东海二甲基硫丙酸的分布及其制约因素的初步研究  

DISTRIBUTION OF DIMETHYLSULPHONIOPROPIONATE AND ITS CONTROLLING MECHANISM IN THE EAST CHINA SEA

作　　者：焦念志[1] 柳承璋[1] 陈念红[1] 

机构地区：[1]中国科学院海洋研究所,青岛266071

出　　处：《海洋与湖沼》1999年第5期525-531,共7页Oceanologia Et Limnologia Sinica

基　　金：国家杰出青年基金!39625008;国家自然科学基金!39570143

摘　　要：于1994年4月对东海水域二甲基硫面酸（DMSP）浓度进行观测，结合对叶绿素和营养盐的监测结果，分析研究了DMSP分布及其调控因素。结果表明，DMSP浓度范围为0.17-5．66nmol／L，最高浓度出现于410站（125.0°E，29．3°N）。垂直分布浓度最大层出现在表层20m以内。DMSP分布与叶绿素a的分布基本一致，与硝酸氮（NO3－N）的关系在NO3－N浓度小于0.5μmol／L时是正相关，而在NO3－N浓度高于10μmol／L时呈负相关。Investigation into the distribution of dimethylsulphoniopropionate (DMSP) in the EastChina Sea was conducted in April 1994. DMSP was converted to dimethylsulfide by alkalization andthen measured by the head-space GC FPD method. DMSP concentration ranged from 0. 17-5.66nmol / L, with the highest value occurring in the front area (around central of the sea, 125.0°E29.3°N) between the coastal water and the Kurshio currenL From this peak center, DMSPconcentation decreased gradually towards the estuary of the Changjiang fover and towards theKuroshio oceanic waters. A significant correlation between DMSP and chlorophyll-a was recorded,indicating tha DMSP concenthation was associated with phytoplankton abundance. In verticaldistribution, DMSP concentration peaked within the surface 20 meters, then decreased sharply withincreasing depth. DMSP concentration depth profiles were sindlar to those of chlorophyll-a.Unlike the situation of previous laboratory experimental studies on the controIling mechanisms ofDMS production from algal cells, no significant coerelation was found between DMSP concentrationand any physical parameters such as tempeature and salinity. In contrase DMSP concentration hadinteresting relationships with nutrient availability in the study area. When ambient concentrations ofnitrate were lower than 0.5μmol / L, DMSP was significantly correlated to nitrate, DMSP had adecrease bend with increasing nitrate when nitrate concenhations were higher than 1.0μmol / L.Close correlations among DMSP, chlorophyll-a and nitrate in the former cirumstance implies thatnjtrate might control the distribution of DMSP through regulating phytoplankton growth undernitrate-deficientcondihons. In the later case, the inverse relationship between DMSP and nitrate waslikely due to the substitution of DMSP by glycine betainc as an osmoregulatory substance whennitrate was relative abundant. Thus, a speculation of dual charater of the effects of nitrate onnatural DMSP abundance was proposed that nitrate, depending on its availabil

关 键 词：二甲基硫丙酸 叶绿素α 硝酸氮 东海 

分 类 号：Q945.11[生物学—植物学] Q178.531