鲁南沿海沉积物分布规律的研究     

李玉瑛  沈渭铨  章伟 《中国海洋大学学报(自然科学版)》1997,(4)

根据１５００多个表层底质样品分析资料，将本区沉积物分为１２种主要类型，并结合其他资料阐述沉积物分布特点。根据重力取样管，钻孔及浅地层资料，分析研究了沉积物厚度和来源。利用计算所得的沉积物结构参数（ＭＤΦ、ＱＤΦ、ＳＫΦ）分析了沉积环境，探讨了沉积物粒度特征和沉积机理。  相似文献   

长江口以南我国沿岸海域经济贝类中的重金属   总被引：11，自引：0，他引：11  

郑长春  詹秀美  唐文兴  许昆灿 《台湾海峡》1995,14(3):262-268

本文报道了长江口以南我国沿岸海域经济贝类中各重金属的含量及其分布趋势。结果表明，各种贝类体内Zn的含量总是最高，Hg的含量总是最低。各重金属平均含量一般呈Zn＞Cu＞As≈Cd＞Cr≈Pb＞Hg的排列顺序。该海域牡蛎的Hg、Pb、Cr、As的含量低，区域分布较均匀；Cu、Zn、Cd的含量相差悬殊，以珠海海区牡蛎的Cu、Zn、Cd含量最高，分别为431×10-6～474×106，864×10-6～1044×10-6，7．02×10-6～8．25×10-6（m／m），其主要原因可能是工业排污造成的。本调查牡蛎分布较广，对Cu、Zn、Cd有较强的积累能力，推荐它为我国局部海域海洋污染监测Cu、Zn、Cd的指示生物。  相似文献   

南沙群岛海区有机碳沉积作用与古生产力估算   总被引：1，自引：0，他引：1  

吴时国  涂霞  罗又郎  郑范 《热带海洋学报》1995,(4)

根据南沙群岛海区５个沉积柱样和大量表层样的分析资料讨论了有机碳的沉积作用。深海有机碳含量一般为０．２％－１．３％。水柱深度对其分布的控制作用不明显。分析结果发现冰期、间冰期，尤其是本次冰期有机碳含量变化明显，４个柱样晚第四纪的质量堆积速率在末次冰期时最大。有机碳保存的主要控制因素是溶解氧浓度、粘土矿物含量、水柱深度和底栖混合强度，其中溶解氧浓度是最重要因素。底栖有孔虫的相对丰度，如Ｕｖｉｇｅｒｉｎａ和Ｂｕｌｉｍｉ－ｎａ，可用来指示溶解氧和有机碳含量。有机碳含量与海洋生产力关系极为密切，它可用来重建海洋古生产力的长期变化。采用Ｍｌｌｅｒ和Ｓｕｅｓｓ方程以及Ｓａｒｎｔｈｅｉｎ方程的计算结果与目前生产力值结果比较表明，后一种方法因充分考虑了溶解氧浓度和水柱深度而更接近现代值。  相似文献   

热带太平洋西部及赤道暖水区的初级生产力   总被引：1，自引：2，他引：1  

陈兴群  张明  陈其焕 《海洋学报》2002,24(1):86-95

描述了对热带太平洋西部(1991年11月WOCE调查)及赤道暖水区(1992年11月至1993年2月的TOGA-COARE调查)的叶绿素a分布和初级生产力(C),及其与理化环境的关系.西部海域叶绿素a平均总量达19.79mg/m2,暖水区为2.168mg/m2;暖水区的潜在初级生产量高于西部海域,量值分别为228mg/(m2·d)和171mg/(m2·d),次表层最大值成为调查海域水体叶绿素a分布的一个明显特点.叶绿素a总量平面分布趋向表明:高生物量主要位于巴士海峡邻近、菲律宾以及伊里安岛的近岸站位,此外,在2°～4°N之间的观测区.低生物量主要位于外洋海域.生物量的分布与不同海域的物理过程变化有关,而海水涌升可能是导致温度、盐度和营养盐分布产生变化,并因而导致高生物量的一个重要的物理过程.  相似文献   

极浅海域潮流数值模型   总被引：9，自引：0，他引：9  

张存智  杨连武  窦振兴 《海洋与湖沼》1994,25(6):671-676

通过对以往的浅水环流数值模型进行改进，建立适用于极浅水域的且能达到较高分辨率的潮汐环流数值模型。模型的主要特点是：（１）通过改进海底摩擦项的表达式来克服传统的二次方律在极浅的潮滩区所产生的不稳定问题；（２）采用逆风格式处理动量方程中的平流项，有效地抑制由于岸边界移动引起的数值短波的扩散。结合老虎滩湾海上工程的需要，利用本模型进行一系列的数值模拟试验。经过实测资料验证表明，改进后的模型具有良好的稳定  相似文献   

Characteristics of sulfate in atmosphere over Xiamen waters and its fluxes to waters     

Huang Ziqiang  Zhang Yuanhui  Chen Liqi 《海洋学报(英文版)》1993,12(4):585-595

One hundred and seven marine aerosol samples were collected during December 1988 to March 1990, and 3 dry deposition samples, 16 rain samples and 2 Cascade Impacter samples were collected from March to May 1990 at the southeast coast of the Xiamen Island. All the samples were analyzed for SO42-, NO3-, Cl-, Na+ , NH4+, using ion chromatography.The results indicate that the concentration of sulfate in marine aerosols over the Xiamen waters appears to be of seasonal variation, in an order of winter > spring > autumn > summer. The mean sulfate concentration lor the total marine aerosol samples over the Xiamen waters is 9. 37 μg/m3, respectively 0. 89 and 8. 48 μg/m3 for the seasalt and non-sea-salt sulfate. The distribution of sulfate shows a bimodal form with a peak in the coarse particle range which is derived from the sea-salt sulfate, and a peak in the fine particle range which is derived from the non-sea-salt sulfate. The total deposition of sulfate to the Xiamen waters is estimated to be 4. 68g/m2   相似文献   

