孙鑫, 任景玲, 刘家琦, 房瑞雪, 蒋增杰. 桑沟湾不同形态锰的分布、季节变化及影响因素[J]. 海洋环境科学, 2023, 42(4): 511-522, 533. DOI: 10.12111/j.mes.2022-x-0194
引用本文: 孙鑫, 任景玲, 刘家琦, 房瑞雪, 蒋增杰. 桑沟湾不同形态锰的分布、季节变化及影响因素[J]. 海洋环境科学, 2023, 42(4): 511-522, 533. DOI: 10.12111/j.mes.2022-x-0194
SUN Xin, REN Jingling, LIU Jiaqi, FANG Ruixue, JIANG Zengjie. Distributions, seasonal variations and influence factors of different manganese species in the Sanggou bay[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2023, 42(4): 511-522, 533. DOI: 10.12111/j.mes.2022-x-0194
Citation: SUN Xin, REN Jingling, LIU Jiaqi, FANG Ruixue, JIANG Zengjie. Distributions, seasonal variations and influence factors of different manganese species in the Sanggou bay[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2023, 42(4): 511-522, 533. DOI: 10.12111/j.mes.2022-x-0194

桑沟湾不同形态锰的分布、季节变化及影响因素

Distributions, seasonal variations and influence factors of different manganese species in the Sanggou bay

  • 摘要: 本研究利用催化动力学分光光度法和紫外消解法对2013年4月、7月、10月和2014年1月桑沟湾养殖海域溶解态无机锰(DIMn)及溶解态有机锰(DOMn)的浓度进行测定,利用两步提取法,对2013年4月、10月和2014年1月表层沉积物中可提取态锰(HAc-Mn)和总锰(TMns)的含量进行测定。桑沟湾4个季节 DIMn浓度的平均值分别为(62.0±43.4) nmol/L、(53.2±50.4) nmol/L、(20.5±7.4) nmol/L 和(15.4±8.7) nmol/L,DOMn浓度的平均值分别为(10.8±5.1) nmol/L、(14.5±18.3) nmol/L、(2.8±2.4) nmol/L 和(7.5±3.7) nmol/L,DIMn和DOMn浓度均呈现春、夏季高于秋、冬季的季节变化特征以及自近岸到外海逐渐降低的空间分布趋势。春季、秋季和冬季,桑沟湾表层沉积物中TMns的含量分别为(882±218) mg/kg、(617±117) mg/kg、(625±64) mg/kg,HAc-Mn的含量分别为(508±151) mg/kg、(335±83) mg/kg、(289±39) mg/kg,二者均表现出近岸高、远岸低的空间分布以及春季高于秋、冬季的季节变化特征。悬浮颗粒物的吸附和浮游生物的利用是影响桑沟湾溶解态锰(TDMn)分布及季节变化的重要因素。影响桑沟湾海域TDMn分布的主要因素包括河流及地下水的输入、沉积物—水界面的释放、大气沉降、桑沟湾向黄海的输出及养殖生物的吸收利用。桑沟湾TDMn通量的箱式模型计算结果表明源小于汇,说明桑沟湾TDMn还存在其他源。TDMn在桑沟湾的存留时间为(44.9±41.1) d,显著低于大洋,可能与特殊的水文环境及养殖生物的吸收利用有关。

     

    Abstract: The concentrations of dissolved inorganic manganese (DIMn), dissolved organic manganese (DOMn) in Sanggou bay were determined by the catalytic-kinetic spectrophotometry and UV digestion in April, July, October 2013 and January 2014.The contents of extractable manganese (HAc-Mn) and total manganese (TMns) in surface sediments were determined by two-step extraction in April, October 2013 and January 2014. The results showed that the average concentrations of DIMn in 2013−2014 were (62.0±43.4) nmol/L in April, (53.2±50.4) nmol/L in July, (20.5±7.4) nmol/L in October and (15.4±8.7) nmol/L in January and the average concentration of DOMn in 2013−2014 were (10.8±5.1) nmol/L, (14.5±18.3) nmol/L, (2.8±2.4) nmol/L and (7.5±3.7) nmol/L, respectively. The concentrations of DIMn and DOMn were higher in spring and summer than in autumn and winter, and gradually decreased from coastal to offshore. The average contents of TMns in surface sediment were (882±218) mg/kg in April 2013, (617±117) mg/kg in October 2013 and (625±64) mg/kg in January 2014 and the average contents of HAc-Mn were (508±151) mg/kg in April 2013, (335±83) mg/kg in October 2013 and (289±39) mg/kg in January 2014 respectively. The contents of TMns and HAc-Mn in the sediment were both decreased with the increasing distance from the coast, and the contents in spring and were higher than those in autumn and winter. The adsorption/desorption behavior on the suspended particulate matter and the utilization of plankton are important factors affecting the distribution and seasonal variation of dissolved manganese in the Sanggou Bay. The influcing factors of TDMn included the riverine and groundwater discharge, release from sediment-water interface and atmospheric deposition, the water exchange with the Yellow Sea and the absorption or accumulation by biological activities. Box model calculation results indicate that the total fluxes of different sources of TDMn in Sanggou bay are 41.9% lower than the sinks, indicating that there might exist other sources of TDMn in the Sanggou bay. The residence time of TDMn in the Sanggou bay is (44.9±41.1)d, which is significantly shorter than that in the ocean, and may be related to the special hydrological environment and the absorption and utilization of cultured organisms.

     

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