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滨海湿地是滨海区域高质量发展的重要资源基础和生态安全屏障,是全面推进陆海统筹战略,构建陆海命运共同体的重要依托。理论和实践表明:受损滨海湿地修复需要同毗邻未受损自然湿地协同优化,以提升滨海湿地综合生态功能,强化滨海区域生态安全屏障,并提升气候变化背景下滨海湿地应对海平面上升的长期适应性,减缓自然-人为双向“海岸挤压”效应下滨海湿地的退化消失。据此,文章提出了构建应对围垦开发和适应海平面上升情形下“三线整合”中国滨海湿地生态安全格局相关概念,包括:抢救性保护生态红线区,优先开展湿地修复的生态修复绿线区,以及适应气候变化影响下海平面上升的生态预留蓝线区。“三线整合”生态安全格局强调应将湿地修复纳入区域生态系统格局与功能协同优化过程,是对以往局限于小尺度、孤立的湿地修复格局的反思,也是将湿地修复提升到区域生态安全层面的理论与实践探索。在剖析相关概念的基础上,文章针对我国滨海湿地保护修复、海岸带管理和国土空间开发提出了相关对策和建议。 相似文献
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银川市湿地是银川重要的城市生态资源,不但是市区人民活动频繁密集的区域,而且是自然生态过程的密集地区。保护和合理利用银川湿地资源。对改善生态和人居环境,实现人与自然和谐发展,具有十分重要的意义。分析了银川湿地的现状,并且就现状提出了保护措施。 相似文献
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盘锦湿地具有面积大、类型多、生物多样性丰富、生态价值高的特征,在调节区域自然生态环境质量和推进区域经济社会发展中发挥着重要作用。通过对盘锦湿地生态环境基本概况的阐述,全面分析了影响盘锦湿地保护和恢复因素,提出了科学保护盘锦湿地资源的对策和建议。 相似文献
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湿地是自然界重要的自然资源类型之一。保护湿地资源、维持湿地基本生态过程,对改善区域生态环境和保障社会经济持续发展具有重大意义。本文从湿地资源研究角度,通过查阅近20年来相关资料和文献分析,系统揭示了我国湿地资源研究特点与学科特征,并通过与国际湿地研究相比较,阐明我国未来湿地研究发展重点与趋势。得出基本结论:①我国湿地资源研究具有区域性、多样性、综合性和国际性特点;②从自然资源研究的学科特点来看,我国湿地研究重点领域逐渐由湿地资源调查、资源与地理研究向资源与生态、资源与环境以及技术方法应用等方面发展;③我国未来湿地资源研究具有研究区域不断扩大、空间尺度两级分化明显的特征,研究内容上表现为湿地与全球气候变化研究将成为新的热点与重点,研究方法不断由静态向动态过程、定性向定量以及机理性模型与新技术方法应用方向发展。 相似文献
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干旱区绿洲湿地生态系统研究的意义和重点 总被引：2，自引：0，他引：2
梅荣 《内蒙古科技与经济》2007,(9)
本文在具体分析干旱区绿洲生态系统和湿地生态系统特点、现状以及它们所面临的各种生态问题的基础上,提出干旱区绿洲湿地研究的必要性,可行性.具体分析了绿洲区湿地生态系统研究的意义,从绿洲湿地特征研究、湿地动态变化、驱动因子、绿洲典型湿地类型的研究、绿洲湿地保护与PRED可持续发展研究、绿洲退化湿地生态系统的恢复重建研究等几方面简要分析了绿洲湿地研究重点. 相似文献
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湖荡湿地是太湖流域生态系统的重要组成部分,是"一湖四圈"中的一个重要圈层,是低污染水强化净化的重要水域,也是河-湖水系联接的关键节点,更是河网区水资源保护和水生态修复重心.
