首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2130篇
  免费   188篇
  国内免费   57篇
安全科学   127篇
废物处理   27篇
环保管理   936篇
综合类   540篇
基础理论   293篇
环境理论   44篇
污染及防治   50篇
评价与监测   48篇
社会与环境   232篇
灾害及防治   78篇
  2024年   8篇
  2023年   38篇
  2022年   25篇
  2021年   59篇
  2020年   70篇
  2019年   103篇
  2018年   79篇
  2017年   159篇
  2016年   126篇
  2015年   94篇
  2014年   81篇
  2013年   128篇
  2012年   113篇
  2011年   132篇
  2010年   73篇
  2009年   117篇
  2008年   87篇
  2007年   82篇
  2006年   85篇
  2005年   82篇
  2004年   58篇
  2003年   51篇
  2002年   70篇
  2001年   61篇
  2000年   56篇
  1999年   46篇
  1998年   31篇
  1997年   27篇
  1996年   26篇
  1995年   33篇
  1994年   18篇
  1993年   19篇
  1992年   13篇
  1991年   8篇
  1990年   14篇
  1989年   10篇
  1988年   7篇
  1987年   7篇
  1986年   9篇
  1985年   18篇
  1984年   8篇
  1983年   9篇
  1982年   6篇
  1981年   5篇
  1979年   4篇
  1978年   4篇
  1977年   5篇
  1973年   2篇
  1972年   2篇
  1971年   3篇
排序方式: 共有2375条查询结果,搜索用时 171 毫秒
961.
识别能源结构调整对CO2排放的定量影响可以为评估国家相关温室气体控制政策提供数理工具。首先基于中国的实际能源结构,对不同能源的标准煤CO2排放系数进行了测算和适用范围界定,在此基础上,定量分析了中国"十一五"期间能源结构调整对CO2排放的影响,指出了中国节能措施和能源结构调整措施对CO2排放影响的贡献率。通过对能源结构调整与CO2排放的敏感性定量测算,可知非化石能源替代煤炭具有最佳的CO2排放降低效益。在定量分析基础上,提出了基于能源结构的降低CO2排放的针对性措施和政策建议。  相似文献   
962.
Europe is a region of relatively high population density and productive agriculture subject to substantial government intervention under the Common Agricultural Policy (CAP). Many habitats and species of high conservation interest have been created by the maintenance of agricultural practices over long periods. These practices are often no longer profitable, and nature conservation initiatives require government support to cover the cost for them to be continued. The CAP has been reformed both to reduce production of agricultural commodities at costs in excess of world prices and to establish incentives for landholders to adopt voluntary conservation measures. A separate nature conservation policy has established an extensive series of protected sites (Natura 2000) that has, as yet, failed to halt the loss of biodiversity. Additional broader scale approaches have been advocated for conservation in the wider landscape matrix, including the alignment of agricultural and nature conservation policies, which remains a challenge. Possibilities for alignment include further shifting of funds from general support for farmers toward targeted payments for biodiversity goals at larger scales and adoption of an ecosystem approach. The European response to the competing demands for land resources may offer lessons globally as demands on rural land increase.  相似文献   
963.
The ecosystem approach—as endorsed by the Convention on Biological Diversity (CDB) in 2000—is a strategy for holistic, sustainable, and equitable natural resource management, to be implemented via the 12 Malawi Principles. These principles describe the need to manage nature in terms of dynamic ecosystems, while fully engaging with local peoples. It is an ambitious concept. Today, the term is common throughout the research and policy literature on environmental management. However, multiple meanings have been attached to the term, resulting in confusion. We reviewed references to the ecosystem approach from 1957 to 2012 and identified 3 primary uses: as an alternative to ecosystem management or ecosystem‐based management; in reference to an integrated and equitable approach to resource management as per the CBD; and as a term signifying a focus on understanding and valuing ecosystem services. Although uses of this term and its variants may overlap in meaning, typically, they do not entirely reflect the ethos of the ecosystem approach as defined by the CBD. For example, there is presently an increasing emphasis on ecosystem services, but focusing on these alone does not promote decentralization of management or use of all forms of knowledge, both of which are integral to the CBD's concept. We highlight that the Malawi Principles are at risk of being forgotten. To better understand these principles, more effort to implement them is required. Such efforts should be evaluated, ideally with comparative approaches, before allowing the CBD's concept of holistic and socially engaged management to be abandoned or superseded. It is possible that attempts to implement all 12 principles together will face many challenges, but they may also offer a unique way to promote holistic and equitable governance of natural resources. Therefore, we believe that the CBD's concept of the ecosystem approach demands more attention. La Necesidad de Desenredar Conceptos Clave del Argot Ambiente‐Estrategia  相似文献   
964.
本文对长江流域旅游资源的特点和开发条件进行了评价,同时论述了浦东开发对其的影响,提出了策应浦东开发的措施选择。  相似文献   
965.
966.
我国造纸业发展循环经济构想   总被引:7,自引:0,他引:7  
本文阐述了造纸业循环经济的内涵,分析了影响造纸业循环经济的各种因素,在此基础上。提出了实现造纸业循环经济的途径:优化原料和产品结构,建立废纸回收体系;实施企业规模化,加快技术开发和装备更新,加大治污力度;推行清洁生产和绿色管理,加强企韭和社会生态文化教育以及建立与之相适应的绿色政策保障体系。  相似文献   
967.
根据三峡工程建设中需要耗费大量木材的事实,结合三峡库区自然资源实际,着重探讨了开发新型竹胶台板代替木质模板,支援三峡工程建设,同时带动库区发展竹木种植及竹材深加工业,具体落实开发性移民方针的思路和对策。  相似文献   
968.
ABSTRACT: Federal planners, in proposing the massive main stem Missouri River water developments in Montana and North Dakota, promised economic and social benefits to the local residents. Five main stem dams, Fort Peck, Garrison, Oahe, Big Bend and Fort Randall, were evaluated for community and rural development effectiveness. Thirty-seven development factors were examined and improvements noted. Only small differences were noted between areas with water developments and the control area. Further analysis revealed that water development benefits moved downstream and to existing urban areas. The Missouri River's rural areas and small communities were not developed significantly by the water projects. Several problems associated with water development policy were illustrated by the study. Cultural differences between planners and the population impacted were ignored. Second, the allocation of social costs was not considered and related to this, serious geographic maldistribution of benefits and costs resulted. The differences between pre-development promises and development performance was dramatic. While the large dams remain as landmarks to engineering prowess, the projects need to be evaluated for their success in meeting humanistic development objectives. Major redevelopment may be warranted by such an ex-post evaluation.  相似文献   
969.
战略环境影响评价及其在我国实施的必要性   总被引:10,自引:0,他引:10  
本文简要介绍了战略环境影响评价(SEA)的产生,涵义,特点及研究现状,分析了当前我国环境影响评价存在的主要问题,重点论述了SEA在我国实施的必要性,阐明了SEA是实现可持续发展和改善我国环境评价质量的重要手段。  相似文献   
970.
环境决策支持系统研究进展   总被引:3,自引:1,他引:3  
叙述了环境决策支持系统(Environment Decision Support System-EDSS)的概念。通过对EDSS专著及实际应用于水质规划与管理。大气环境质量管理,环境影响评价等决策支持系统的介绍和评价,阐明了国我在EDSS领域的研究进展和我国在这一领域的研究成果。最后对EDSS的研究提出了若干建议。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号