全文获取类型
收费全文 | 2081篇 |
免费 | 34篇 |
国内免费 | 15篇 |
专业分类
安全科学 | 69篇 |
废物处理 | 74篇 |
环保管理 | 378篇 |
综合类 | 336篇 |
基础理论 | 483篇 |
环境理论 | 4篇 |
污染及防治 | 532篇 |
评价与监测 | 151篇 |
社会与环境 | 91篇 |
灾害及防治 | 12篇 |
出版年
2023年 | 25篇 |
2022年 | 23篇 |
2021年 | 28篇 |
2020年 | 25篇 |
2019年 | 30篇 |
2018年 | 41篇 |
2017年 | 55篇 |
2016年 | 50篇 |
2015年 | 53篇 |
2014年 | 56篇 |
2013年 | 155篇 |
2012年 | 80篇 |
2011年 | 122篇 |
2010年 | 85篇 |
2009年 | 99篇 |
2008年 | 109篇 |
2007年 | 131篇 |
2006年 | 94篇 |
2005年 | 81篇 |
2004年 | 81篇 |
2003年 | 77篇 |
2002年 | 83篇 |
2001年 | 42篇 |
2000年 | 34篇 |
1999年 | 28篇 |
1998年 | 28篇 |
1997年 | 27篇 |
1996年 | 22篇 |
1995年 | 27篇 |
1994年 | 26篇 |
1993年 | 13篇 |
1992年 | 17篇 |
1991年 | 18篇 |
1990年 | 14篇 |
1989年 | 17篇 |
1988年 | 18篇 |
1987年 | 14篇 |
1986年 | 18篇 |
1985年 | 9篇 |
1984年 | 11篇 |
1983年 | 11篇 |
1982年 | 12篇 |
1981年 | 9篇 |
1980年 | 8篇 |
1979年 | 14篇 |
1978年 | 8篇 |
1977年 | 9篇 |
1975年 | 8篇 |
1974年 | 8篇 |
1954年 | 8篇 |
排序方式: 共有2130条查询结果,搜索用时 15 毫秒
441.
442.
Peter Martin 《Environmental management》1991,15(6):773-783
Substantial land degradation of agricultural catchments in Australia has resulted from the importation of European farming
methods and the large-scale clearing of land. Rural communities are now being encouraged by government to take responsibility
for environmental care.
The importance of community involvement is supported by the view that environmental problems are a function of interactions
between people and their environment. It is suggested that the commonly held view that community groups cannot care for their
resources is due to inappropriate social institutions rather that any inherent disability in people.
The communicative catchment is developed as a vision for environmental care into the future. This concept emerges from a critique
of resource management through the catchment metaphors of the reduced, mechanical, and the complex, evolving catchment, which
reflect the development of systemic and people-centered approaches to environmental care. The communicative catchment is one
where both community and resource managers participate collaboratively in environmental care. A methodology based on action
research and systemic thinking (systemic action research) is proposed as a way of moving towards the communicative catchment
of the future. Action research is a way of taking action in organizations and communities that is participative and informed
by theory, while systemic thinking takes into account the interconnections and relationships between social and natural worlds.
The proposed vision, methodology, and practical operating principles stem from involvement in an action research project looking
at extension strategies for the implementation of total catchment management in the Hunter Valley, New South Wales. 相似文献
443.
William R. Walker Carol J. Haley Phyllis Bridgeman Stephen H. Goldstein 《Environmental management》1991,15(3):441-449
A literature search and survey of Virginia, USA, campgrounds with RV pump-out stations were used to determine whether boat
holding-tank deodorant chemicals would have deleterious effects on marina septic systems or package treatment plants. Laboratory
studies reported in the literature indicate that these chemical additives could affect septic system function in three ways:
(1) active ingredients in the additives can impair sewage degradation in septic tanks, causing sludge buildup and overflow
of solids into the drainfield, (2) additive chemicals might enter the drainfield and, in high enough concentrations, reduce
the drainfield's ability to degrade waste, or (3) toxic additive chemicals might migrate from the drainfield to ground or
surface water. Laboratory studies also show that some ingredients added to holding tanks interfere with functioning of activated
sludge treatment process. Experience in the field and in other laboratory studies suggests that factors such as dilution of
treated waste with untreated waste and the characteristics of the sewage to be treated can reduce the possibility of damage
to septic and activated sludge systems. The campground owners surveyed indicated that they have few problems with their septic
systems in spite of the presence of chemical additives in the RV waste. However, most of them practice good septic system
maintenance and have devised other means of ensuring that their systems function efficiently. In addition, the survey indicates
that most Virginia campgrounds get only seasonal use (as would marinas in Virginia), allowing their systems to recover between
peak seasons. 相似文献
444.
Martin G. Beyer 《Natural resources forum》1991,15(2):118-122
The Global Consultation on Safe Water and Sanitation for the 1990s was an outstanding opportunity for participants from 102 developing countries along with over 60 External Support Agencies (ESA) to assess the experiences of the International Drinking Water Supply and Sanitation Decade 1981–1990 (IDWSSD) and to reach a consensus on strategies and approaches for complete and effective coverage of water supply and sanitation. The resulting New Delhi Statement summarizing the conclusions and recommendations of the Global Consultation was presented to the General Assembly in autumn 1990. As one of the positive results, the New Delhi Consultation agreed that the UN Agencies and other bodies should continue the coordination work of the Steering Committee for Water Supply and Sanitation. It also provided a basis for the restructuring and consolidation of the new Collaborative Council for Water Supply and Sanitation, which will form a continuous consultative body for all UN agencies, NGOs, other external support agencies and developing countries concerned with the water sector. 相似文献
445.
446.
447.
448.
449.
450.