| 冬季东海、南黄海中DMS和DMSP浓度分布及影响因素研究 |
| 摘要点击 2601 全文点击 1512 投稿时间：2013-09-24 修订日期：2013-11-20 |
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| 中文关键词 二甲基硫 二甲巯基丙酸内盐 浓度分布 海-气通量 东海 南黄海 |
| 英文关键词 dimethylsulfide dimethylsulfoniopropionate concentration distribution sea-to-air flux East China Sea Southern Yellow Sea |
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| 中文摘要 |
| 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，5~20 μm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0.61~25.52 μmol·（m2·d）-1之间，平均值为（8.30±5.92） μmol·（m2·d）-1. |
| 英文摘要 |
| The concentrations of dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) were measured in situ in the East China Sea and the Southern Yellow Sea during December 2011 and January 2012 to study their horizontal distributions and influencing factors. Besides, the size distribution of DMSPp and the sea-to-air flux of DMS were also investigated. The concentrations of DMS, dissolved DMSP (DMSPd) and particulate DMSP (DMSPp) ranged from 0.58 to 4.14, from 0.37 to 7.86 and from 4.29 to 25.76 nmol·L-1, respectively, with the average values of (2.20±0.82), (2.12±1.66) and (11.98±6.23) nmol·L-1. In addition, significantly positive correlations were found between DMS, DMSPp and chlorophyll a, and their diel variations followed the same trend, implying that phytoplankton biomass might play an important role in controlling the production and distributions of DMS and DMSP. A negative correlation was found between DMSPd and total bacterial abundance, probably because DMSPd was transferred into DMS under the action of DMSP lyase released from bacteria. Moreover, the larger nanophytoplankton (5-20 μm) contributed to the vast majority of Chl-a and DMSPp in the study area. The sea-to-air fluxes of DMS during the investigation were estimated to be from 0.61 to 25.52 μmol·(m2·d)-1, with an average of (8.30±5.92) μmol·(m2·d)-1. |
