全文获取类型
收费全文 | 41648篇 |
免费 | 471篇 |
国内免费 | 561篇 |
专业分类
安全科学 | 1312篇 |
废物处理 | 1821篇 |
环保管理 | 5374篇 |
综合类 | 7336篇 |
基础理论 | 10769篇 |
环境理论 | 24篇 |
污染及防治 | 10621篇 |
评价与监测 | 2735篇 |
社会与环境 | 2408篇 |
灾害及防治 | 280篇 |
出版年
2022年 | 401篇 |
2021年 | 403篇 |
2020年 | 311篇 |
2019年 | 372篇 |
2018年 | 596篇 |
2017年 | 643篇 |
2016年 | 972篇 |
2015年 | 749篇 |
2014年 | 1107篇 |
2013年 | 3377篇 |
2012年 | 1382篇 |
2011年 | 1852篇 |
2010年 | 1501篇 |
2009年 | 1584篇 |
2008年 | 1858篇 |
2007年 | 1921篇 |
2006年 | 1683篇 |
2005年 | 1420篇 |
2004年 | 1306篇 |
2003年 | 1393篇 |
2002年 | 1246篇 |
2001年 | 1566篇 |
2000年 | 1143篇 |
1999年 | 696篇 |
1998年 | 493篇 |
1997年 | 495篇 |
1996年 | 520篇 |
1995年 | 576篇 |
1994年 | 585篇 |
1993年 | 506篇 |
1992年 | 520篇 |
1991年 | 496篇 |
1990年 | 544篇 |
1989年 | 463篇 |
1988年 | 402篇 |
1987年 | 369篇 |
1986年 | 344篇 |
1985年 | 372篇 |
1984年 | 394篇 |
1983年 | 381篇 |
1982年 | 369篇 |
1981年 | 357篇 |
1980年 | 302篇 |
1979年 | 314篇 |
1978年 | 260篇 |
1977年 | 213篇 |
1975年 | 202篇 |
1974年 | 212篇 |
1972年 | 220篇 |
1971年 | 203篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
Gustavo Hallwass Renato A.M. Silvano 《Journal of Environmental Planning and Management》2016,59(9):1537-1559
Tropical fisheries, which are considered multi-species, may show selectiveness. We analyzed the degree of selectivity of fish catches in 46 sites along the Amazon basin through the percentage of biomass corresponding to the most caught fish species. Amazonian fisheries were considered moderately selective, as 54% of the sites directed more than a quarter of fishing effort to one fish species and in 87% of the sites more than half the fishing effort was directed to five fish species. Commercial fisheries were more selective than subsistence fisheries. Eleven fish species (nine of them migratory) have received more fishing pressure in the studied Amazonian regions and the catch composition differed among regions. We thus recommend that fisheries management in the Amazon basin should distribute fishing effort among more fish species; incorporate the particularities of commercial and subsistence fisheries; evaluate fishing effects on ecosystem services; and consider the biological characteristics of preferred fish. 相似文献
972.
973.
974.
975.
Analysis of uncertainty consideration in environmental assessment: an empirical study of Canadian EA practice 总被引:1,自引:0,他引:1
Juliette Lees Jill A.E. Gunn Bram F. Noble 《Journal of Environmental Planning and Management》2016,59(11):2024-2044
Identifying and communicating uncertainty is core to effective environmental assessment (EA). This study evaluates the extent to which uncertainties are considered and addressed in Canadian EA practice. We reviewed the environmental protection plans, follow-up programs, and panel reports (where applicable) of 12 EAs between 1995 and 2012. The types of uncertainties and levels of disclosure varied greatly. When uncertainties were acknowledged, practitioners adopted five different approaches to address them. However, uncertainties were never discussed or addressed in depth. We found a lack of suitable terminology and consistency in how uncertainties are disclosed, reflecting the need for explicit guidance, and we present recommendations for improvement. Canadian Environmental Impact Statements are not as transparent with respect to uncertainties as they should be, and uncertainties in EA need to be better considered and communicated. 相似文献
976.
Protected areas’ role in climate-change mitigation 总被引:1,自引:0,他引:1
977.
Marlene Roellig Laura M. E. Sutcliffe Marek Sammul Henrik von Wehrden Jens Newig Joern Fischer 《Ambio》2016,45(2):185-195
Wood-pastures are associated with high cultural and biodiversity values in Europe. However, due to their relatively low productivity, large areas of wood-pastures have been lost over the last century. In some areas, incentive schemes have been developed to revive wood-pastures. We investigated the effects of one such scheme in western Estonia. We compared the structure of grazed wood-pastures (old and restored) to those of abandoned wood-pastures and ungrazed forest stands to explore the effects of management, and conducted interviews with 24 farmers to investigate their motivations to carry out the management. We found a positive influence of active management on the semi-open structure of wood-pastures. Financial support was vital for management, but personal values related to tradition also played an important role. The interviewees differed widely in their range of motivations, suggesting that other strategies in addition to financial incentives would further improve the management of wood-pastures in the region.
Electronic supplementary material
The online version of this article (doi:10.1007/s13280-015-0719-8) contains supplementary material, which is available to authorized users. 相似文献978.
Anouk N’Guyen Philipp E. Hirsch Irene Adrian-Kalchhauser Patricia Burkhardt-Holm 《Ambio》2016,45(3):280-289
Managing invasive species is a major challenge for society. In the case of newly established invaders, rapid action is key for a successful management. Here, we develop, describe and recommend a three-step transdisciplinary process (the “butterfly model”) to rapidly initiate action for invasion management. In the framing of a case study, we present results from the first of these steps: assessing priorities and contributions of both scientists and decision makers. Both scientists and decision makers prioritise research on prevention. The available scientific knowledge contributions, however, are publications on impacts rather than prevention of the invasive species. The contribution of scientific knowledge does thus not reflect scientists’ perception of what is essentially needed. We argue that a more objective assessment and transparent communication of not only decision makers’ but also scientists’ priorities is an essential basis for a successful cooperation. Our three-step model can help achieve objectivity via transdisciplinary communication. 相似文献
979.
David A. Ross Héctor M. Guzmán Vincent J. Van Hinsberg Catherine Potvin 《Journal of environmental science and health. Part. B》2016,51(10):675-687
Concentrations of eight elements were measured in Chelonia mydas and Lepidochelys olivacea eggs collected along the Pacific coast of Panama. Manganese (Mn), iron (Fe), copper (Cu), zinc (Zn), arsenic (As), cadmium (Cd), and mercury (Hg) concentrations were similar to previous reports of these species from around the world, while lead (Pb) was lower than previous reports. Cd posed the highest health risk to people who regularly eat the eggs, with average consumption rates leading to target hazard quotients (THQ) of up to 0.35 ± 0.15. Our conclusions indicate that current turtle egg consumption in isolated, coastal Pacific communities may pose a health concern for young children, and that youth and young adults should limit their consumption of turtle eggs to reduce their total intake of nonessential metals. 相似文献