廉州湾及其邻近水域初级生产力研究     

吕瑞华  夏滨  毛兴华 《海洋科学进展》1995,(2)

１９９２～１９９３年，在对廉州湾及其邻近海域的环境调查中，首次对该海区叶绿素ａ与初级生产力进行了测定。获得叶绿素ａ的春季平均值为１．００ｍｇ·ｍ－３，秋季为０．２９ｍｇ·ｍ－３，初级生产力的平均值为３０１．５ｍｇ·ｍ－２·ｄ－１。文章对调查区初级生产力的分布特征及变化规律进行了探讨，并与北方沿海的初级生产力水平进行了比较。  相似文献   

渤海湾沿岸泥炭沼泽形成机制与时空分布   总被引：4，自引：0，他引：4  

李汉鼎  王升忠 《海洋地质与第四纪地质》1995,15(2):11-16

渤海湾沿岸的海陆过渡带，优越的水文地理环境有利于泥炭沼泽的形成与发育。海洋海退导致的海岸线变迁，是控制泥炭沼泽发育时间和空间分布的主导因素。间冰期和冰后期的海面上升期间，自海向陆发育了海侵基底泥炭；中全新世高海面期，在山前扇缘洼地和沟谷有泥炭沼泽发育；晚全新世海面下降期，泥炭沼泽主要发育在沿岸的海湾、泻湖、三角洲汊河间洼地及平原上的河滩、阶地、古河道等地。  相似文献   

胶州湾海域水质预测   总被引：3，自引：0，他引：3  

孙英兰  孙长青  王丽霞  徐鸿楷 《中国海洋大学学报(自然科学版)》1994,(Z1)

在已建潮流模型的基础上,用ADI法建立了胶州湾扩大域变动边界的平流—扩散输运模型,以COD为指示因子,预测了胶州湾海域1995年、2000年的水质、青岛环海公路海上段、沧口区北半部污水截流、北水南调、集中排放以及胶州湾西部经济开发对海域水质的影响等。为青岛市环保部门制定环保规划提供决策依据。  相似文献   

Copepod grazing during spring blooms: Can Pseudocalanus newmani induce trophic cascades?     

Andrew W. Leising  James J. Pierson  Claudia Halsband-Lenk  Rita Horner  James Postel 《Progress in Oceanography》2005,67(3-4):406

During late winter and spring of 2002 and 2003, 24 two- to three-day cruises were conducted to Dabob Bay, Washington State, USA, to examine the grazing, egg production, and hatching success rates of adult female Calanus pacificus and Pseudocalanus newmani. Here, we discuss the results of our grazing experiments for P. newmani. Each week, we conducted traditional microzooplankton dilution experiments and “copepod dilution” experiments, each from two different layers. Grazing was measured by changes in chlorophyll concentration and direct cell counts. Clearance rates on individual prey species, as calculated by cell counts, showed that Pseudocalanus are highly selective in their feeding, and may have much higher grazing rates on individual taxa than calculated from bulk chlorophyll disappearance. The grazing rates of the copepods, however, are typically an order of magnitude lower than the grazing rates of the microzooplankton community, or the growth rates of the phytoplankton. P. newmani ingested diatoms, but, at certain times fed preferentially on microzooplankton, such as ciliates, tintinnids, and larger dinoflagellates. Removal of the microzooplankton may have released the other phytoplankton species from grazing pressure, allowing those species’ abundance to increase, which was measured as an apparent “negative” grazing on those phytoplankton species. The net result of grazing on some phytoplankton species, while simultaneously releasing others from grazing pressure resulted in bulk chlorophyll-derived estimates of grazing which were essentially zero or slightly negative; thus bulk chlorophyll disappearance is a poor indicator of copepod grazing. Whether copepods can significantly release phytoplankton from the grazing pressure by microzooplankton in situ, thus causing a trophic cascade, remains to be verified, but is suggested by our study.  相似文献   

河口区治江围涂对杭州湾水动力及海床影响分析   总被引：5，自引：2，他引：5  

倪勇强  林洁 《海洋工程》2003,21(3):73-77

自二十世纪六十年代起，钱塘江河口进行了大规模治江围涂，人类活动对杭州湾水域的影响越来越为人们关注。基于实测资料的分析和潮汐水流数学模型计算，探讨了钱塘江河口区围涂对杭州湾水域潮汐水流和海床的影响。研究成果可为钱塘江河口和杭州湾的进一步开发治理和环境保护提供科学依据。  相似文献   

