全文获取类型
收费全文 | 34783篇 |
免费 | 366篇 |
国内免费 | 275篇 |
专业分类
安全科学 | 973篇 |
废物处理 | 1453篇 |
环保管理 | 4801篇 |
综合类 | 5348篇 |
基础理论 | 9554篇 |
环境理论 | 14篇 |
污染及防治 | 9347篇 |
评价与监测 | 2174篇 |
社会与环境 | 1514篇 |
灾害及防治 | 246篇 |
出版年
2022年 | 226篇 |
2021年 | 266篇 |
2019年 | 249篇 |
2018年 | 424篇 |
2017年 | 447篇 |
2016年 | 734篇 |
2015年 | 574篇 |
2014年 | 866篇 |
2013年 | 2834篇 |
2012年 | 1046篇 |
2011年 | 1428篇 |
2010年 | 1149篇 |
2009年 | 1238篇 |
2008年 | 1469篇 |
2007年 | 1575篇 |
2006年 | 1387篇 |
2005年 | 1156篇 |
2004年 | 1168篇 |
2003年 | 1105篇 |
2002年 | 1075篇 |
2001年 | 1347篇 |
2000年 | 1006篇 |
1999年 | 568篇 |
1998年 | 444篇 |
1997年 | 448篇 |
1996年 | 493篇 |
1995年 | 523篇 |
1994年 | 501篇 |
1993年 | 460篇 |
1992年 | 432篇 |
1991年 | 419篇 |
1990年 | 447篇 |
1989年 | 418篇 |
1988年 | 390篇 |
1987年 | 369篇 |
1986年 | 330篇 |
1985年 | 314篇 |
1984年 | 383篇 |
1983年 | 344篇 |
1982年 | 389篇 |
1981年 | 359篇 |
1980年 | 297篇 |
1979年 | 320篇 |
1978年 | 262篇 |
1977年 | 231篇 |
1976年 | 209篇 |
1975年 | 213篇 |
1974年 | 210篇 |
1973年 | 224篇 |
1972年 | 230篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
221.
222.
R. W. ABRAMS ENO D. ANWANA† ALISON ORMSBY‡ DELALI B. K. DOVIE§ ADEMOLA AJAGBE AMBER ABRAMS†† 《Conservation biology》2009,23(4):799-804
Abstract: Developed nations intervened in conservation policy across Africa during the 20th century to address needs to protect species and biodiversity that were based on their own perceptions and priorities. In the 21st century, conservationists in Africa have revised these perceptions and begun the process of identifying conservation priorities from an African perspective and in consideration of Africans' priorities. Although foreign conservation interveners struggled to identify mechanisms to which local people would respond, African conservationists are now demonstrating how to integrate the continent's unique socioeconomic circumstances into efforts to protect biodiversity. In Africa effective conservation policy must include the generation of wealth, reduction of disease and hunger, and support of traditional land-use practices. 相似文献
223.
224.
REED F. NOSS ERICA FLEISHMAN† DOMINICK A. DELLASALA‡ JOHN M. FITZGERALD§ MART R. GROSS MARTIN B. MAIN†† FIONA NAGLE‡‡ STACEY L. O'MALLEY JON ROSALES§§ 《Conservation biology》2009,23(4):825-833
Abstract: The Society for Conservation Biology (SCB) can enhance conservation of biodiversity in North America by increasing its engagement in public policy. Toward this end, the North America Section of SCB is establishing partnerships with other professional organizations in order to speak more powerfully to decision makers and taking other actions—such as increasing interaction with chapters—geared to engage members more substantively in science-policy issues. Additionally, the section is developing a North American Biodiversity Blueprint, which spans the continental United States and Canada and is informed by natural and social science. This blueprint is intended to clarify the policy challenges for protecting continental biodiversity, to foster bilateral collaboration to resolve common problems, and to suggest rational alternative policies and practices that are more likely than current practices to sustain North America's natural heritage. Conservation scientists and practitioners can play a key role by drawing policy makers' attention to ultimate, as well as proximate, causes of biodiversity decline and to the ecological and economic consequences of not addressing these threats. 相似文献
225.
226.
Ronald R. Swaisgood 《Conservation biology》2009,23(5):1338-1340
227.
228.
229.
230.