全文获取类型
收费全文 | 352篇 |
免费 | 24篇 |
国内免费 | 17篇 |
专业分类
安全科学 | 31篇 |
废物处理 | 1篇 |
环保管理 | 79篇 |
综合类 | 93篇 |
基础理论 | 86篇 |
环境理论 | 4篇 |
污染及防治 | 15篇 |
评价与监测 | 9篇 |
社会与环境 | 42篇 |
灾害及防治 | 33篇 |
出版年
2023年 | 3篇 |
2022年 | 8篇 |
2021年 | 8篇 |
2020年 | 11篇 |
2019年 | 18篇 |
2018年 | 9篇 |
2017年 | 12篇 |
2016年 | 11篇 |
2015年 | 18篇 |
2014年 | 9篇 |
2013年 | 20篇 |
2012年 | 17篇 |
2011年 | 36篇 |
2010年 | 16篇 |
2009年 | 17篇 |
2008年 | 21篇 |
2007年 | 22篇 |
2006年 | 17篇 |
2005年 | 11篇 |
2004年 | 14篇 |
2003年 | 10篇 |
2002年 | 14篇 |
2001年 | 17篇 |
2000年 | 14篇 |
1999年 | 5篇 |
1998年 | 7篇 |
1997年 | 6篇 |
1996年 | 4篇 |
1995年 | 6篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1985年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有393条查询结果,搜索用时 62 毫秒
101.
C. A. Kessler 《Environment, Development and Sustainability》2008,10(2):233-247
In Bolivia, recent decentralisation policies have broadened the participation of local actors in development processes. However,
development is far from sustainable, and poverty and natural resources degradation still increase. The challenge is to develop
strategies that achieve the genuine participation of poor farmers in natural resources management and sustainable development.
The logical strategy, which was developed and validated in five Bolivian mountain villages, is an example. In this strategy,
first a solid foundation for sustainable development is laid, with activities focussing on five basic conditions for sustainable
development in rural villages: leadership and organisation, responsible participation, effective collaboration, mutual trust
and environmental awareness. The results show that the existence of a solid foundation is crucial for the success of other
development activities, such as soil and water conservation activities. However, given that 2 years after the project’s withdrawal
the firmness of the foundation had slightly weakened, it was concluded that a better integration of these villages in local
development processes is essential to profit from the new dynamics. This is especially true for soil and water conservation.
To achieve this integration, municipalities—with the support of international development agencies—must be encouraged to invest
in laying this solid foundation in rural villages and in facilitating follow-up activities to keep the dynamic process going.
This study shows that such investments result in better organised villages, more equality, and the genuine participation of
more people in sustainable village development. Effective collaboration and accountability at institutional level are, however,
required. 相似文献
102.
The composition of the herbaceous cover and the seed bank of old and recent hedge banks in Brittany were studied and compared. Concentration method was used for seed bank samples. Grimes plant strategies were used to explain observed patterns. The analysis of the seed bank of these hedge banks showed that the species richness and diversity differed in relation to the date of construction of the hedge banks. The seed banks of recent hedge banks were richer and more diversified than those of old hedge banks. Differences in the floristic composition of the established plant cover between the recent and old hedge banks were determined by multivariate analyses. The species exclusively found in the seed bank and in the herb cover of recent hedge banks were mainly grassland species, whereas the species that only occurred on old hedge banks tended to be woodland species. The floristic composition of the two compartments (established vegetation and seed bank) was very different. A multivariate analysis revealed that the difference between the composition of the seed banks of recent and old hedge banks was less than that between the composition of the established vegetation and seed bank of hedge banks of the same age. Both seed bank and vegetation of recent hedge banks were dominated by ruderal species, whereas old hedge vegetation was dominated by stress-tolerant woodland species, indicating that mechanically constructed hedge banks may impose limitations on colonization by late woodland species. 相似文献
103.
