Non-destructive γ spectrum analysis of polymetallic nodules from the eastern Pacific

Non-destructive 7 spectrum analyses of 20 polymetallic nodules from the eastern Pacificwere carried out. Numerous nuclides, such as 238U,230Th,226Ra,210Pb,228Ra,228Th,235U,227Ac (or 231 Pa) and 40K were detected. The count rates of the nuclides in the top or bottom side of nodules facing detector were measured and the ratio R of the count rates of nuclides in the top and the bottom sides was obtained. From counts and ratios, some useful information relating to the growth and movement of the nodules, the source of nuclide and relationship between those and environment can be gotten. A new method for clear distinction between the top and bottom sides of the nodule based on the R value of 226Ra or 210Pb was developed. In addition, one can infer the turnover of nodules according to the R value of 230Th.     

棱梭对饵料摄食与吸收利用研究

本文采用~(14)C标记技术测定棱梭幼体对褶皱臂尾轮虫、卤虫和亚心形扁藻等饵料的摄衾率、吸收率扣利用率,并以~3H-葡萄糖和~(14)-苯丙氨酸作示踪剂研究人工配合饵料中葡萄糖和氨基酸在棱梭体内转运和分布情况。结果表明,卤虫、褶皱臂尾轮虫都是棱梭幼体合适的饵料;氨基酸更多地参与了棱梭组织中的细胞代谢,而葡萄糖则是棱梭体内重要的能源物质。     

大亚湾红树林区底相大型动物的群落

本文据1987～1989年实地调查资料,研究了大亚湾红树林区底栖生物的种类组成与数量分布。结果表明,分布于湾顶5种红树林内的底栖生物70种,主要由多毛类(23种)、软体动物(23种)、甲壳动物(12种)和星虫动物(8种)组成;平均生物量219.77g/m~2,平均栖息密度281个/m~2;在数量上以软体动物的腹足类占优势。文中应用群落结构指数进行分析,并与九龙江口的作了比较。     

三斑海马的胚胎发育

海马的繁殖方式很特殊,对其育儿袋的生理和胚胎发育对环境的要求有人曾作过一些研究,但并未对其形态进行描述。T.B.尼科里斯基的《分门鱼类学》一书以及日本学者对日本海马繁殖的观察,均曾提到孵化后的幼鱼情况,然而资料很零星。除此之外,对海马胚胎发育的描述,尚未见有报道。为了对这种特殊繁殖方式的胚胎发育的特点有所了解,为海马养殖提供必要的资料,我们对三斑海马(Hippocampus Trimaculatus)的胚胎发育及其与温度的关系进行了观察和试验。结果如下。 本文所用材料同作者“三斑海马的生殖”一文。 胚胎发育的观察方法是:将交配受卵的雄体隔离饲养,然后,每隔一定时间从育儿袋中取出卵子进行观察;有的卵子在体外培育观察。     

Size-fractionated phytoplankton standing stock and primary production in the Bohai Sea during late spring

During June 1997 cruise by R/V Science No.l, observations on temporal and spatialvariations of the size-fractionated phytoplankton standing stock and primary production were carried out in the Bohai Sea. The size-fractionated chlorophyll a (Chl a) and primary production, photosynthet-ically available radiation (PAR), as well as the related physico-oceanographic and zooplanktonic parameters were measured at five time-series observation stations representing sub-areas of the sea. Results obtained show that there were the marked features of spatial zonation of Chl a and primary production in the Bohai Sea. The values in the Laizhou Bay, the Liaodong Gulf and the Bohai Gulf were high and showed close relation with tidal fluctuations, i.e. high Chl a concentration occurred during high tide in the Laizhou Bay, and during low tide in the Liaodong Gulf and the Bohai Gulf. In the strait and the central region of the Bohai Sea, the values were relatively low and no relationship with tidal fluctuation could be foun     

Preliminary study on concentrations and size distribution of marine aerosols over the East China Sea

In summer and winter, 1987,and in spring and autumn, 1988, the concentrations and size distribution of marine aerosols were measured over the East China Sea and the South Japan Sea. This paper deals with the study on the seasonal variation of the marine aerosols with the meteorological parameters, the differences and the relations between the marine and continental aerosols. The results show that the marine aerosol concentrations and size distribution over the East China Sea have distinct seasonal change characteristics, which may be attributed to the East Asian atmospheric circulation. The size distribution is discussed by using a three-parameter size distribution model.     

Study on the carbon flux in the South China Sea

ＳｔｕｄｙｏｎｔｈｅｃａｒｂｏｎｆｌｕｘｉｎｔｈｅＳｏｕｔｈＣｈｉｎａＳｅａ￥ＨａｎＷｕｙｉｎｇ；ＬｉｎＨｏｎｇｙｉｎｇａｎｄＣａｉＹａｎｙａ（ＲｅｃｅｉｖｅｄＭａｒｃｈ５，１９９５；ａｃｃｅｐｔｅｄＯｃｔｏｂｅｒ４，１９９５）Ａｂｓｔｒａｃｔ：Ａｃ...     

基于USB2.0的海床基自动监测平台数据接口单元的研究

采用EZ-USB FX2技术,设计开发了基于USB2.0的海床基自动监测平台数据接口方式。采用三态双向门电路控制存储器模块总线复用实现数据访问;采用直接内存读写方法完成数据传输;采用参数存储器完成参数设置。实验证明在数据传输、参数设置以及低功耗控制方面取得良好效果,提高了系统工作性能。     

南沙海面的夏季风和海—气通量分析

本文分析1984—1988年夏季南沙考察资料。结果表明:南沙海面夏季风来自南路和西路及本区的季风气流。季风潮的出现主要是南路气流加强或季风与热带气旋环流的相互作用。夏季风期间的天气形势、气象特征和海—气通量随季节和天气过程变化显著。     

Size fractionated biomass and productivity of phytoplankton and new production in the Prydz Bay and the adjacent Indian sector of the Southern Ocean during the austral summer 1998/1999

INTRODUCTIONComparedwithotheroceansintheworld ,thereisrelativelyhigherlevelofnutrients (ni trate ,phosphate ,silicate)intheSouthernOcean .Butprimaryproductivitiesarelow ,andnewproductionisalsoonlyinthemiddlelevelthere .Itiscommonlyconsideredthatthelowerpro ductivitiesintheSouthernOceaniscausedbylowtemperature ,lowlight,lowstabilityofwa ter,scarcityoftraceelementsuchasironandgrazingbyzooplankton (Burkilletal.,1 995) ,etc.ThemostexistedstudiesconcentratedontheAtlanticSectoroftheSouthernO…