manganese(TMns)in surface sediment were(861±308)mg/kg in April 2011,(915±322)mg/kg in August 2011,(589±108)mg/kg in October 2011 and(653±185)mg/kg in January 2012.The average content of acetic acid-soluble manganese(HAc-Mn)in surface sediment were(500±272)mg/kg in April 2011,(502±232)mg/kg in August 2011,(322±81)mg/kg in October 2011,(345±91)mg/kg in January 2012.The content of TMns and HAc-Mn in the sediment of the bay were both decreased with the increasing distance from the coast.There exists significant seasonal variation for concentrations of HAc-Mn in the surface sediments during the investigations,with higher concentrations occurred in spring and summer than that in autumn and winter.The adsorption of SPM and utilization of plankton were important factors affecting the content and distribution of DIMn in the Sanggou Bay.The major sources for DIMn in the Sanggou Bay included the inputs from riverine,groundwater discharge,atmospheric deposition and release from the sediment-water interface.The major sinks for DIMn include
作者
刘家琦
任景玲
陈晶
房瑞雪
蒋增杰
Liu Jiaqi;Ren Jingling;Chen Jing;Fang Ruixue;Jiang Zengjie(Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China;Yellow Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Qingdao 266071,China)
出处
《海洋学报》
CAS
CSCD
北大核心
2021年第2期16-27,共12页
基金
国家自然科学基金(41676072)
山东省“泰山学者”工程专项经费
青岛海洋科学与技术国家实验室“鳌山人才”计划项目(2015ASTP-OS08)。
关键词
溶解态锰
沉积物
分布
季节变化
影响因素
收支
桑沟湾
dissolved manganese
sediment
distribution
seasonal variation
influence factors
flux and budget
Sanggou Bay
