全文获取类型
收费全文 | 4234篇 |
免费 | 689篇 |
国内免费 | 1135篇 |
专业分类
安全科学 | 271篇 |
废物处理 | 41篇 |
环保管理 | 1105篇 |
综合类 | 1914篇 |
基础理论 | 1889篇 |
环境理论 | 6篇 |
污染及防治 | 282篇 |
评价与监测 | 111篇 |
社会与环境 | 246篇 |
灾害及防治 | 193篇 |
出版年
2024年 | 28篇 |
2023年 | 154篇 |
2022年 | 233篇 |
2021年 | 269篇 |
2020年 | 247篇 |
2019年 | 291篇 |
2018年 | 278篇 |
2017年 | 289篇 |
2016年 | 299篇 |
2015年 | 302篇 |
2014年 | 284篇 |
2013年 | 668篇 |
2012年 | 276篇 |
2011年 | 318篇 |
2010年 | 259篇 |
2009年 | 235篇 |
2008年 | 214篇 |
2007年 | 261篇 |
2006年 | 170篇 |
2005年 | 152篇 |
2004年 | 131篇 |
2003年 | 89篇 |
2002年 | 93篇 |
2001年 | 90篇 |
2000年 | 78篇 |
1999年 | 45篇 |
1998年 | 31篇 |
1997年 | 29篇 |
1996年 | 39篇 |
1995年 | 22篇 |
1994年 | 25篇 |
1993年 | 25篇 |
1992年 | 13篇 |
1991年 | 9篇 |
1990年 | 8篇 |
1989年 | 6篇 |
1988年 | 8篇 |
1987年 | 10篇 |
1986年 | 7篇 |
1985年 | 8篇 |
1984年 | 6篇 |
1983年 | 9篇 |
1982年 | 8篇 |
1981年 | 9篇 |
1980年 | 9篇 |
1979年 | 5篇 |
1978年 | 5篇 |
1977年 | 2篇 |
1975年 | 2篇 |
1971年 | 5篇 |
排序方式: 共有6058条查询结果,搜索用时 312 毫秒
571.
Marshall Gysi 《Journal of the American Water Resources Association》1975,11(3):551-558
ABSTRACT: The present energy and environmental crises are due to increasing per capita demands as well as increasing populations. The role that traditional pricing policies have played in promoting these demands is discussed. The reduction or stabilizing of per capita demands is advocated through the use of Conservational Pricing mechanisms which charge higher average prices for high consumption. An example of the effect of Conservational Pricing in the water supply industry is given. 相似文献
572.
The Przewalski's gazelle, Procapra przewalskii, is now isolated in four local populations on the east and northwest shores of Qinghai Lake. We have been being conducting field surveys in the Qinghai Lake region since 1994. Based on the information we gathered from those surveys, we carried out a Population Viability Analysis (PVA) on the Przewalski's gazelle. We discovered that the Przewalski's gazelle would be extinct within 200 years if no management measures were taken. Since the local population size of the gazelle is small, the most effective measures are to control the wolf density and to reduce the impact of climatic catastrophes. In order to increase the population of the gazelle, we should also take measures to increase primary production of the grassland, to establish a habitat corridor, and to increase the rate of migration of individuals among different local populations. 相似文献
573.
推进我国减灾事业的三个支柱 总被引:1,自引:1,他引:0
本文阐述推进我国减灾事业的3个支柱,即:(1)发挥政府的主导作用;(2)重视科学技术在减灾中的作用;(3)依靠全民的参与。 相似文献
574.
王鹤祥 《中国人口.资源与环境》1992,(3)
社区(Community)是一个有着明确边界、范围和居住着有各方面联系的人的社会区域。社区的建设和发展是一种有目标、有计划的引导社会变迁的行动过程,是一项庞大而复杂的系统工程。本文提出了社区工作研究的总体构思;并建立了由人口、教科文、生活质量、社会保障、健康水平、妇女地位、环境保护等因素组成的社区综合发展评价指标体系;并构造了综合评价数学模型。 相似文献
575.
延吉市产业结构调整与知识产业发展 总被引:1,自引:0,他引:1
延吉市土地面积小 ,水土资源紧张 ,人口与环境压力较大 ,但智力资源丰富。延吉市已经形成以二、三产业为主导的产业体系 ,但产业内部存在结构性问题。文章认为产业结构调整与发展知识产业相结合是实现城市可持续发展的重要途径 ,进而探讨了延吉市产业结构调整思路 ,提出知识产业发展方向。 相似文献
576.
In recent years, churches across the world have become involved in dialogue on the theory and practice of sustainable development. A number of Western churches have expressed their concern about climate change and destructive living patterns, stressing the need for human beings to exercise the care for all creation based on a life of sharing and sacrifice. Some Orthodox churches, however, quite recently included the environmental issues in their agendas. While the Bases of Social Concept, a major doctrine of the Russian Orthodox Church adopted in 2000, for the first time emphasises the Churchs position in overcoming environmental crisis and presents a solid basis on which to build the future environmental strategy of the Church, the Ethiopian Orthodox Church has not yet drawn up a programme document that might serve as a framework for the Churchs current extensive activities in the field of biodiversity conservation and sustainable forestry practices. Hence, despite certain closeness of both institutions, there is the potential for strengthening their roles in promoting sustainable development, based on the Biblical concept that the Earth belongs to the Lord and humans are responsible stewards assigned the duty to work for creation and care for it. This paper seeks to demonstrate by means of comparable analysis between the two Churches, Orthodox in nature but different in rites and religious practices, that traditional, highly conservative faiths may serve as powerful instruments of spreading out the ideas of sustainable development as the basis of spiritual revival in the situation of the two concurrent and interrelated crises – spiritual and ecological.Readers should send their comments on this paper to: BhaskarNath@aol.com within 3 months of publication of this issue. 相似文献
577.
