渤海春季浮游细菌分布与生态环境因子的关系   总被引：11，自引：2，他引：11  

白洁  李岿然  李正炎  孙军  魏皓  刘素美  吴增茂 《中国海洋大学学报(自然科学版)》2003,33(6):841-846

研究了 1 999年 4～ 5月渤海水体浮游细菌分布与生态环境因子的关系。结果显示 ,渤海春季表层水体浮游细菌含量与水温和溶解性有机碳呈正相关 ,相关系数分别为 0 .6 0 1 (P<0 .0 1 )和0 .4 0 6 (P<0 .0 5 ) ,并与溶解氧含量呈负相关 ,相关系数为 0 .5 1 9(P<0 .0 1 ) ;底层水体浮游细菌含量与水温、溶解性有机碳 (dissolved organic carbon,DOC)、颗粒性有机碳 (particulate organic carbon,POC)和叶绿素 a含量呈正相关 ,相关系数分别为 0 .82 0 (P<0 .0 1 ) ,0 .6 6 1 (P<0 .0 1 ) ,0 .5 31 (P<0 .0 1 )和 0 .4 42 (P<0 .0 5 ) ,并与溶解氧含量呈负相关 ,相关系数为 0 .6 5 0 (P<0 .0 1 )。表明水温和DOC、POC含量是渤海水域浮游细菌含量的主要限制因子 ,而水体中的溶解氧 (dissolved oxygen,DO)含量与浮游细菌的含量有关  相似文献   

渤海莱州湾夏季悬浮体的分布和运移(英文)     

杨作升  王兆祥  郑爱芬  张经  瞿建忠 《中国海洋大学学报(自然科学版)》1989,(4)

本文以1985年夏季中法SCO—PSU联合黄河口调查第二航次所取的渤海莱州湾水深大于10米区域的悬浮体资料,研究了莱州湾内悬浮体的分布和运移规律,并讨论了它们与诸如黄河径流、潮流、环流、风和浪等动力因素之间的关系。  相似文献   

Changes in North Sea gadoid stocks   总被引：5，自引：1，他引：5  

Hislop  John R. G. 《ICES Journal of Marine Science》1996,53(6):1146-1156

  相似文献   

Distribution pattern of marine flagellate and its controlling factors in the central and north part of the Huanghai Sea in early summer     

Huang Lingfeng  Guo Feng  Huang Bangqin  Xiao Tian 《海洋学报(英文版)》2003,22(2):273-280

Abstract-A survey was carried out in the central and north part of the Huanghai Sea (34.5°～37.0°N, 120.5°～124.0°E) during June 12～27, 2000. It was found that the abundance of marineflagellate ranged from 45 to 1278 cell/ml, 479 cell/ml in average. Flagellate was more abundant in thecentral part than in the north part of Huanghai Sea, and the abundance decreased with the increasingdistance from the coast, showing a similar distribution pattern with isotherm. Vertically, high densityof flagellate was always presented in the bottom of thermocline, and formed a dense accumulation in thecentral area of the Huanghai Sea Cold Water Mass. The effects of physical and biological factors on thedistribution of marine flagellate in early summer were discussed. Water temperature (especially the ex-istence of thermocline) rather than salinity showed significant effect on the distribution pattern of marineflagellate in the Huanghai Sea in early summer. When comparing the abundance of marine flagellatewith that o  相似文献   

胶州湾中溶解态铝的初步研究   总被引：1，自引：0，他引：1  

谢亮  任景玲  张经  刘素美  魏皓 《中国海洋大学学报(自然科学版)》2007,37(1):135-140

本文利用改进的铝-荧光镓(Al-LMG)荧光光度法测定了2001年夏季和秋季胶州湾水样中的痕量溶解态铝,分析了夏、秋季胶州湾内溶解态铝的分布及其影响因素,在此基础上讨论了胶州湾中悬浮颗粒物对溶解态铝的贡献,并进一步探讨了溶解态铝在研究水团运动中的作用。计算了河流输入、大气干、湿沉降向胶州湾中溶解态铝的输送,及湾内外交换对胶州湾内溶解态铝的影响和胶州湾铝的存留时间。  相似文献   

南方鲇的排粪量及消化率同日粮水平、体重和温度的关系   总被引：19，自引：0，他引：19       下载免费PDF全文

谢小军  孙儒泳 《海洋与湖沼》1993,24(6):627-633

于１９８８年２月－１９８９年２月测定了南方鲇幼鱼的排粪量，从而估算共消化率。结果表明，当水温为２５℃时，在日粮水平分别是体重的１％，２％，４％和达饱食的条件下，平均消化率分别为摄入食物能量的８０．３２％，８４．９４％，８８．４０％ｔ ８７．２７％；在平均初始体重分别为８．７２，２５．４３，４５．１６，７８．１８和１２７．５ｇ的实验组中，平均消化率分别为８６．５９％，８１．１５％，９０．３８％，８６  相似文献   

