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   1801篇
  免费   169篇
  国内免费   102篇
安全科学   113篇
废物处理   12篇
环保管理   543篇
综合类   525篇
基础理论   278篇
环境理论   54篇
污染及防治   20篇
评价与监测   96篇
社会与环境   302篇
灾害及防治   129篇
  2024年   3篇
  2023年   58篇
  2022年   42篇
  2021年   54篇
  2020年   70篇
  2019年   110篇
  2018年   109篇
  2017年   116篇
  2016年   109篇
  2015年   119篇
  2014年   61篇
  2013年   194篇
  2012年   111篇
  2011年   110篇
  2010年   90篇
  2009年   64篇
  2008年   64篇
  2007年   60篇
  2006年   73篇
  2005年   48篇
  2004年   61篇
  2003年   45篇
  2002年   37篇
  2001年   34篇
  2000年   62篇
  1999年   54篇
  1998年   17篇
  1997年   23篇
  1996年   11篇
  1995年   5篇
  1994年   6篇
  1993年   18篇
  1992年   3篇
  1991年   8篇
  1990年   9篇
  1989年   2篇
  1988年   1篇
  1987年   2篇
  1986年   2篇
  1984年   1篇
  1982年   2篇
  1981年   1篇
  1980年   1篇
  1977年   1篇
  1971年   1篇
排序方式: 共有2072条查询结果,搜索用时 15 毫秒
231.
Abstract:   Successful biodiversity management, including the selection and subsequent management of protected areas, depends in large measure on classifications showing land areas with similar ecosystem character. In contrast to widely used, qualitative land-classification techniques, we used a numerical classification of explicit spatial layers describing aspects of New Zealand's climate and landforms. We chose input variables for their strong functional links with major physiological processes of trees and high statistical correlations with geographic distributions of individual tree species as determined from previous studies. Higher-level divisions of the resulting classification were dominated by macroclimatic variation associated with change in both latitude and orographic protection provided by New Zealand's main mountain ranges, but variation in landform became more important at finer scales of classification. Classification units showed marked variation in the proportional extent of both indigenous vegetation cover and land set aside for conservation purposes. Indigenous ecosystem remnants of the highest priority for increased protection occurred in warm, lowland domains, particularly in drier environments, where both indigenous cover and protected areas are of minimal geographic extent. Such results underline the considerable potential of an environmental classification to provide a landscape context for systematic conservation management, particularly in environments where the natural ecosystem pattern has been severely modified by human activity.  相似文献   
232.
城市热岛效应研究进展   总被引:65,自引:8,他引:65  
彭少麟  周凯  叶有华  粟娟 《生态环境》2005,14(4):574-579
作为现代城市气候主要特征之一的城市热岛效应有日渐严重的趋势。文章综述了城市热岛的生态环境效应、热岛的主要形成机制、时空分布特征等研究状况和发展趋势;基于当前城市热岛研究的现状,提出了未来城市热岛效应研究的方向及缓解城市热岛效应的有关对策。  相似文献   
233.
气候变化对莱州湾地区水资源脆弱性的影响   总被引:9,自引:0,他引:9  
论文首先分析了在现状年(1993年)供水能力和需水条件下,1960~1993年的气候波动对莱州湾地区水资源供需平衡和脆弱性的影响。然后根据未来气候情景分析了在2000规划年和2020规划年供水能力和需水要求下,未来气候变化(2000~2042年)对水资源供需平衡及脆弱性的影响。在农业需水保证率50%时,2000~2019年水资源供需基本平衡,但2020~2042年水资源短缺20~57亿m3。若考虑未来气温的上升,则水资源短缺进一步加大。因此,2020年以后需在调入56亿m3客水资源基础上,从区外调入更多稳定的水量以保证该地区社会经济的可持续发展。  相似文献   
234.
In its Article 2, the U.N. Framework Convention on Climate Change policymakers gave themselves a long-term dynamic mandate under uncertainty. Taking the example of forestry activities in developing countries, the present article discusses whether land-based climate change mitigation measures in the context of compensation mechanisms for human-induced greenhouse gas emissions are covered under the UNFCCC's ultimate objective. Both the problem of climate change and human intervention act over long, yet finite timeframes. The article argues for taking a dynamic 100-year timeframe as reference for present-day activities. It concludes that increasing biotic carbon storage is legitimate for measures that contribute to biodiversity conservation, as long as it does not serve as a pretext for neglecting technological change. Among all forestry options, the list of priorities should be avoiding deforestation and devegetation, sustainable forest management, and afforestation. The problem of saturation can be encountered by the combination of forestry with the increased use of wood products and bioenergy. Concluding, the article gathers criteria for forest climate activities in the post-2012 regime. JEL Classification: Q23, Q54; Q57; Q58  相似文献   
235.
The broad objective of this special issue of Mitigation and Adaptation Strategies for Global Change is to address some of the gaps in our knowledge and understanding of the policies, programs, and measures that might be applied to natural hazards and their impacts in an era of climate change. Given the global impacts of climate change and world-wide pattern of increasing losses from natural hazards we necessarily adopt an international perspective. The specific goals of the special issue are to: (a) encompass experiential aspects, emphasizing current practice of mitigation and its associated measures, and their results; and (b) explore primary or root causes of alarming shifts in human and economic costs of environmental extremes. Special emphasis is placed on how human activities are playing a key role in enhancing vulnerability to NTEE (nature-triggered environmental extremes), quite independently from the anthropogenic causes of climate change. The goals are also (c) to examine costs, risks, and benefits (of all kinds including social, political, ecological) of mitigation, and adjustment and adaptation measures; and (d) analyze policy implications of alternative measures. These components are expected to make significant contributions to policy considerations – formulation, implementation and evaluation. There is much uncertainty about the rate of climate change; however, the fact of increase of the atmospheric temperature in the last century is no longer a subject of scientific or policy debate. Due to such changes in the geophysical parameters, certain types of nature-triggered environmental extreme events are likely to continue to increase. How global warming will affect regional climates and pertinent variables is not well known, limiting our ability to predict consequential effects. This factor poses serious constraints against any straightforward policy decisions. Research findings of the work of this volume reaffirm that human dimensions, specifically our awareness and decision-making behavior, are powerful explanatory factors of increasing disaster losses. Disaster mitigation through addressing human, social, and physical vulnerability is one of the best means for contributing to ‘climate change adaptation plans’, and sustainable development goals. Recent lessons from various countries have depicted that the formulation of mitigation strategies cannot be exclusively top-down as it requires social, political, and cultural acceptance and sense of ownership. An interactive, participatory process, involving local communities, produces best expected outcomes concerning mitigation, preparedness, and recovery. An emerging consensus is that there is a need to move towards the ‘mission’ of the International Strategy for Disaster Reduction which aims at building disaster resilient communities by promoting increased awareness of the importance of disaster reduction as an integral component of sustainable development, with the goal of reducing human, social, economic and environmental losses due to natural hazards and related technological and environmental disasters. Sharing of best practices and lessons globally is certain to produce more efficiency and understanding in policy and decision making.  相似文献   
236.
基于GIS的黄土高原地区植被与气候关系研究   总被引:6,自引:0,他引:6  
排序是植被与环境关系分析的重要手段。利用地理信息系统技术 (GIS)结合除趋势典范对应分析对黄土高原地区植被与气候关系进行了研究。结果清楚地反映了黄土高原地区植被与气候的地带性分布规律 ,证明GIS结合植被数量生态分析方法在黄土高原植被与环境关系的研究中是有效的  相似文献   
237.
ABSTRACT

