渤海中部海底恒温层温度及泥温相位随深度变化特征   总被引：2，自引：0，他引：2  

刘文通  徐德伦  王正林  宋珊  吴述礼 《海洋与湖沼》1995,26(5):460-465

利用渤海中部两点一年中４个季节泥温观测资料，近似确定两测点海底恒温层泥温分别为１１．０℃和１１．７℃。认国泥温随深度变化可视为一垂向波－泥温波，并利用这一概念分析了泥温相位随深度变化特征，８＾＃，Ａ（Ｂ）平台测点泥温波波长分别为ｌ８＝８ｍ和ｌＡ（Ｂ）＝１０ｍ。研究建议，以０．５ｍ处多年泥温平均值作为海底恒温层温度。  相似文献   

Growth Dynamics, Production, and Nutrient Status of the Seagrass Cymodocea nodosa in a Mediterranean Semi-Estuarine Environment     

Marta  Pérez Javier  Romero 《Marine Ecology》1994,15(1):51-64

Abstract. Cymodocea nodosa is a relatively small seagrass species which is common in the Mediterranean. An intensive survey on its growth and production was carried out in a dense, monospecific stand located in a semi-estuarine embayment. Data on leaf appearance and growth, shoot recruitment and death, rhizome growth, above- and belowground biomass, and nutrient content in the different parts of the plant were obtained over 2 years. All these variables showed a clear seasonality. In general, maximum growth and production occurred in early summer (July), and maximum biomass was reached between July and September. Biomass, shoot density, growth and production showed clear minima in winter.  相似文献   

感潮河段潮流数值计算   总被引：1，自引：1，他引：1  

茅泽育马吉明  余云童蒋炳芳 裴文林 《海洋工程》2003,21(4):86-90

应用圣维南方程组、普赖斯曼隐格式及双扫描解法等提出了感潮河段洪潮遭遇的非恒定流数值计算模型，并对感潮河网中所常见的边界条件进行了分析研究。计算与实测结果比较表明，所采用的方法有效可行。  相似文献   

俄罗斯鲟鱼配合饲料主要营养指标的试验   总被引：2，自引：0，他引：2  

林茂苍 《台湾海峡》2001,20(Z1):123-126

用蛋白梯度及脂肪梯度进行工厂化养殖俄罗斯鲟鱼，经过78d养殖试验，认为适宜俄罗斯鲟的蛋白质含量为41％左右，脂肪含量为9％左右.  相似文献   

论盐、碱、镁的联产问题     

周仲怀  徐丽君  刘兴俊 《海洋科学》1992,16(5):64-68

从可能性和可行性两个方面论证了盐、碱、镁的联产问题。强调了利用莱州湾沿岸地下浓缩海水和饱和盐水的预处理方法以及白泥(盐泥)的综合利用问题,并着重指出了环境问题的重要性。最后提出了盐、碱、镁联产中应注意的几个问题。  相似文献   

带乘性噪声系统的多尺度最优滤波融合算法     

褚东升  赵爱美 《中国海洋大学学报(自然科学版)》2006,36(3):493-496,364

利用小波变换和多尺度分析的思想，将基于模型的动态系统分析和基于统计特性的多尺度信号变换方法相结合。提出了在线性最小方差意义下的带乘性噪声系统的多尺度最优滤波融合算法。并用计算机仿真说明了融合算法的有效性。  相似文献   

应用非平衡产量模型对卡塔尔渔业的分析   总被引：1，自引：1，他引：1  

刘群  任一平  王艳君  尤凯 《中国海洋大学学报(自然科学版)》2003,33(2):206-210

剩余产量模型是鱼类种群动力学的主要模型之一。本文应用 1个非平衡产量模型分析了卡塔尔渔业。结果表明当前鱼类生物量是最大持续产量时生物量的 1/4,当前捕捞死亡率是最大持续产量时捕捞死亡率的 2倍。经估算最大持续产量是 782 6t( 80 %置信区间为 6767～ 7993t) ,最佳捕捞努力量是 2 4 8艘船 ( 80 %置信区间为 2 2 5～ 2 86艘 )。  相似文献   

Fecundity and biomass of plaice (Pleuronectes platessa L.) in the northern Celtic Sea   总被引：1，自引：0，他引：1  

