可溶性Fe对中尺度海洋围隔生态系中浮游生物群落数量变动的影响

作者首次应用3个中尺度海洋实验生态系围隔装置研究可溶性Fe 对浮游生物群落数量变动的影响。结果表明:添加10和50μg/dm~3的可溶性Fe,均大大促进了浮游植物,特别是硅藻类中中肋骨条藻(Skeletonema costatum)的生长。但浮游植物的过量繁殖并没有导致生态系中滤食性桡足类数量的增加。     

鲈鱼土池人工育苗研究

报道了１９８９－１９９３年鲈鱼土池人工育苗的研究结果，捕自天然海区、围垦内 网箱培育的亲鱼注射ＬＲＨ－Ａ与ＨＣＧ诱导能顺利排卵，产卵率７０－１００％，受精卵卵径１．２５－１．４０ｍｍ，浮性卵、受精率２１－８９．０％，在水温１８．０－２１．２℃、盐度３１．０－３４．０的条件下，一般经５０．６７ｈ孵出仔鱼，孵化率４６．０－９０．０％。人工育苗在室外土池进行，最高成活率１１．７％。初孵仔鱼全长３．５３－     

The different behaviour of modeled ocean circulation under an atmosphere with different heat capacity

We examine the difference in modeled thermohaline circulation under an atmosphere with no heat capacity (NHC) and infinite heat capacity (IHC) in a series of numerical experiments using the Bryan/Cox OGCM. An NHC atmosphere allows ocean sea surface temperatures to respond to changes in oceanic poleward heat transport, inferring an atmosphere that is allowed to seek its equilibrium temperature, whereas an IHC atmosphere does not. This is responsible for the following different behaviour patterns under the two atmospheres: 1) under NHC atmosphere, oceanic thermal oscillation persists, whereas under IHC atmosphere it does not; 2) under NHC atmosphere, the oceanic thermohaline circulation is less sensitive to high latitude freshening than under IHC atmosphere; 3) under either atmosphere, multiple equilibrium solutions are possible. However, under NHC atmosphere, two equilibria of the thermohaline circulation are generated in the same way as in the GFDL fully coupled model, while under IHC atmosphere, they are not.     

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

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