Geoengineering is regarded by advocates as a creative and responsible technological option in the face of a climate emergency. Critics often see it as a hubristic attempt to play God, with disastrous consequences for the planet and humanity. These antipodal perspectives are represented by the ideal types of Prometheans and Gaians. Prometheans and Gaians typically talk past each other. The geoengineering debate can be made more fruitful by well articulating their respective positions and subsequently situating them in the discourse of sustainability. A sustainability orientation does not answer the troubling question whether geoengineering should be developed and deployed. But it can foster a ‘fusion of horizons’ between Prometheans and Gaians, providing common ground in an otherwise polarized debate and making a more productive dialogue possible.  相似文献   
238.
Giorel Curran 《环境政策》2019,28(5):950-969
ABSTRACT

Renewable energy (RE) illustrates well the logic of ecological modernisation (EM). This logic has successfully transformed RE from a fringe idea owned by largely environmental actors to a mainstream one embraced by a broader constituency. This mainstream embrace inevitably (re)shapes the renewables enterprise. Not all renewables actors today are driven by environmental goals. Instead, key actors, particularly in corporate or community domains, nurture competing norms and aspirations. How the renewables project is envisaged and the goals it is directed to serve can thus differ considerably. Understanding these differences is important since transformations in the energy domain will not only impact climate protection but shape social futures in significant ways. The analysis proceeds in two interrelated steps: first, empirically – conducting an exploration of some of the main projects and actors in the contemporary Australian RE space; and second, theoretically – considering these empirical developments through an EM lens.  相似文献   
239.
Ken Conca 《环境政策》2019,28(3):417-440
ABSTRACT

Lessons from the literature on multi-stakeholder dialogue (MSD) that are relevant to the debate on climate engineering (CE) are examined. MSDs have been used to prod slow-to-develop intergovernmental regulatory processes on a range of transnational and global controversies. A CEMSD might push forward anticipatory governance of CE by promoting social learning, sharpening and legitimizing governance norms, and starting to arrange the political space for governance by states. However, significant challenges and risks are also identified, including questions about the ripeness of the issue for stakeholder dialogue; difficult trade-offs in the design of dialogues, particularly around issues of participation and knowledge-power; and inherent tensions in the various purposes a CEMSD might serve. Given these challenges, steps forward that would better prepare a space for legitimate and effective dialogue are recommended.  相似文献   
240.
This study has shown theoretical, observed and experimental evidence of pollutants released, transported and deposited during the Kosovo conflict in 1999 and their effects on precipitation in Serbia. The greatest bombardment of the chemical industry, oil refineries and fuel storage in Serbia which occurred during April, resulted in releases of many hazardous, toxic and cancerogenic substances. The number of April's days with precipitation greater or equal to 0.1 mm in 1999 are compared to those in the period from 1961 to 1990 registered at thirty meteorological stations in Serbia and especially at the Belgrade-Observatory station in the period from 1888 to 1995. The maximums of days with precipitation greater or equal to 0.1 mm were at the wider Belgrade area and at the central and southwestern parts of Serbia during April 1999. This is confirmed by using the Eta trajectory analysis.  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