Seasonal and spatial distributions of phytoplankton biomass associated with monsoon and oceanic environments in the South China Sea   总被引：5，自引：3，他引：2  

GAO Shan  WANG Hui 《海洋学报(英文版)》2008,27(6):17-32

Seasonal variations of phytoplankton/chlorophyll-a （Chl-a） distribution, sea surface wind, sea height anomaly, sea surface temperature and other oceanic environments for long periods are analyzed in the South China Sea （SCS）, especially in the two typical regions off the east coast of Vietnam and off the northwest coast of Luzon, using remote sensing data and other oceanographic data. The results show that seasonal and spatial distributions of phytoplankton biomass in the SCS are primarily influenced by the monsoon winds and oceanic environments. Off the east coast of Vietnam, Chl-a concentration is a peak in August, a jet shape extending into the interior SCS, which is associated with strong southwesterly monsoon winds, the coastal upwetling induced by offshore Ekman transport and the strong offshore current in the western SCS. In December, high Chl-a concentration appears in the upwelling region off the northwest coast of Luzon and spreads southwestward. Strong mixing by the strong northeasterly monsoon winds, the cyclonic circulation, southwestward coastal currents and river discharge have impacts on distribution of phytoplankton, so that the high phytoplankton biomass extends from the coastal areas over the northern SCS to the entire SCS in winter. These research activities could be important for revealing spatial and temporal patterns of phytoplankton and their interactions with physical environments in the SCS.  相似文献   

Distribution of nutrients and eutrophication assessment in the Bohai Sea of China   总被引：5，自引：1，他引：4  

王修林  崔正国  郭全  韩秀荣  王江涛 《中国海洋湖沼学报》2009,27(1):177-183

Water samples were collected in 120 stations in the Bohai Sea of China to analyze the distribution of dissolved nutrients and assess the degree of eutrophication in August 2002. The result shows that the average concentration of DIN increased and the PO4-P concentration sharply decreased compared to the previous data of corresponding period. The high concentrations of DIN and PO4-P occurred in coastal waters, especially in the bays and some river estuaries, while the high concentrations of SiO3-Si in the surface and middle depth occurred in the central area of the Bohai Sea. The average ratio of DIN/ PO4-P was much higher than the Redfield Ratio (16:1). Apparently, PO4-P was one of the limiting nutrient for phytoplankton growing in the sea. The average concentrations of DON and DOP were higher than their inorganic forms. The results of eutrophication assessment show that 22.1% of all stations were classified as violating the concentration levels of the National Seawater Quality Standard (GB 3097-1997) for DIN and only 3.9% for PO4-P. The average eutrophication index in the overall area was 0.21±0.22 and the high values occurred in Bohai Bay, Liaodong Bay and near the Yellow River estuary. This means that the state of eutrophication was generally mesotrophic in the Bohai Sea, but relatively worse in the bays, especially some river estuaries.  相似文献   

西津水库网箱养殖区浮游植物特征及水质营养状态   总被引：2，自引：0，他引：2  

吴铁军  王大鹏  何安尤  张益峰  雷建军  陈晓汉 《广东海洋大学学报》2009,29(4):89-94

于2006年10月至2008年7月对西津水库米埠坑网箱养殖区浮游植物进行两个年度共8次调查。第1年发现浮游植物6门53属,冬季出现种属最多,达到43属,春、夏季最少,为35属,浮游植物年平均数量为35.18×104 L-1,平均生物量为1.07 mg·L-1。第2年度采集到浮游植物6门47属,以春季出现种属最多,达到40属,夏季最少,为29属,第2年浮游植物年平均数量低于第1年,为19.77×104 L-1,生物量高于第1年,达到1.22 mg·L-1。综合营养指数评价结果显示,米埠坑网箱养殖区处于中营养水平,有向富营养化过渡的趋势。  相似文献   

闽东沿岸2004～2006年浮游植物生态特征研究     

丁页  林元烧  曹文清  杨圣云  李乃姜 《台湾海峡》2009,28(3):360-369

根据闽东海洋环境监测中心2004年-2006年阂东沿岸生态调查的资料，分析和研究了闽东沿岸浮游植物的生态特征．共鉴定出浮游植物的种类3个门39属共134种，其中硅藻门的种类占总种数的80％，为该调查海域主要门类．主要优势种是中肋骨条藻（Skeletonema costatum）、旋链角毛藻（Chaetoceros curvisetus）、尖刺拟菱形藻（Pseudo—nitzschia pungens）和丹麦细柱藻（Leptocylindrus danicus）等．浮游植物的丰度分布，呈现由调查海域东北侧向西南侧、由近岸向远岸减少的空间特征，夏季高、春季低的季节变化特点，并且有逐年减少的年际变化趋势．本调查海域浮游植物多样性指数较高，群落较稳定．  相似文献   