针对湖荡湿地面积锐减、水质恶化、生态系统衰退、污染物拦截与净化能力下降的现状,"十二五"国家水体污染控制与治理科技重大专项"湖荡湿地重建与生态修复技术及工程示范"(2012ZX07101-007),经过多年的研究和工程实践,研究形成了太湖流域湖荡湿地生态修复总体方案,研发集成了河湖相联复杂水系湖荡湿地重建与生态修复的成套技术和城市景观湖泊西湖水质改善与生态修复成套技术,并以滆湖和西湖为典型区域开展了工程示范,推进了太湖流域湖荡湿地的水质改善与生态修复. 相似文献
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湿地是人类社会赖以生存和发展的重要生态资源,被称为是"地球之肾"。伴随着我国城市化进程的不断发展与加速,当前城市湿地的生态安全以及自然格局都收到了严重的威胁,武汉是华中地区最大的城市,市区内湿地资源较为丰富,而地处汉口江滩与白沙洲的河漫滩又是具有代表性的湿地。本文以该区域湿地为研究对象,以城市湿地的景观设计与保护作为切入点,探讨城市湿地独特的景观价值和作用,结合景观设计的相关原理和理论,探索城市湿地景观保护的设计原则与方法。 相似文献
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黄河三角洲是国际重要水鸟停歇地,由于受自然因素和人类活动的影响,该地区水鸟栖息地面积不断减少,生物多样性不断降低。通过引用淡水对栖息地进行恢复,能大大提高水鸟的生境质量,增加水鸟的多样性。然而该地区淡水资源短缺,农业、工业和生活用水量大,生态用水量严重不足,如何因地制宜地利用淡水、海水和废水资源,发挥湿地保护生物多样性及净化环境的功能成为水鸟栖息地恢复的关键问题。本文总结了黄河三角洲的水鸟多样性及其生境需求,归纳了水资源的应用现状。在淡水资源短缺情况下,使用淡水、海水和废水3种不同水源补给湿地时,水鸟及其栖息地的特征和面临的挑战。结合水鸟迁徙、黄河来水的时间特征、水鸟栖息地斑块尺度和区域尺度需求特征、不同水源的用水现状、恢复效果及空间分布特征等要素,提出了综合利用海水、淡水和废水对区域和斑块尺度的生境类型进行配置的生态补水恢复模式,建议斑块尺度重点考虑水深及水面植被比例,区域尺度重点考虑水资源分布及自然和人工不同类型湿地的空间优化配置,最后从多样性维持以及不同水资源综合有效利用方面提出了未来研究展望。本文结果旨在为黄河三角洲湿地恢复和水鸟生物多样性提高提供科学依据。 相似文献
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中国湿地资源及其保护研究 总被引：40，自引：2，他引：38
中国湿地类型多,包括《湿地公约》列出的全部湿地类型。另外还包括青藏高原湿地,共计38种。湿地面积大,据最新统计,总面积约7 969 ×104 hm2 ,包括人工湿地3 447 ×104 hm2 ,自然湿地4 522 ×104 hm2 ,居世界第三位。湿地中蕴藏有丰富的生物资源、泥炭资源、水资源,而其本身又是重要的土地资源。湿地在调节环境,保持小气候稳定,维持区域生态平衡等方面发挥重要作用,对改善我国生态环境和保障社会经济发展具有重要意义。但随着经济的发展,湿地资源面临严重的威胁。湿地面积不断减少,湿地珍稀动植物种类、数量不断下降,湿地污染、破坏严重。湿地资源到了必须加以重视和保护的时候。本文在全面研究中国湿地资源现状基础上,分析了湿地面临的主要威胁,最后提出湿地保护及其对策。意在加强湿地资源的保护与合理利用,使得湿地资源得以永续利用,造福于后世。 相似文献
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A research group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol-a chemical found in the skins of red grapes in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said. 相似文献
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Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
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A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
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Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
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《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
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Active biological molecules functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery disease diagnosis therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction. 相似文献
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《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
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Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
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Leah A. Lievrouw 《The Information Society》2000,16(2):155-159
This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment. 相似文献
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Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献