首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   416篇
  免费   8篇
安全科学   28篇
废物处理   19篇
环保管理   65篇
综合类   64篇
基础理论   86篇
环境理论   1篇
污染及防治   96篇
评价与监测   36篇
社会与环境   28篇
灾害及防治   1篇
  2023年   4篇
  2022年   13篇
  2021年   14篇
  2020年   7篇
  2019年   5篇
  2018年   16篇
  2017年   18篇
  2016年   24篇
  2015年   15篇
  2014年   18篇
  2013年   44篇
  2012年   18篇
  2011年   26篇
  2010年   20篇
  2009年   12篇
  2008年   22篇
  2007年   15篇
  2006年   21篇
  2005年   12篇
  2004年   14篇
  2003年   15篇
  2002年   12篇
  2001年   4篇
  2000年   4篇
  1999年   6篇
  1998年   2篇
  1997年   4篇
  1996年   3篇
  1995年   6篇
  1994年   4篇
  1993年   3篇
  1992年   4篇
  1991年   3篇
  1988年   1篇
  1987年   1篇
  1985年   4篇
  1984年   4篇
  1983年   2篇
  1982年   3篇
  1978年   1篇
排序方式: 共有424条查询结果,搜索用时 78 毫秒
421.
Environmental Science and Pollution Research - Trophic transfer and bioaccumulation of trace metals have a profound impact on the structure and function of coastal areas; however, the metal...  相似文献   
422.
Assessing the scope and severity of threats is necessary for evaluating impacts on populations to inform conservation planning. Quantitative threat assessment often requires monitoring programs that provide reliable data over relevant spatial and temporal scales, yet such programs can be difficult to justify until there is an apparent stressor. Leveraging efforts of wildlife management agencies to record winter counts of hibernating bats, we collated data for 5 species from over 200 sites across 27 U.S. states and 2 Canadian provinces from 1995 to 2018 to determine the impact of white-nose syndrome (WNS), a deadly disease of hibernating bats. We estimated declines of winter counts of bat colonies at sites where the invasive fungus that causes WNS (Pseudogymnoascus destructans) had been detected to assess the threat impact of WNS. Three species undergoing species status assessment by the U.S. Fish and Wildlife Service (Myotis septentrionalis, Myotis lucifugus, and Perimyotis subflavus) declined by more than 90%, which warrants classifying the severity of the WNS threat as extreme based on criteria used by NatureServe. The scope of the WNS threat as defined by NatureServe criteria was large (36% of Myotis lucifugus range) to pervasive (79% of Myotis septentrionalis range) for these species. Declines for 2 other species (Myotis sodalis and Eptesicus fuscus) were less severe but still qualified as moderate to serious based on NatureServe criteria. Data-sharing across jurisdictions provided a comprehensive evaluation of scope and severity of the threat of WNS and indicated regional differences that can inform response efforts at international, national, and state or provincial jurisdictions. We assessed the threat impact of an emerging infectious disease by uniting monitoring efforts across jurisdictional boundaries and demonstrated the importance of coordinated monitoring programs, such as the North American Bat Monitoring Program (NABat), for data-driven conservation assessments and planning.  相似文献   
423.
Environmental Science and Pollution Research - The effects of the COVID-19 lockdown on deposition and surface water chemistry were investigated in an area south of the Alps. Long-term data provided...  相似文献   
424.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号