Horwood  J. W. 《ICES Journal of Marine Science》1993,50(3):315-323

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Seasonal and regional patterns in egg production of Calanus glacialis/marshallae in the Chukchi and Beaufort Seas during spring and summer, 2002     

Stphane Plourde  Robert G. Campbell  Carin J. Ashjian  Dean A. Stockwell 《Deep Sea Research Part II: Topical Studies in Oceanography》2005,52(24-26):3411

Understanding the physical and biogeochemical processes that control the exchange of biogenic carbon within and between the arctic shelves, slopes, and deep basins is a key objective of the Western Arctic Shelf-Basin Interaction program (SBI). Here, egg production (EP) of the dominant copepod Calanus glacialis/marshallae was used as an indicator of food limitation for the mesozooplankton community in the Chukchi and Beaufort Seas in spring and summer, 2002. Both C. glacialis and C. marshallae may occur in this region but the two cannot easily be differentiated visually. Four oceanographic regions were objectively identified that roughly corresponded to the different pathways in circulation of nutrient-rich Pacific water. A ‘transition’ region characterized by ‘older’ Pacific water was located at the shelfbreak and separated the nutrient-rich shelf water and the low-nutrient waters of the deep basin. The observed spatial pattern in EP in C. glacialis/marshallae in spring and summer resulted both from the different water mass environments and from the reproductive cycle of the species. EP was greater on the shelf than in the basin, corresponding to differences in body size and nitrogen condition factor (NCF) in females, while the egg viability was generally high throughout the study area. EP showed no relationship with low-chlorophyll a biomass under heavy ice-cover in spring, while a significant relationship was observed in the more open water in summer. Adult female carbon condition factor (CCF) was much higher in summer, reflecting the accumulation of lipids during the growth season. Small animals with a markedly greater NCF dominated on the shelf. The shelfbreak region contained a mixture of females from the shelf and the basin with intermediate sizes, conditions, and EP rates. The occurrence of water typical of the ‘transition’ shelfbreak region and elevated EP in C. glacialis/marshallae offshore on the Barrow Canyon and East Barrow sections indicated offshore transport of productive shelf water and the associated plankton community. The input of nutrient-rich Pacific water and accompanying elevated production to the northern Chukchi Sea and the Chukchi-Beaufort shelfbreak region may contribute to the reproductive success of C. glacialis/marshallae in this region.  相似文献   

福建闽江口潮间带大型底栖动物次级生产力时空特征     

周细平  吴培芳  李贞  吴茜  陈逸欣  刘康格  刘东艳  王玉珏  王跃启 《海洋通报》2020,39(3):342-350

为研究福建省闽江口潮间带大型底栖动物次级生产力的时空变化,于2014年11月—2015年8月对闽江口大型底栖动物进行了4个季度的调查研究。在获得3条断面大型底栖动物物种数、密度和生物量的基础上,利用Brey经验公式计算年平均次级生产力(P)。研究结果显示:闽江口4个季度共获得大型底栖动物63种,其中优势类群为多毛类。闽江口潮间带大型底栖动物年均次级生产力为6.13 g (AFDW)·m-2·a-1(AFDW,去灰分干重,ash-free dry weight)。在季节分布上,次级生产力最高值出现在夏季,为11.04 g (AFDW)·m-2·a-1,最低值出现在冬季,为2.25 g (AFDW)·m-2·a-1;在空间分布上,次级生产力最高值出现在P03断面,为10.23 g (AFDW)·m-2·a-1,最低值出现在P01断面,为2.54 g (AFDW)·m-2·a-1。大型底栖动物年均P/B值(B=Biomass,生物量)为2.31 a-1,最高值出现在春季,为3.17 a-1,最低值出现在夏季,为1.74 a-1;且P02断面的P/B值高于其他2条断面。Pearson相关分析结果表明,次级生产力与温度呈显著正相关,P/B值与盐度呈显著正相关但与p H呈显著负相关。因此,环境因子在一定程度上影响着该区域大型底栖动物的次级生产力。闽江口大型底栖动物群落组成中以个体小、生活史短、繁殖快的小型甲壳类蜾蠃蜚(Corophium sp.)为主,使该潮间带区域的P/B值高于其他临近潮间带区域的调查结果。  相似文献