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   29550篇
  免费   335篇
  国内免费   253篇
安全科学   856篇
废物处理   1121篇
环保管理   4120篇
综合类   5157篇
基础理论   7770篇
环境理论   14篇
污染及防治   7439篇
评价与监测   1809篇
社会与环境   1642篇
灾害及防治   210篇
  2022年   218篇
  2021年   229篇
  2020年   201篇
  2019年   257篇
  2018年   394篇
  2017年   420篇
  2016年   618篇
  2015年   484篇
  2014年   673篇
  2013年   2387篇
  2012年   831篇
  2011年   1164篇
  2010年   953篇
  2009年   1009篇
  2008年   1195篇
  2007年   1249篇
  2006年   1159篇
  2005年   917篇
  2004年   976篇
  2003年   916篇
  2002年   847篇
  2001年   1128篇
  2000年   803篇
  1999年   477篇
  1998年   404篇
  1997年   368篇
  1996年   402篇
  1995年   426篇
  1994年   438篇
  1993年   389篇
  1992年   413篇
  1991年   387篇
  1990年   414篇
  1989年   380篇
  1988年   316篇
  1987年   278篇
  1986年   289篇
  1985年   299篇
  1984年   320篇
  1983年   313篇
  1982年   312篇
  1981年   314篇
  1980年   267篇
  1979年   268篇
  1978年   215篇
  1977年   210篇
  1975年   182篇
  1974年   210篇
  1973年   187篇
  1972年   221篇
排序方式: 共有10000条查询结果,搜索用时 53 毫秒
931.
Gene E. Likens 《Ambio》2021,50(2):278
Early studies published in Ambio showed large-scale acidification of lakes in southern Sweden and Norway from acid rain. These studies were important for delimiting various scientific issues and thus for eventually contributing to legislation, which reduced emissions of sulfur dioxide and nitrogen oxides and helped to mitigate this major environmental problem. Long-term studies and monitoring in Sweden and Norway and at Hubbard Brook Experimental Forest in New Hampshire helped guide this legislation in Europe and in the USA.  相似文献   
932.
Concerns over the loss of biodiversity and ecosystem services in farmland have prompted the development of agri-environment policy measures aimed at reducing farming pressure and maintaining semi-natural habitats in farmed landscapes. However, further knowledge is needed to guarantee successful agri-environment measures implementation. The current study assessed the quantity and the quality of semi-natural habitats in farms across a gradient of farming intensities in two contrasting regions in Ireland. Policy protection seemed fundamental for semi-natural habitats preservation. Habitats not protected by agricultural policy relied on extensive farming and are in danger of disappearing if they are intensified or abandoned. Due to the lack of policy incentives for habitat quality, no correlations were found between farming intensity and share of semi-natural habitats with habitat quality. Therefore, extensive farming and retention of habitats alone may not reverse the decline of farmland quality and biodiverisity and, thus, measures incentivising the environmental quality may be more successful.Electronic supplementary materialThe online version of this article (10.1007/s13280-020-01344-6) contains supplementary material, which is available to authorized users.  相似文献   
933.
Environmental Science and Pollution Research - Increasing urbanization and anthropogenic activities of the last couple of decades have left significant amounts of plastic debris in both coastal and...  相似文献   
934.
Environmental Science and Pollution Research - Environmental arsenic exposure in adults and children has been associated with a reduction in the expression of club cell secretory protein (CC16) and...  相似文献   
935.
Collaborative monitoring over broad scales and levels of ecological organization can inform conservation efforts necessary to address the contemporary biodiversity crisis. An important challenge to collaborative monitoring is motivating local engagement with enough buy-in from stakeholders while providing adequate top-down direction for scientific rigor, quality control, and coordination. Collaborative monitoring must reconcile this inherent tension between top-down control and bottom-up engagement. Highly mobile and cryptic taxa, such as bats, present a particularly acute challenge. Given their scale of movement, complex life histories, and rapidly expanding threats, understanding population trends of bats requires coordinated broad-scale collaborative monitoring. The North American Bat Monitoring Program (NABat) reconciles top-down, bottom-up tension with a hierarchical master sample survey design, integrated data analysis, dynamic data curation, regional monitoring hubs, and knowledge delivery through web-based infrastructure. NABat supports collaborative monitoring across spatial and organizational scales and the full annual lifecycle of bats.  相似文献   
936.
937.
Environmental Science and Pollution Research - The aim of the study was to determine if gold-mining activities could impact the mercury (Hg) concentrations and isotopic signatures in freshwater...  相似文献   
938.
Environmental Science and Pollution Research - Potentially toxic elements (PTEs) are of great concern in steel mill wastes. Therefore, in order to use them as potential fertilizers in soil, risk...  相似文献   
939.
Environmental Science and Pollution Research - On-site small-scale sanitation is common in rural areas and areas without infrastructure, but the treatment of the collected fecal matter can be...  相似文献   
940.
Environmental Science and Pollution Research - There has been alarming depletion of manganese (Mn) reserves owing to the ongoing extensive mining operations for catering the massive industrial...  相似文献   
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