陆源营养盐输入对青岛近岸海域DMS生物生产的影响

Influence of Terrestrial Nutrient Input on Biogenic Production of Dimethylsulfide in Qingdao Coastal Water

近海海域是全球DMS的重要排放源 ,同时近海海域 ,尤其是城市近岸海域是生态环境受人为干扰最为严重的区域 .为了解人为活动对DMS生物生产的干扰 ,以青岛近岸海域为研究区域 ,在 2 0 0 1～ 2 0 0 2年进行了不同季节的采样 .发现该区域DMS存在季节变化 ,在生物量高的夏季 ,水体的DMS浓度也最高 ;高营养盐区域DMS/Chla(单位叶绿素的DMS产量 )低 ;低透明度区域DMS/Chla也较低 ,且在长日照的夏季 ,透明度与DMS/Chla有显著相关关系 .

Nearshore water is one of the most important emission area of dimethylsulfide(DMS),at the same time,nearshore water is highly disturbed by human activities.The objectives of this study were to investigate the DMS concentration of coastal water and try to analyze the factors governing its distribution.Four situ investigations were made in the coastal water of Qingdao,which is located at west coast of Yellow Sea.DMS concentrations of surface water showed a clear seasonal variation with peak values during the summer.Spatial and temporal distributions of DMS in three studied areas(havey polluted area,light polluted area,and clean area)were irregular,but when the concentrations of DMS were moralized to chlorophyll a as a measure of phytoplankton biomass,there was significant difference of DMS/Chl a among the three areas,with the nutrient concentration improved,the DMS/Chl a decreased.And there was the positive relation between transparency and DMS/Chl a,especially in summer.