基于沉积物污染风险与生态系统服务价值的环境管理优先级初步研究——以渤海为例

不同海域所面对的污染风险及各自生态系统服务价值均不相同,因而在环保资金有限的情况下,应制定更有针对性的管理优先级和环境保护策略。文中以我国渤海为例,分别对渤海内各不同海湾的污染风险和海洋生态系统服务价值进行了评估。研究结果表明,辽东湾的管理优先级最高,其余依次是莱州湾和渤海湾。在此基础上,提出了针对不同海湾特点的管理策略。文中提出的方法和思路对于如何有效制定海洋环境保护策略具有重要的应用价值和借鉴意义。     

海洋生态系统服务价值化研究

归纳了海洋生态系统及其服务功能的概念内涵,针对近海生态系统提供的功能进行了讨论。总结了关于海洋生态系统服务的价值评价方法并对其进行分类汇总,按照千年生态系统评估报告的分类标准,将生态系统功能分成四大类,分别为:供给功能、调节功能、文化功能和支持功能,在此基础上得出海洋生态系统综合评价的指标并将各类生态系统价值化,为以后的海洋生态价值评估工作提供科学依据和数据支持。     

加拿大海洋环境管理

加拿大是世界上最早进行海洋综合立法的国家,也是最早制定国家行动计划来保护海洋环境陆源活动污染的国家。在联邦环境保护法和海洋法的基础上,形成了联邦和地方政府密切合作的海洋环境保护规制与政策实施体系,以海洋可持续发展为目标,预防性方法为原则,协调联邦与地方政府的管理职责,通过＂海洋环境质量＂计划与海洋保护区网络发展计划,实现海洋资源开发与海洋环境保护的协调发展。     

加拿大海洋环境管理

加拿大是世界上最早进行海洋综合立法的国家,也是最早制定国家行动计划来保护海洋环境陆源活动污染的国家.在联邦环境保护法和海洋法的基础上,形成了联邦和地方政府密切合作的海洋环境保护规制与政策实施体系,以海洋可持续发展为目标,预防性方法为原则,协调联邦与地方政府的管理职责,通过"海洋环境质量"计划与海洋保护区网络发展计划,实现海洋资源开发与海洋环境保护的协调发展.     

基于生态系统的挪威海海洋环境综合管理计划

为推动我国国土空间规划新视角下的海洋空间规划实践,提升我国海洋综合管理水平,文章概述基于生态系统的挪威海海洋环境综合管理计划的主要内容,并重点分析挪威海的海洋环境空间管理措施。研究结果表明:挪威海海洋环境综合管理计划是基于生态系统的海洋空间规划,建立在良好的海洋环境状况和海洋生物多样性与其栖息地的保护基础之上,以可持续利用海洋资源来实现海洋产业的价值创造与生态系统服务供给;该管理计划制定一系列海洋环境保护措施和人类活动空间管理措施,以实现挪威海海洋环境的有效保护和海洋经济产业的有效管理;挪威海海洋空间规划的发展可为我国国土空间规划涉海内容的编制、海洋资源的可持续利用与海洋产业的快速健康发展提供重要参考。     

区域海洋生态系统服务功能价值及其贡献率

本文以大连市为例,将大连市的城市生态系统划分为绿地、城市"黄色"用地和海洋3大类,并对其服务功能价值及其贡献率进行研究。结果显示:2003年大连市海洋生态系统服务功能价值达2366.17亿元,贡献率为94.40%,说明大连市海洋生态系统的服务功能价值最大。     

广东省海洋生态环境质量评价与保护措施研究

文章着重构建了广东省海洋生态环境质量评价的指标体系和模糊综合评价模型,提出评价标准,指出制约因子,并从污染源头控制、综合整治、执法监管和公民环境保护意识等４个方面提出了一系列广东省海洋生态环境保护的措施和建议,以期为决策层提供参考依据。     

天津疏浚物海洋倾倒区海水水质现状评价

采用单因子指数法及模糊综合评价方法对2011年天津疏浚物海洋倾倒区的水质数据进行评价,得出结论:天津疏浚物海洋倾倒区水质总体符合第一类海水水质标准,Pb、石油类为该海域主要污染物,倾倒区各污染物指标满足天津市海洋环境保护规划对倾倒区水质的相关规定。通过比较发现:单因子指数法适用于对单个污染因子的污染程度进行统计,模糊综合评价法则适用于对整体监测结果进行评价。     