The black water around the Changjiang (Yangtze) Estuary in the spring of 2003   总被引：4，自引：0，他引：4  

BAI Yan  HE Xianqiang  PAN Delu  ZHU Qiankun  GONG Fang 《海洋学报(英文版)》2009,28(4):23-31

The Changjiang (Yangtze) Estuary is located in the East China Sea shelf with shallow water. Affected by the tide mixing and the runoff of the Changjiang River and the Qiantang River, the turbidity is very high. Generally, the water-leaving radiance is high in the turbid water because of the large particle scattering. Based on the in-situ data and ocean color remote sensing data of SeaWiFS, it was found that there was a black water region with the normalized water-leaving radiances less than 0.5 mW/(cm2·μm2·...  相似文献   

北黄海典型水域春夏季浮游植物的昼夜变化   总被引：1，自引：0，他引：1  

杨世民  刘光兴 《中国海洋大学学报(自然科学版)》2009,39(4)

根据黄海西北部2006年夏季3个连续站和2007年春季1个连续站垂直分层拖网的调查资料,研究了黄海西北部典型海区浮游植物的昼夜垂直变化.夏季共检出浮游植物79种,主要优势种为旋链角毛藻Chaetoceros curvisetus、梭角藻Ceratium fusus、三角角藻Ceratium tripos和具槽帕拉藻Paralia sulcata;春季检出51种,主要优势种为浮动弯角藻Eucampia zodiacus、具槽帕拉藻和尖刺伪菱形藻Pseudo-nitzschia pungens.夏季L01站受潮汐的影响各水层低潮期浮游植物细胞丰度高于高潮期,垂直分布趋势为表层细胞丰度最高,底层最低.而由于底栖硅藻的细胞再悬浮作用夏季L02、L03站和春季L02站底层细胞丰度高于表层,但各水层细胞丰度的昼夜变化相对较平缓.  相似文献   

微微型浮游植物的生态学研究进展   总被引：2，自引：1，他引：1       下载免费PDF全文

孙晓庆  董树刚 《海洋科学》2008,32(5):67-72

自1979年聚球藻(Synechococcus)被发现以来,对以前为人们知之甚少的微微型(粒径<2μm)、超微型(粒径<5μm)浮游植物的研究逐渐形成并日益发展起来,并成为当前海洋生态学研究的热点之一。到目前为止,这类广布于各种水体中的微小生物可分为聚球藻、原绿球藻(Prochlorococcus)和微微型真核浮游植物(eukaryotic picophyPlankton)3大类。  相似文献   

茂名放鸡岛海域浮游植物与赤潮生物研究     

冯波  卢伙胜  颜云榕 《海洋通报》2008,27(4)

2003年8月、12月,2004年2月、5月对茂名放鸡岛海域进行了浮游生物调查,分析了浮游植物物种组成、优势种及其细胞丰度分布和物种多样性.共鉴定出浮游植物36属57种(硅藻46种,甲藻11种),其中赤潮类生物22种.角毛藻属以及丹麦细柱藻、脆根管藻和尖刺伪菱形藻为全年主要优势种,在早春季节冰河拟星杆藻成为季节性优势种,5月份和8月份角毛藻属以及尖刺伪菱形藻和丹麦细柱藻的细胞丰度在放鸡岛周边局部水域超过107 m-3.放鸡岛海域浮游植物物种多样性指数和均匀度偏低,在合适的条件下,有可能形成硅藻赤潮.  相似文献   

粤东沿海养殖水域浮游植物的生态特征   总被引：10，自引：1，他引：9  

《广东海洋大学学报》2002,22(1):24-29

  相似文献   

珠海地区凡纳滨对虾淡水养殖池浮游植物群落的演替     

张才学  劳赞  廖宝娇  黎运积 《广东海洋大学学报》2006,26(4):35-41

对珠海凡纳滨对虾淡水养殖池塘浮游植物及其理化因子进行了调查和分析,结果表明:调查中共检出浮游植物143种,优势种主要有林氏藻、螺旋鱼腥藻、小颤藻、微囊藻和点状平裂藻等,物种多样性指数在0.24~2.77之间,优势度与多样性指数呈显著的负相关,相关系数r=-0.984;而均匀度与多样性指数呈显著的正相关,相关系数r=0.967,养殖后期优势度不高,浮游植物的密度及化学因子的浓度到后期都有所上升,藻类密度的剧烈变化会引起氨氮和硫化氢含量的变化;藻类密度的波动滞后于无机氮的波动,群落演替具有突发性、时间短、速度快等特点。  相似文献