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于2011年12月~2012年1月现场测定了东海、南黄海表层海水中二甲基硫(DMS)及其前体物质二甲巯基丙酸内盐(DMSP分为溶解态DMSPd和颗粒态DMSPp)的含量,研究了它们的浓度分布规律及其影响因素,并对DMSPp的粒级分布和DMS的海-气通量进行了探讨.结果表明,表层海水中DMS、DMSPd和DMSPp的浓度分别在0.58~4.14、0.37~7.86和4.29~25.76 nmol·L-1之间,平均值分别为(2.20±0.82)、(2.12±1.66)和(11.98±6.23)nmol·L-1.DMS、DMSPp与叶绿素a(Chl-a)呈现明显的正相关关系,并且它们的周日变化趋势基本一致,说明浮游植物生物量是影响研究海域内DMS和DMSP生产分布的关键因素.另外,DMSPd浓度和总细菌丰度表现出一定的负相关,这可能是在细菌释放的DMSP裂解酶的作用下DMSPd会发生裂解生成DMS.研究发现,5~20μm的微型浮游植物是海区内Chl-a和DMSPp的主要贡献者.此外,冬季东海、南黄海表层海水DMS的海-气通量在0.61~25.52μmol·(m2·d)-1之间,平均值为(8.30±5.92)μmol·(m2·d)-1.
From December 2011 to January 2012, dimethyl sulfide (DMS) in seawater of the East China Sea and the South Yellow Sea and its precursor substance, DMSP (DMSP), were separated into dissolved DMSPd and granular DMSPp ), The concentration distribution of DMSPp and its influencing factors were studied, and the particle size distribution of DMSPp and the sea-air flux of DMS were discussed.The results showed that the concentrations of DMS, DMSPd and DMSPp in surface seawater were in the range of (2.20 ± 0.82), (2.12 ± 1.66) and (11.98 ± 6.23) nmol·L-1.DMS, DMSPp with the average value of 2.28 ± 4.14, 0.37 ± 7.86 and 4.29 ~ 25.76 nmol·L- Chlorophyll a (Chl-a) showed a significant positive correlation, and the trend of their daily variation was basically the same, indicating that phytoplankton biomass is the key factor influencing the production distribution of DMS and DMSP in the study area.In addition, the concentration of DMSPd and total bacteria Abundance showed a certain negative correlation, which may be caused by the release of DMSP lyase DMSPd lysate to generate DMS. The study found that 5 ~ 20μm micro-phytoplankton in the sea area is the main contribution of Chl-a and DMSPp In addition, the sea-air fluxes of surface seawater DMS in the East China Sea and South Yellow Sea in winter range from 0.61 to 25.52 mol · (m2 · d) -1, and the average value of (8.30 ± 5.92) μmol · (m2 · d) -1.