Summer Phytoplankton Physiognomy in Coastal Waters of the Gulf of Naples     

Adriana  Zingone  Marina  Montresor Donato  Marino 《Marine Ecology》1990,11(2):157-172

Abstract. Thirteen sampling cruises were conducted at weekly intervals in the inner part of the Gulf of Naples in the summer of 1983 to investigate the effects of excess nutrient inputs on phytoplankton communities. High surface phytoplankton concentrations (up to 1.15 ×10⁸ cells 1^-1) were recorded, particularly near Naples harbour and along the eastern coast, two locations that receive most of the area's sewage and industrial discharge. Phytoplankton populations were generally dominated by small species, mainly diatoms, which were associated with small phytoflagcllatcs. Species diversity values were relatively high (H'≤ 3.62) in most samples. Throughout the sampling period a high spatial and temporal variability for phytoplankton abundances and species composition was observed.  相似文献   

Study on copper complexing ligand concentrations in several China''s coastal waters     

GONG Haidong  ZHANG Zhengbin  LIU Chunying  LIU Liansheng 《海洋学报(英文版)》2006,25(1):64-77

Copper complexing ligand concentrations in the Daya Bay, Qingdao coast, Jiaozhou Bay, South China Sea and Huanghe Estuary waters were determined by the anodic stripping voltammetry technique. The distribution regularity and the relationship with other parameters were discussed. The results were as follows： Copper complexing ligand concentrations of the South China Sea were a little higher than those of other sea areas, and they were apparently higher than those of the ocean. Compared with the subsurface layer （SSL） in the sea surface microlayer copper complexing ligand concentrations showed an enrichment phenomenon, of which the mechanism is similar to dissolved organic matter. The metal complexing ligand concentration profiles of the South China Sea showed that the value in the sea surface was the highest, then it decreased with depth accruing, and a higher value appeared at the bottom. Copper complex- ing ligand concentrations were higher than those of cadmium and lead. Ligands in each sea area exhibited a complicated property. In short, the distribution regularity of copper complexing ligand concentrations in China＇s coastal waters was consistent with that of other regions in the world. Meanwhile, the positive relationship between the copper complexing ligand concentrations and biological oxygen demand, chemical oxygen demand, dissolved organic carbon, and viscosity were found clearly.  相似文献   

南沙群岛海区秋季浮游植物物种多样性及数量变化   总被引：3，自引：0，他引：3  

李开枝  郭玉洁  尹健强  黄良民 《热带海洋学报》2005,24(3):25-30

根据1997年11月南沙群岛海区的调查资料,对调查海区的浮游植物种类组成、优势种、物种多样性及数量分布特点进行了初步分析。鉴定网采浮游植物共121种,隶属2个门类33属。垂直分层0—75m和75—150m浮游植物细胞数量平均值分别是0.070×104cells·m-3和0.044×104cells·m-3。0—75m层浮游植物细胞数量的高值区出现在调查海区的东部和东南部,最高值出现在安渡滩附近的21号站;75—150m浮游植物细胞数量高值区出现在32号站附近。垂直分布的明显特点是随深度增加浮游植物种类和数量呈减少趋势。三叉角藻Ceratiumtrichoceros和夜光梨甲藻Pyrocystisnoctiluca是0—75m层和75—150m层共有的优势种。0—75m层和75—150m层浮游植物Shannon-Wiener多样性指数平均值分别为3.40和2.07,均匀度平均值分别为0.79和0.60。研究结果表明,秋季浮游植物细胞数量比春、夏季低,浮游植物由硅藻、甲藻组成,甲藻在数量和种类上都占优势。初步探讨了南沙群岛海区秋季浮游植物种类和数量分布与营养盐、温度与盐度、海流及浮游动物等环境因子的关系。  相似文献   

Biomarker responses to pollution in two invertebrate species: Scrobicularia plana and Nereis diversicolor from the Cádiz bay (SW Spain)     

Erkuden Prez  Julian Blasco  Montserrat Sol 《Marine environmental research》2004,58(2-5):275

The clam Scrobicularia plana and the polychaete worm Nereis diversicolor were collected in several sites from a littoral enclosure in SW Spain. The aim of our study was to relate various biomarker responses in these species to a pollution gradient caused by untreated domestic discharges and to verify the adequacy of the selected species as sentinels in this habitat. The biomarkers selected were the antioxidant enzymes catalase (CAT), glutathione peroxidase (GPX) and DT-diaphorase (DT-D). In addition, the activities of cytochrome P450-dependent ethoxyresorufin O-deethylase (EROD) activity, the phase II detoxifying enzyme glutathione S-transferase (GST) and the neurotoxicity marker acetylcholinesterase (AChE) were measured. Metallothionein levels were selected as biomarkers of heavy metals exposure in both species. The results suggest a different response in the water filtering organism (clam) and the sediment eater (polychaete), probably as a consequent of different pollution exposure and that samples from the “Caño Sancti-Petri” were exposed to biologically active compounds that altered some of their biochemical responses. AChE was the most sensitive biomarker in both species and N. diversicolor proved to be a more robust sentinel in this ecosystem.  相似文献