全文获取类型
收费全文 | 33727篇 |
免费 | 335篇 |
国内免费 | 246篇 |
专业分类
安全科学 | 999篇 |
废物处理 | 1649篇 |
环保管理 | 4515篇 |
综合类 | 4869篇 |
基础理论 | 9237篇 |
环境理论 | 8篇 |
污染及防治 | 7821篇 |
评价与监测 | 2418篇 |
社会与环境 | 2612篇 |
灾害及防治 | 180篇 |
出版年
2023年 | 132篇 |
2022年 | 260篇 |
2021年 | 319篇 |
2020年 | 195篇 |
2019年 | 243篇 |
2018年 | 847篇 |
2017年 | 849篇 |
2016年 | 1062篇 |
2015年 | 562篇 |
2014年 | 860篇 |
2013年 | 2463篇 |
2012年 | 1192篇 |
2011年 | 1921篇 |
2010年 | 1417篇 |
2009年 | 1499篇 |
2008年 | 1862篇 |
2007年 | 1954篇 |
2006年 | 1207篇 |
2005年 | 1129篇 |
2004年 | 1061篇 |
2003年 | 1072篇 |
2002年 | 1048篇 |
2001年 | 1104篇 |
2000年 | 776篇 |
1999年 | 486篇 |
1998年 | 380篇 |
1997年 | 383篇 |
1996年 | 397篇 |
1995年 | 465篇 |
1994年 | 394篇 |
1993年 | 343篇 |
1992年 | 376篇 |
1991年 | 355篇 |
1990年 | 326篇 |
1989年 | 322篇 |
1988年 | 295篇 |
1987年 | 241篇 |
1986年 | 247篇 |
1985年 | 247篇 |
1984年 | 277篇 |
1983年 | 257篇 |
1982年 | 268篇 |
1981年 | 221篇 |
1980年 | 165篇 |
1979年 | 181篇 |
1978年 | 162篇 |
1977年 | 133篇 |
1975年 | 137篇 |
1973年 | 167篇 |
1972年 | 142篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
51.
Cultural heritage is being addressed by a number of charters and conventions and it is clear that its consideration within decision-making processes is progressively becoming a real challenge, both for developers and public authorities. Against this background, this paper reviews the environmental assessment framework developed by the European Community, as this should increasingly influence decision making about cultural heritage in an urban setting. The legislative framework for access to environmental information is also reviewed because of its relevance to the decision-making process.The Directives on Environmental Impact Assessment and Strategic Environmental Assessment both require a consideration of cultural heritage in decision making. This requirement can go some way to addressing the paradox in the European Community's position whereby the community wishes to conserve and enhance its own cultural identity whilst, at the same time, cultural heritage is usually defined at a local level. The present paper suggests that, given their flexibility, the two European Community directives on environmental assessment constitute a promising opportunity to address this seeming paradox, but that there is a significant gap between legal obligations and the methodological tools to meet them. 相似文献
52.
53.
G. D. Kataev 《Russian Journal of Ecology》2005,36(6):421-426
The effect of industrial air pollution on natural small mammal populations has been studied in the northern taiga subzone of the boreal forest zone. The results of long-term monitoring have been used to demonstrate the possibility of predicting changes in the main population and community characteristics of the animal species studied as dependent on the degree of anthropogenic impact. 相似文献
54.
55.
56.
57.
58.
This work, carried out within the framework of the PRISMA II project, aims at evaluating the effects of the Po River flow on primary productivity, measured by C with in situ sample incubations. A total of four cruises was carried out in late winter and early summer (1996-1998) along transects from the coast offshore. In both seasons, the highest primary productivity was found in the most oligohaline stations. The effects of the Po River inputs were therefore clearly evident in the westernmost area, both in high productivity values and in the shape of productivity profiles. In late winter, extensive blooms of Skeletonema costatum and Pseudo-nitzschia delicatissima resulted in productivity values that were sometimes higher than in early summer. In early summer 1996, greatly reduced river flow clearly influenced productivity which was much lower than in 1997. 相似文献
59.
Russian Journal of Ecology - 相似文献
60.