渤海湾海域硝化、亚硝化细菌的生态研究   总被引：4，自引：0，他引：4  

赵海萍  陶建华  李清雪 《海洋技术学报》2005,24(4):44-49

于2004年8月和10月对渤海湾海域进行了两次硝化菌群的生态学调查。结果显示,在渤海湾水体中,8月份硝化细菌的数量在(1.6~300)×104个/L之间,10月份硝化细菌的数量在(0.5~30)×104个/L之间;8月份亚硝化细菌的数量在(1.1~160)×104个/L之间,10月份亚硝化细菌的数量在(0.5~30)×104个/L之间。8月份硝化细菌与磷酸盐有高度明显的相关性(0.01水平),与氨氮、水温、溶氧量都有较明显的相关性(0.05水平);10月份细菌数仅与溶氧量有较明显的相关性(0.05水平)。8月份亚硝化细菌数与各环境因子相关性不明显;10月份亚硝化细菌数与磷酸盐、pH值及溶氧量的相关性都是在0.01水平上;而且与亚硝酸盐、硝酸盐、氨氮有明显的相关性,都在0.05水平上。  相似文献   

The Gambia River estuary: A reference point for estuarine fish assemblages studies in West Africa   总被引：3，自引：1，他引：3  

Monique Simier  Charline Laurent  Jean-Marc Ecoutin  Jean-Jacques Albaret 《Estuarine, Coastal and Shelf Science》2006,69(3-4):615

The Gambia River is one of the last aquatic ecosystems in West Africa that has not yet been affected by strong environmental changes and human disturbances. In contrast to the neighbouring Casamance and Sine Saloum estuaries, the Gambia estuary is free of major climatic perturbation and remains a “normal” estuary, with a salinity range from freshwater to 39. The present paper aims to study the spatial and seasonal variability of fish assemblages in this estuary in terms of bio-ecological categories and of their relation with some environmental variables. Four surveys were conducted, from June 2001 to April 2002, in order to cover the major hydroclimatic events, at 44 sampling sites along the lower, intermediate and upper zones of the Gambia estuary (up to 220 km). Fish assemblages were sampled using a purse seine net, fish were identified to species level and environmental variables such as water depth, transparency, salinity, temperature and percentage oxygen saturation were measured. The main spatial structure of the fish assemblages and its seasonal changes were first studied using the STATIS-CoA multitable method. The combination of fish assemblages and environmental variables was then analysed using the STATICO method, designed for the simultaneous analysis of paired ecological tables. A total of 67 species were observed, belonging to all bio-ecological categories characterizing West African estuaries. The marine component of the community was largely dominant throughout the estuary, while the freshwater component was permanently observed only in the upstream zone. The main spatial structure was a longitudinal gradient contrasting marine and freshwater affinity assemblages, with strong seasonal variations. The most complete gradient was observed in December, at the beginning of the dry and cool season, while in June, at the end of the dry and warm season, there was the least structured gradient. The role of salinity, always correlated with temperature, was emphasized, while turbidity appeared to be another important factor. Oxygen and depth did not play a major role at the estuary scale. The relative importance of the bio-ecological categories varied according to the season and the distance to sea. Stable fish assemblages were observed in the lower zone at the end of the dry season, in the upper zone during the flood and in the middle zone throughout the year. In some situations, a relative inadequacy between fish assemblages and their environment was noticed. The present study contributes to the definition of the functioning of a “normal” West African estuary, the Gambia estuary, with balanced effects of marine and freshwater influences and the presence of all bio-ecological categories. The Gambia estuary can therefore be considered to be a reference ecosystem for further comparisons with other tropical estuarine ecosystems, subjected to natural or artificial perturbations.  相似文献   

嫩江上游第四纪砂金矿控矿条件和富集规律的初步研究   总被引：2，自引：1，他引：2  

王瑞山 《海洋地质与第四纪地质》1996,16(4):87-94

在论述了嫩江上游区域地质背景后，总结了该区砂金矿形成的控矿条件和富集规律。提出了决定砂金矿形成的主要因素是丰富的砂金物质来源，有利的外营力作用，适宜的新构造运动和良好的沉积环境，而且要经历搬运－沉积、再搬运－再沉积的复杂过程，才能达到工业要求的富集程度。  相似文献   

岸式波力发电装置水动力性能试验研究     

刘月琴  武强等 《海洋工程》2002,20(4):93-97

通过模型试验研究,得到海岸岸坡、气室宽度与频率响应和吸能效率之间的关系和规律,验证了一种理论计算方法的可靠性,证明该计算方法对波能电站的设计和工程选址有一定的参考价值。  相似文献