虾蟹类亲体生殖营养需求研究的进展   总被引：10，自引：0，他引：10  

艾春香  李少菁  王桂忠  林琼武 《台湾海峡》2003,22(2):254-261

本文综述了虾蟹类生殖营养的最新研究成果,并讨论了各营养素对虾蟹类亲体成熟、生殖和幼体质量的影响．此外,就今后在虾蟹类亲体生殖营养方面开展深入研究提出了一些建议。  相似文献   

琼州海峡岸礁潮间带生物   总被引：14，自引：0，他引：14  

王丽荣  陈锐球  赵焕庭 《台湾海峡》2003,22(3):286-294

本文记录了2000年7月琼州海峡西口雷州半岛灯楼角珊瑚岸礁调查采集的25种造礁石珊瑚，以及栖息于湖间带的7类39科88种底栖生物，其大多数种类属于印度-西太平洋热带区系。优势类群是软体动物和节肢动物。珊瑚礁段底栖生物的平均生物量、栖息密度和多样性值分别为1173．30g／m^2，790．0个／m^2和5．69，由于造礁石珊瑚的存在为其他底栖生物提供了良好的生态环境，从而丰富了本区底栖生物的种类组成、数量、分布和群落结构。  相似文献   

营养盐水平对四种海洋浮游硅藻胞外多糖产量的影响   总被引：10，自引：0，他引：10  

王大志  黄世玉  程兆第 《台湾海峡》2003,22(4):487-492

4种海洋浮游硅藻(牟勒氏角毛藻、海链藻、三角褐指藻和新月菱形藻)培养在改进的f／2培养基中，研究了不同氮、磷和硅营养水平对它们胞外多糖产量的影响．结果表明，硅藻胞外多糖的生产和释放具有种间特异性，角毛藻和海链藻胞外多糖的生产和释放主要在静止期，而三角褐指藻和新月菱形藻在指数生长期前期和静止期都能生产和分泌较高的胞外多糖；培养液中低浓度磷减少了4种硅藻在静止期胞外多糖的产量，但增加了角毛藻在生长期前期胞外多糖的产量；氮浓度的降低增加了三角褐指藻在指数生长前期胞外多糖的产量，但减少了其他3种藻类胞外多糖的产量；硅浓度的降低对4种硅藻胞外多糖的产量影响不大，在一定程度上还促进了静止期胞外多糖的生产．本研究表明，营养盐水平对硅藻胞外多糖生产的影响因种类和细胞所处生长期不同而存在着很大的差异．  相似文献   

近海污损生物的调查方法     

严文侠  董钰  王华接  严岩  严涛  梁冠和 《热带海洋学报》1994,(4)

近海海区污损生物调查有浮标挂板法和海上设施（浮标及其锚碇系统，Ｍａｒｅｘ水文浮标，移动式钻井平台和固定式生产平台）采样法。由于近海海区污损生物调查工作的特殊性和艰难性，笔者提出了利用已有的海上设施，尤其是固定式平台来积累近海污损生物资料，以便进行生态学研究。  相似文献   

SYF1-1型海洋金属防腐装置     

杨立  王孟馨 《海洋技术学报》2003,22(2):84-86

SYFl—1型海洋金属防腐装置是一种用于潮汐发电设备、海洋石油平台、输送海水管道、船舶等海洋金属防腐的装置。文中对该装置的工作原理、组成、主要技术性能、特点以及实现方法作了概要描述。  相似文献   

Patterns and controls of surface sediment distribution: west-central Florida inner shelf   总被引：2，自引：0，他引：2  

Gregg R. Brooks  Larry J. Doyle  Richard A. Davis  Nancy T. DeWitt  Beau C. Suthard   《Marine Geology》2003,200(1-4):307-324

The west-central Florida inner shelf represents a transition between the quartz-dominated barrier-island system and the carbonate-dominated mid-outer shelf. Surface sediments exhibit a complex distribution pattern that can be attributed to multiple sediment sources and the ineffectiveness of physical processes for large-scale sediment redistribution. The west Florida shelf is the submerged extension of the Florida carbonate platform, consisting of a limestone karst surface veneered with a thin unconsolidated sediment cover. A total of 498 surface sediment samples were collected on the inner shelf and analyzed for texture and composition. Results show that sediment consists of a combination of fine quartz sand and coarse, biogenic carbonate sand and gravel, with variable but subordinate amounts of black, phosphorite-rich sand. The carbonate component consists primarily of molluskan fragments. The distribution is patchy and discontinuous with no discernible pattern, and the transition between sediment types is generally abrupt. Quartz-rich sediment dominates the inner 15 km north of the entrance into Tampa Bay, but south of the Bay is common only along the inner 3 km. Elsewhere, carbonate-rich sediment is the predominate sediment type, except where there is little sediment cover, in which cases black, phosphorite-rich sand dominates. Sediment sources are likely within, or around the periphery of the basin. Fine quartz sand is likely reworked from coastal units deposited during Pleistocene sea-level high stands. Carbonate sand and gravel is produced by marine organisms within the depositional basin. The black, phosphorite-rich sand likely originates from the bioerosion and reworking of the underlying strata that irregularly crop out within the study area. The distribution pattern contains elements of both storm- and tide-dominated siliciclastic shelves, but it is dictated primarily by the sediment source, similar to some carbonate systems. Other systems with similar sediment attributes include cool-water carbonate, sediment-starved, and mixed carbonate/siliciclastic systems. This study suggests a possible genetic link among the three systems.  相似文献   