长江三角洲耕地资源态势与保护对策 总被引:20,自引:7,他引:13
长江三角洲是我国东部沿海经济最发达的地区,在全国占有十分重要的经济地位。随着经济的发展,资源与环境发生了严重的问题,特别是近年来耕地资源锐减,而后备耕地资源却短缺,人地人粮矛盾更加尖锐,已成为影响这一地区农业持续发展的重要因素。本文分析了这一地区的经济特点与耕地资源的变化态势,并提出了相应的耕地保护措施。首先,要严格控制非农用地,确保基本农田,其次要采用经济手段,建立保护耕地的经济机制;此外,还要 相似文献
104.
Methane fluxes from artificial wetlands: A global appraisal 总被引:1,自引:0,他引:1
Methane emissions make an important contribution to the enhanced greenhouse effect, emissions from rice growing being one
of its major anthropogenic sources. The estimation of global fluxes of methane from rice and from coarse fiber production
depends on extrapolating observed data across countries and agroclimatic zones: the estimates are therefore imprecise. We
present a revised estimate of global emissions of 96 Tg CH4/yr, given 1991 rice areas, and 1991 production data for those tropical coarse fibers that also produce methane under anaerobic
conditions. This is higher than many previous studies, which systematically underestimated the fluxes from tropical countries.
As the world's population increases, the demand for rice will rise. This demand can only be satisfied through greater rice
production, either by bringing new areas into rice growing or by using the present area more intensively. Strategies based
on improved water management and fertilizer use will allow increased rice production and yields and reduce the methane flux
per unit or rice production. 相似文献
105.
106.
作者以生态旅游理论为基础,分析了我国森林生态旅游的发展状况,并以加入WTO为背景从中找出存在的问题,进而提出入世后推进我国森林生态旅游发展的对策。 相似文献
107.
Climate change is a significant environmental, social and environmental problem that has been identified by scientists in
consensus internationally. The Australian Government’s response is considered by environmental non-government organisations
(NGOs) to be inadequate. NGOs are ‘change agents’ of society, and in this role they are agitating to influence political decision-making
on climate change response.
This paper outlines the campaign strategies being used by Australian NGOs to attract public and political attention to the
issue of climate change. Using seven NGOs as case studies, the archival materials of these organisations were accessed and
analysed. Current academic and other literature also was used to reflect on their effectiveness. Four campaign themes and,
within these, fifteen activities were identified.
The results indicate that the notion of whether NGOs are undertaking an ‘revolutionary’ or ‘incremental’ approach, or any
other narrow strategic approach put forward by various scholars is too simple for analysing campaigns: none of the NGOs appear
to intentionally favour one type of strategy. The question raised by this finding is whether the NGOs’ current ‘multi-strategic’
approach is effective. This research contributes to filling the information gap with regard to NGO campaign strategies on
environmental issues, and highlights the need for further research. 相似文献
108.
109.
根据近17年的莆田市气候影响评价资料,结合实地调查,对莆田市台风、暴雨、冰雹、干旱、寒潮等主要气象灾害的基本特点进行了分析。研究表明,近17年莆田市危害最大的气象灾害是台风灾害,其次为洪涝灾害,揭示了几种主要气象灾害之间的相互关系,并提出相应的减灾对策。 相似文献
110.
While basic guidelines on HIV prevention in emergencies have been available for several years, international agencies involved in the provision of health services have not placed sufficient priority on the prevention of the human immune deficiency virus (HIV) and other sexually transmitted infections (STIs) in complex emergencies. This paper reviews the factors that may increase the risk of HIV transmission in populations affected by complex emergencies and outlines recommendations for research and programmes. Research into the most appropriate methods of carrying out HIV surveillance and interventions in these settings is needed. In the post-emergency phase programmes need to be far more extensive than those offered under the Minimal Initial Services Package (MISP). While the potential for stigmatization represents an important constraint, there is a need to prioritize HIV/STI interventions in order to prevent HIV transmission in emergency-affected populations themselves, as well as to contribute to regional control of the epidemic. 相似文献