Public Participation and Effective Water Governance at the Local Level: A Case Study from a Small Under-Developed Area in Chile 总被引:1,自引:0,他引:1
Tarisai?Garande Suzan?DaggEmail author 《Environment, Development and Sustainability》2005,7(4):417-431
The concept of participation in rural development has been evolutionary for the past two decades with those involved, such
as development agencies and governments, particularly in rural water supply, re-evaluating their active role. The move towards
effective community participation has encouraged a shift from the traditional top-down to a bottom-up approach whereby there
is a decentralisation of unevenly distributed resources and power to empower a community and allow mobility of ‘people participation’.
The Molinos water project is the first large-scale development project of its kind introduced into the village of Molinos
in an under-developed area of Chile, where there has been no tradition of people participation. The project objective was
to implement a low technology, low budget water treatment plant to the village of Molinos. Various aspects have hindered the
continued development of the project including both technical and financial. In terms of people participation, the initial
approach used was the top-down approach. There was a failure to fully integrate the community or inform the community in a
formal manner about the project and consult them regarding key project issues. This case study illustrates that the lack of
comprehensive consultation and the low level of participation of the community on the participatory scale does not achieve
much in terms of people-centred benefits. For governance at the local level to be effective, participation should be inclusive and communicative so as to
enhance transparency throughout the project lifetime.
Readers should send their comments on this paper to: BhaskarNath@aol.com within 3 months of publication of this issue. 相似文献
578.
Perceived Impacts of Ecotourism on Environmental Learning and Conservation: Turtle Watching as a Case Study 总被引:1,自引:0,他引:1
Clem?TisdellEmail author Clevo?Wilson 《Environment, Development and Sustainability》2005,7(3):291-302
Using a case study, involving turtle-based ecotourism, we explore the role of ecotourism in promoting environmental learning
and in sustaining conservation of nature. Mon Repos Conservation Park (an important marine turtle rookery involved in ecotourism)
in Queensland, Australia, was selected for this study and visitors were surveyed using a structured questionnaire. The reported
on-site experiences of respondents are analysed to identify important factors that alter their stated conservation attitudes
and behaviours. The impact of these factors (such as the amount of environmental education that respondents claimed they obtained,
sighting of sea turtles, nationality) is quantified using regression analyses. There has been little previous quantification
of such influences. The study reveals that a considerable amount of environmental knowledge is gained by visitors to Mon Repos.
The ecotourism experience, involving environmental education and seeing of turtles, was found to have positive and statistically
significant impacts on the visitors' stated desire and intended behaviour to protect sea turtles. The study reveals the importance
of learning and the interaction of tourists with wildlife as a contributor to their pro-conservation sentiments and actions.
It shows how ecotourism can support nature conservation.
Readers should send their comments on this paper to: BhaskarNath@aol.com within 3 months of publication of this issue. 相似文献
579.
580.
Nina Rønsted Seana K. Walsh Margaret Clark Merlin Edmonds Tim Flynn Scott Heintzman Alexander Loomis David Lorence Uma Nagendra Ben Nyberg Michael Opgenorth Lauren Weisenberger Adam Williams Dustin Wolkis Kenneth R. Wood Matthew Keir 《Conservation biology》2022,36(4):e13896
The International Union for Conservation of Nature's Red List of Threatened Species (IUCN Red List) is the world's most comprehensive information source on the global conservation status of species. Governmental agencies and conservation organizations increasingly rely on IUCN Red List assessments to develop conservation policies and priorities. Funding agencies use the assessments as evaluation criteria, and researchers use meta-analysis of red-list data to address fundamental and applied conservation science questions. However, the circa 143,000 IUCN assessments represent a fraction of the world's biodiversity and are biased in regional and organismal coverage. These biases may affect conservation priorities, funding, and uses of these data to understand global patterns. Isolated oceanic islands are characterized by high endemicity, but the unique biodiversity of many islands is experiencing high extinction rates. The archipelago of Hawaii has one of the highest levels of endemism of any floristic region; 90% of its 1367 native vascular plant taxa are classified as endemic. We used the IUCN's assessment of the complete single-island endemic (SIE) vascular plant flora of Kauai, Hawaii, to assess the proportion and drivers of decline of threatened plants in an oceanic island setting. We compared the IUCN assessments with federal, state, and other local assessments of Kauai species or taxa of conservation concern. Finally, we conducted a preliminary assessment for all 1044 native vascular plants of Hawaii based on IUCN criterion B by estimating area of occupancy, extent of occurrence, and number of locations to determine whether the pattern found for the SIE vascular flora of Kauai is comparable to the native vascular flora of the Hawaiian Islands. We compared our results with patterns observed for assessments of other floras. According to IUCN, 256 SIE vascular plant taxa are threatened with extinction and 5% are already extinct. This is the highest extinction risk reported for any flora to date. The preliminary assessment of the native vascular flora of Hawaii showed that 72% (753 taxa) is threatened. The flora of Hawaii may be one of the world's most threatened; thus, increased and novel conservation measures in the state and on other remote oceanic islands are urgently needed. 相似文献