基于海洋环境保护视角的海洋功能区划评价问题研

海洋功能区划是加强海域使用和海洋环境保护而采取的一种管理手段,但在海洋开发过程中其海洋环境保护作用正不断弱化。文章深入分析海洋功能区划与海洋环境保护之间的关系,并从海洋环境保护视角出发剖析目前海洋功能区划存在的不足,提出科学划分区划的海洋开发与保护格局、加强区划对海域开发利用方式的转变、实施分类分区的海域生态系统等建议,以强化海洋功能区划的海洋环境保护作用。     

以生态系统为基础的海洋管理模式引发的思考

从介绍以生态系统为基础的海洋管理模式的概念及由来出发,浅谈了对海洋环境保护的生态伦理观、海洋生态系统单行法及尊重海洋生态系统制定海洋环境保护管理体制的看法.     

Microbial Biomass and Organic Nutrients in the Deep-Sea Sediments of the Central Indian Ocean Basin

In order to assess the impact of deep-sea mining on the in situ benthic life, we measured the microbial standing stock and concentration of organic nutrients in the deep-sea sediments of the Central Indian Ocean Basin in the Indian pioneer area. Sediments were collected using box core and grab samples during September 1996. The total bacterial numbers ranged from 10 10 -10 11 cells per g -1 dry weight sediment. There was a marginal decrease in the number of bacteria from surface to 30 cm depth, though the subsurface section registered a higher number than did the surface. The highest numbers were encountered at depths of 4-8 cm. The retrievable number of bacteria were two orders less in comparison with the direct total counts of bacteria. An almost homogeneous distribution of bacteria, total organic carbon, living biomass, and lipids throughout the depth of cores indicates active microbial and benthic processes in the deep sea sediments. On the other hand, a uniform distribution of total counts of bacteria, carbohydrates, and total organic carbon in all the cores indicates their stable nature and suggests that they can serve as useful parameters for long-term monitoring of the area after the benthic disturbance. Further studies on temporal variability in this region would not only verify the observed norms of distribution of these variables but would also help to understand restabilization processes after the simulated benthic disturbance.     

海上大直径钢管桩打桩过程中桩周土强度弱化研究

海上大直径钢管桩打桩过程中,桩周土体受到强烈扰动而发生强度弱化,掌握桩周土体强度弱化规律对于准确预测打桩过程、保证工程安全具有重要意义。为研究土体强度弱化规律,开展了环剪试验模拟打桩对桩周土体的扰动,测试土体强度随剪切速率的变化规律,建立了描述土体强度弱化规律的拟合公式,引入到打桩分析软件中。研究结果表明：土体的强度折减程度不仅与土体本身的性质有关还受到土体的埋深和剪切速率的影响,埋深越深土体强度折减程度越低,剪切速率越高土体强度折减越高,在打桩分析中可采用这里推荐的线性折减方法来模拟不同深度处土体强度的折减规律。     

Geoacoustic Inversion via Genetic Algorithm and Its Application to Manganese Sediment Identification

An acoustic inversion method using a wide-band signal and two near field receivers is proposed and applied to multiple layered seabed models including a manganese sediment. The inversion problem can be formulated into a probabilistic model comprised of signals, a forward model, and additive noise. The forward model simulates wide-band signals, such as chirp signals, and is chosen to be the source-waveletconvolution plane wave modeling method. The wavelet matching technique, using weighted least-squares fitting, estimates the sediment sound-speed and thickness on which determination of the possible numerical ranges for a priori uniform distribution is based. The genetic algorithm is applied to a global optimization problem to find a maximum a posteriori solution for determined a priori search space. Here the object function is defined by an L 2 norm of the difference between measured and modeled signals. Not only the marginal pdf but also its statistics are calculated by numerical evaluation of integrals using the samples selected during importance sampling process of the genetic algorithm.     