钦州湾潮流特征分析   总被引：9，自引：0，他引：9  

邱绍芳  侍茂崇  陈波 《海洋通报》2003,22(3):9-14

根据1994年5月和11—12月两个航次的调查及近年有关海湾的海流观测资料，分析了钦州湾的潮流特征，观测资料来自分布于该海湾东中西三个航道及相关区域的8个测站。钦州湾涨落潮流特征：落潮流速大于涨潮流速：东部最大涨落潮流速小于西部：夏季落潮流总是大于冬季：龙门水道附近的流速最大，而其余区域的流速相对较小。外湾(钦州湾)余流，是气旋式环流：水体东进而西出。从湾内来的泥沙和污染物质，主要从西部进入外海；中、东槽是主要“进水”通道，外海低泥沙含量、少污染物质的清洁水从这里潮流而上。因此，与西部相比，东部盐度高，水质清洁，底质重金属含量少。  相似文献   

Current status of bacteriological parameters and DOC/POC in Xiamen coastal waters   总被引：2，自引：0，他引：2  

Khalid Maskaoui  Tianling Zheng  Huasheng Hong  Zhiming Yu  Zhong Hu  Yun Tian  Lizhe Cai 《海洋学报(英文版)》2003,22(3):443-451

The surface and bottom waters samples were collected from six locations in Xiamen western sea. The quantified estimation of bacterial production (3H-thymidine method) and observation of bacterial heterotrophic activity (14C-glucose method) have been made in order to have a better understanding of the role of marine bacteria and their activities. The results showed that the mean value of bacterial heterotrophic activity was 9×108 cells/(L.h) in the surface waters and 2.6×108 cells/(L.h) in the bottom waters. The mean value of bacterial production was 38×108 cells/(L.h) in the surface waters and 7.1×108 cells/(L.h) in the bottom waters. The relationship between bacterial production, heterotrophic activity, POC and DOC measured during this survey were discussed. The good understanding of the relationship between bacteria activity and total coliform was addressed.  相似文献   

Distribution of dissolved organic carbon in and near the Prydz Bay, Antarctica     

Qiu Yusheng  Chen Min  Huang Yipu  Liu Guangshan 《海洋学报(英文版)》2003,22(4):547-556

INTRODUCTIONDissolvedorganiccarbon (DOC)makesupthesecondlargestofthebioactivepoolsofcar bonintheocean ,secondtothelargestpoolofdissolvedinorganiccarbon .Theglobaldissolvedorganiccarbonpoolisestimatedtobe 6 85Gt,avaluecomparabletothemassofCO2 intheat mosphere (Hedges,1 992 ) .Thesizeofthereservoir,aswellasitsdynamics ,indicatesthatDOCplaysacentralroleintheoceancarboncycle .AsitrelatestogreenhousegasessuchasCO2 andassociatesclimatecycle ,oceanicDOCbiogeochemicalcycleshavebeenoneoftheh…  相似文献   

对应分析在法国Douarnenez海湾拟庸鲽食性研究中的应用(Ⅱ)     

林学群  ChristianDENIEL  AlainLAUREC  FranoiseLEMENN 《海洋科学》1994,18(1):29-32

２．４拟庸蝶食性的对应分析２．４．１观察量和变量的分组观察量（捕食鱼类）依不同季节（冬、夏季）、不同性别（雌雄性）和不同性成熟状态（幼鱼和成鱼）来分组，因此得到８（２３）个观察量。对应分析的变量（饵料）首先根据个体生态的不同分为６个类型：游走多毛类，隐居多毛类，双壳类，不大游动的甲壳类（端足目和等足目），爬行甲壳类（十足国短尾部）和棘皮动物。其他６个类型的饵料生物（类、纽虫类、小型游泳甲壳类、腔肠动物、鱼类及苔藓虫类顺在分组时剔除，其原因为它们的出现可能少了些。考虑到捕食鱼类和饵料双壳类贝壳厚度…  相似文献   

东山湾重矿物组合规律、物质来源及环境意义     

陈华胄  郭允谋 《海洋科学》1994,18(2):40-44

阐明了东山湾重矿物组合规律，物质来源，自生黄铁矿的富集与形成环境。研究表明，湾内重矿物含量＜１％，来自漳江及周边水系。东山湾西部的沉积环境有利于自生黄铁矿的形成。  相似文献