声波对海洋生物的影响与作用的研究     

周时强  王清池  李文权  许鹭芬  杨海华 《海洋技术学报》2001,20(2):9-11

本文研究了声波对某些海洋生物的影响与作用。实验表明，适当的声波剂量对海洋生物的作用所产生的声学生物效应是积极的，可促使生物体向有利的方向产生变异，而强度过大的声波对海洋生物有效伤甚至致死的效应。  相似文献   

Main Controlling Factors on Hydrocarbon Accumulation and Distribution in Marine Sedimentary Sequences in South China     

蔡立国  周雁  白振瑞 《中国地质大学学报(英文版)》2008,19(6):645-655

Multiple source rock assemblages were deposited in the sedimentary provinces in South China in geologic history,and some of them were destructed by and some survived against multiple tectonic movements.Therefore,multiple sources,mixed sources,and uneven distribution of sources occurred in the marine sedimentary basins in South China during the late stage of hydrocarbon pooling.Epidiagenesis of the marine carbonate reservoirs and its modification to reservoir poroperm characteristics determined the formation and the scale of natural gas pools.The exploration practices show that the large to medium gas fields mainly occur in areas with high-quality reservoirs.Detailed study of the paleo-oil accumulations and typical oil and gas reservoirs reveals that the basins experienced multiphase superimposition and modification,leading to the distribution of the Paleozoic paleo-oil accumulations and bitumen in the peripheral areas.The phenomenon that oil and gas production concentrates in the Sichuan basin indicates that the overall sealing conditions of a basin determine the oil/gas potentials and the scale of oil and gas production.This is a critical factor controlling the accumulation and distribution of gas in the marine sequences in South China.The early oil and gas pools in the Yangtze platform left billions of bitumen in the peripheral areas due to the destruction of seals.Since the Himalayan,"late-generation and late-accumulation" gas pools represented by the gas pools in the Sichuan (四川) basin were formed in the marine sedimentary sequences in South China as a result of the change of the sealing conditions.Current gas discoveries appear to be "paleo-generation and paleo-accumulation" gas pools but actually are "late-generation and late-accumulation" gas pools.These patterns of hydrocarbon pooling clearly depict themselves in western Sichuan basin and Weiyuan (威远)gas field.It is revealed that the gas pools in the Sichuan basin were mainly formed as a result of hydrocarbon phase change (thermal cracking of oil to gas),miscible migration,and dynamic equilibration since the Himalayan.A large number of gas pools were formed in the Himalayan and the gas pools in the marine sequences are characterized by late pooling; this kind of gas fields/pools are controlled by:(1) effectiveness of modification and superimposition of the marine basins,(2) effectiveness of the source rocks,(3) effectiveness of the overall preservation conditions,and (4) effectiveness of plays.  相似文献   

一种面向网络发布的海洋数据库引擎(英文)   总被引：1，自引：0，他引：1  

Zhirong Chen  Caijiang Xu 《地球空间信息科学学报》2008,11(4):252-256

To meet the requirements of efficient management and web publishing for marine remote sensing data, a spatial database engine, named MRSSDE, is designed independently. The logical model, physical model, and optimization method of MRSSDE are discussed in detail. Compared to the ArcSDE, which is the leading product of Spatial Database Engine, the MRSSDE proved to be more effective.  相似文献   

Seasonal variations of atmospheric sulfur dioxide and dimethylsulfide concentrations at Amsterdam Island in the southern Indian Ocean     

J. P. Putaud  N. Mihalopoulos  B. C. Nguyen  J. M. Campin  S. Belviso 《Journal of Atmospheric Chemistry》1992,15(2):117-131

Daily measurements of atmospheric sulfur dioxide (SO₂) concentrations were performed from March 1989 to January 1991 at Amsterdam Island (37°50 S–77°30 E), a remote site located in the southern Indian Ocean. Long-range transport of continental air masses was studied using Radon (²²²Rn) as continental tracer. Average monthly SO₂ concentrations range from less than 0.2 to 3.9 nmol m^-3 (annual average = 0.7 nmol m^-3) and present a seasonal cycle with a minimum in winter and a maximum in summer, similar to that described for atmospheric DMS concentrations measured during the same period. Clear diel correlation between atmospheric DMS and SO₂ concentrations is also observed during summer. A photochemical box model using measured atmospheric DMS concentrations as input data reproduces the seasonal variations in the measured atmospheric SO₂ concentrations within ±30%. Comparing between computed and measured SO₂ concentrations allowed us to estimate a yield of SO₂ from DMS oxidation of about 70%.  相似文献