Phylogenetic diversity and phenotypic characterization of cultivable bacterioplankton isolated from polar oceans

A set of 27 marine planktonic bacteria isolated from the polar regions was characterized by 16S rDNA sequencing and physiological and biochemical testing. More than half of these bacteria were positive for caseinase, gelatinase and 13-glucosidase, and could utilize glucose, maltose or malic acid as carbon source for cell growth. Twelve isolates expressed nitrate reduction activities. Except for one antarctic isolate BSwlO175 belonging to Actinobacteria phylum, these isolates were classified as γ-Proteobacteria, suggesting that γ-Proteobacteria dominated in cultivable marine bacterioplankton at both poles. Genus Pseudoalteromonas was the predominant group in the Chukchi Sea and the Bering Sea, and genus ShewaneUa dominated in cultivable bacterioplankton in the Prydz Bay. With sequence similarities above 97%, genus Psychrobacter was found at both poles. These 27 isolates were psychrotolerant, and significant 16S rDNA sequence similarities were found not only between arctic and antarctic marine bacteria （ 〉 99% ）, but also between polar marine bacteria and bacteria from other aquatic environments （ ≥ 98.8% ）, including temperate ocean, deep sea, pond and lake, suggesting that in the polar oceans less temperature-sensitive bacteria may be cosmopolitan and have a bipolar, even global, distribution at the species level.     

Deep-Sea Sediment Compression Curves: Some Controlling Factors, Spurious Overconsolidation, Predictions, and Geophysical Reproduction

Oedometer tests have been carried out on 70 undisturbed surficial clays (at approximately 250 mm below the mudline), mostly collected by free-fall corers from sites widely scattered throughout the deep-sea North Atlantic. Acoustic measurements were also made, initially on contiguous samples and ultimately on the same sample using a geophysically instrumented oedometer which also collected electrical resistivity data. Apart from those quiescent areas below the carbonate compensation depth, such as north of the West Indies where very fine clays exist, most of the samples are silty clays whose geotechnical-geophysical properties are dependent on the type of clay minerals present (and their ability to take in moisture), the sand-size fraction, and the quantity of carbonate present. Thus the pure clays have high compressibilities which decrease on the addition of coarse particles, while the converse is true for the acoustic parameters, these increasing with the sand fraction. Using the notion of the intrinsic compression line for all samples, and comparison to it of the measured compression curves, it is clear that, contrary to some previously held ideas, most deep-sea clays are normally consolidated; the addition of carbonate has the effect of creating an open, stronger sediment skeleton. Interestingly, where information is available, the variation with depth of a sample's acoustic velocity follows the void ratio pressure relationship of the compression curve. This allows the construction of an in-situ sediment compression curve using the in-situ geophysical observations.     

INFORMATION FOR AUTHORS

<正>Acta Oceanologica Sinica(AOS)is a comprehensive academic journal edited by the Editorial Committee of Acta Oceanologica Sinica and is designed to provide a forum for important research papers of the marine scientific community which reflect the information on a worldwide basis.The journal publishes scholarly papers on marine science and technology,including physics,chemistry,biology,     

Estimation of Sediment Properties during Benthic Impact Experiments

Sediment properties, such as water content and density, have been used to estimate the dry and wet weights, as well as the volume of sediment recovered and discharged, during benthic impact experiments conducted in the Pacific and Indian Oceans. The estimates show that the weights of dry (355-1332 t) and wet sediment (1651-4888 t) recovered during the experiments, are not only a function of the total duration and distance covered during the experiment, but also depend on water content and density of the sediment. Estimation of dry sediment and its volumetric ratio in the discharge, are key parameters for calculating the discharged volume. The estimated volume of wet sediment recovered (1427-4049 m 3 ) as well as discharged (2693-6951 m 3 ) during the experiments, provide important inputs to evaluate the sediment resettlement and migration. Using these estimates, the average depth of excavation on the seafloor, can also been calculated. However, the stages of sediment recovery and discharge are expressed differently in some of the experiments. In order to standardize these, different stages have been identified, and definitions of certain terms have been suggested, for use in the future. The methods of calculating different properties, as well as weight and volume of discharged sediment are described in the paper for use in other applications concerning deep-sea discharges.