全文获取类型
收费全文 | 5190篇 |
免费 | 190篇 |
国内免费 | 191篇 |
专业分类
安全科学 | 243篇 |
废物处理 | 51篇 |
环保管理 | 1279篇 |
综合类 | 2219篇 |
基础理论 | 425篇 |
环境理论 | 19篇 |
污染及防治 | 360篇 |
评价与监测 | 706篇 |
社会与环境 | 227篇 |
灾害及防治 | 42篇 |
出版年
2024年 | 3篇 |
2023年 | 41篇 |
2022年 | 51篇 |
2021年 | 83篇 |
2020年 | 189篇 |
2019年 | 89篇 |
2018年 | 84篇 |
2017年 | 137篇 |
2016年 | 175篇 |
2015年 | 132篇 |
2014年 | 226篇 |
2013年 | 277篇 |
2012年 | 214篇 |
2011年 | 372篇 |
2010年 | 195篇 |
2009年 | 315篇 |
2008年 | 253篇 |
2007年 | 271篇 |
2006年 | 265篇 |
2005年 | 143篇 |
2004年 | 155篇 |
2003年 | 211篇 |
2002年 | 195篇 |
2001年 | 196篇 |
2000年 | 219篇 |
1999年 | 183篇 |
1998年 | 158篇 |
1997年 | 159篇 |
1996年 | 100篇 |
1995年 | 73篇 |
1994年 | 85篇 |
1993年 | 79篇 |
1992年 | 54篇 |
1991年 | 31篇 |
1990年 | 16篇 |
1989年 | 19篇 |
1988年 | 11篇 |
1987年 | 11篇 |
1986年 | 19篇 |
1985年 | 16篇 |
1984年 | 15篇 |
1983年 | 5篇 |
1982年 | 8篇 |
1981年 | 6篇 |
1980年 | 6篇 |
1979年 | 2篇 |
1978年 | 11篇 |
1977年 | 5篇 |
1975年 | 2篇 |
1974年 | 3篇 |
排序方式: 共有5571条查询结果,搜索用时 560 毫秒
191.
整体环境教育体系与实施 总被引:2,自引:0,他引:2
由环境问题的长期性、复杂性和整体性,提出建立一个全方位、多层次、适合社会各阶层的整体环境教育体系,并论述了整体环境教育的体系和模式,以及实施内容。 相似文献
192.
193.
水环境质量标准的发展探讨 总被引:3,自引:0,他引:3
从国家水环境质量标准的修改和测试项目的增减出发,阐述了我国水环境质量标准发展的历史和现状,以及可能产生的影响,分析了国内外水环境质量标准的差异,并提出相关建议。 相似文献
194.
195.
总结了闵行区在创建环保模范城区工作中的主要做法,并以具体数据比较了创模前后该区的环境效益、经济效益及社会效益。结果表明,通过创模,全区的污染物排放总量得到了很大削减,环境质量有明显提高,投资环境有进一步改善。 相似文献
196.
随着人类环境意识的觉醒与升华,引发了对自身生存环境的更深层次的思考。本文就环境承载力的内涵与外延以及它既会造成贫困又可解脱贫困的关键作用进行了研究和探讨。 相似文献
197.
198.
William G. Coleman 《Environmental management》1996,20(6):815-825
The term biodiversity describes the array of interacting, genetically distinct populations and species in a region, the communities they comprise, and the variety of ecosystems of which they are functioning parts. Ecosystem health, a closely related concept, is described in terms of a process identifying biological indicators, end points, and values. The decline of populations or species, an accelerating trend worldwide, can lead to simplification of ecosystem processes, thus threatening the stability and sustainability of ecosystem services directly relevant to human welfare in the chain of economic and ecological relationships. The challenge of addressing issues of such enormous scope and complexity has highlighted the limitations of ecology-as-science. Additionally, biosphere-scale conflicts seem to lie beyond the scope of conventional economics, leading to differences of opinion about the commodity value of biodiversity and of the services that intact ecosystems provide. In the face of these uncertainties, many scientists and economists have adopted principles that clearly assign burdens of proof to those who would promote the loss of biodiversity and that also establish near-trump (preeminent) status for ecological integrity. Electric utility facilities and operations impact biodiversity whenever construction, operation, or maintenance of generation, delivery, and support facilities alters landscapes and habitats and thereby impacts species. Although industry is accustomed to dealing with broad environmental concerns (such as global warming or acid rain), the biodiversity issue invokes hemisphere-wide, regional, local, and site-specific concerns all at the same time. Industry can proactively address these issues of scope and scale in two main ways: first, by aligning strategically with the broad research agenda put forth by informed scientists and institutions; and second, by supporting focused management processes whose results will contribute incrementally to the broader agenda of rebuilding or maintaining biodiversity. 相似文献
199.
/ The valleys of European piedmonts constitute changing narrow corridors within which water, matter, nutrients, energy, and species flow. The dispersion patterns of these flows have been significantly disturbed since the end of the 18th century. Thus, western European valleys have been changed into complex mosaics by implementation of socioeconomical programs. In order to define future actions allowing the preservation of this "ecocomplex" (Blandin and Lamotte 1988), it is necessary to gather precise information of the landscape dynamics. Hence, the study of the European river valleys must be based upon two major steps: (1)the analysis of the present landscape with suitable remote sensing techniques, allowing us to map the complex mosaic of narrow corridors; and (2) the analysis of temporal landscape development patterns since the first engineering works that have transformed the braided channel system. In this paper, the efficiency of the addition of two techniques is highlighted: (1) the "wavelet merging method" from multispectral and panchromatic SPOT images for the floodplain land-cover mapping, and (2) the historical reconstruction techniques from old maps and archive documents in order to analyze the cumulative impacts of engineering works on landscape diversity. To illustrate the method, a particularly complex case study is chosen: the Arc/Isere confluence (downstream from Albertville, Savoie, France). Remote sensing, field survey, and historical reconstruction allowed us to distinguish two types of spatial units: (1) the "functional sets" characterized by independent state factors (edaphic, hydrological, and topographic) and supporting a limited number of vegetation types (spontaneous or cultivated), and (2) the functional unit (= ecotope), which corresponds to a unique combination of vegetation type/functional set.KEY WORDS: Landscape ecology; Floodplains; Vegetation; Land use; Remote sensing; Historical reconstruction; Mapping; Merging methods; Human impacts; Alps; Isere river; France 相似文献
200.
Carter W 《Disasters》1983,7(1):34-36
This paper discusses both the need for training within a wider context of community disaster preparedness and the major alternatives in methods of training. Emphasis is placed on the importance of compatibility between the resources within a given country and appropriate training programmes. 相似文献