胶州湾海水中DMS和DMSP的分布及其影响因素

Distributions of DMS and DMSP in the Jiaozhou Bay and the Influencing Factors

为了解人为活动对二甲基硫(DMS)和二甲巯基丙酸(DMSP)生物生产的干扰,分别于2005年8月、11月对胶州湾海域进行采样。测定结果表明:胶州湾海水中8月DMS、DMSPd和DMSPp在次表层的平均含量分别为4.89,17.9和23.93nmol·L-1,在微表层中的平均含量分别为4.58,19.98和21.49nmol·L-1,11月DMS、DMSPd和DMSPp在次表层的平均含量分别为2.07,12.99和16.74nmol·L-1,在微表层中的平均含量分别为1.44,16.13和19.62nmol·L-1。DMS和DMSP的水平分布由于受到陆源输入的影响,呈现出自湾内向湾外递降的趋势。DMS和DMSP的含量夏季高于秋季。DMS和Chl-a在每个季节具有一定的相关性。DMS浓度的增加导致DMS通量增加。对海水微表层和次表层的研究表明,DMS和DMSPp并未在微表层中富集,而DMSPd有一定程度的富集。DMS,DMSP,Chl-a在海水微表层和次表层之间浓度分布的相关性体现了2层水体之间存在强烈的交换作用。

Spatial and temporal distributions of dimethylsulfide（DMS）and its precursor dimethylsulfoniopropionate（DMSP）were surveyed in the surface microlayer and subsurface water of the Jiaozhou Bay during August and November 2005.The factors which influenced the distributions of DMS and DMSP were discussed.In August,average microlayer water concentrations of DMS,DMSPd and DMSPp were 4.89,17.9 and 23.93nmol？？L-1,respectively,and those in the subsurface water were 4.58,19.98 and 21.49nmol？？L-1.In November,the mean concentrations of DMS,DMSPd and DMSPp in the microlayer were 2.07,12.99 and 16.74nmol？？L-1,respectively,and those in the subsurface seawater were 1.44,16.13 and 19.62nmol？？L-1.The concentrations of DMS and DMSP showed a gradually decreasing trend from inner bay to outer bay,which was attributed to the effect of terrestrial runoff.The average concentrations of DMS and DMSP in August were higher than those in November.The concentration of DMS was correlated with chlorophyll-alevel in each cruise.Anthropogenic input caused the increase in the DMS concentration in Jiaozhou Bay,so led to the increase in the sea-to-air flux of DMS.In this study,only DMSPd was found to be enriched in the microlayer and the extents of enrichment of DMS and DMSPd were relatively small.In addition,the results showed that the concentrations of DMS,DMSPd and DMSPp in the microlayer were closely correlated with those in the corresponding subsurface water,further demonstrating that there was a strong exchange between the two water bodies in the bay.