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   9835篇
  免费   113篇
  国内免费   93篇
安全科学   283篇
废物处理   459篇
环保管理   1243篇
综合类   1193篇
基础理论   2667篇
环境理论   2篇
污染及防治   2771篇
评价与监测   708篇
社会与环境   667篇
灾害及防治   48篇
  2022年   100篇
  2021年   76篇
  2020年   65篇
  2019年   72篇
  2018年   145篇
  2017年   139篇
  2016年   229篇
  2015年   164篇
  2014年   237篇
  2013年   742篇
  2012年   296篇
  2011年   440篇
  2010年   362篇
  2009年   395篇
  2008年   470篇
  2007年   475篇
  2006年   422篇
  2005年   366篇
  2004年   323篇
  2003年   375篇
  2002年   324篇
  2001年   503篇
  2000年   331篇
  1999年   192篇
  1998年   137篇
  1997年   133篇
  1996年   138篇
  1995年   162篇
  1994年   125篇
  1993年   102篇
  1992年   123篇
  1991年   118篇
  1990年   130篇
  1989年   130篇
  1988年   94篇
  1987年   87篇
  1986年   65篇
  1985年   90篇
  1984年   89篇
  1983年   86篇
  1982年   82篇
  1981年   73篇
  1980年   61篇
  1979年   68篇
  1977年   53篇
  1976年   48篇
  1975年   53篇
  1974年   51篇
  1973年   53篇
  1970年   45篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
In spite of a worldwide reduction in the utilization of organochlorine pesticides (OCPs), they are still a problem for the aquatic environment and human health. The Black Sea is still being polluted with persistent chemicals, including OCPs. Aquatic organisms (sprat, scad, bluefish, shad, belted bonito, goby, and black mussel) with different feeding behaviours were sampled on a seasonal basis from the Bulgarian region of the Black Sea, and the concentrations of 13 OCP residues were determined. Although many of the OCPs were not detected in the samples, in all samples 1,1,1-trichloro-2,2-bis(4-chlorophenyl) ethane (DDT) was present mainly in the form of its metabolites 1,1-dichloro-2,2-bis(4-chlorophenyl) ethane (DDD) and 1,1-dichloro-2,2-bis(4-chlorophenyl) ethylene (DDE). Only about 12% of the total DDT was present as the parent compound pp-DDT, which suggests that it was not being used recently in the region. The total DDT concentrations were generally below 150 μg kg-1 fresh weight, but higher levels—up to 354 μg kg-1 fresh weight—were also measured for fish species with a high fat content. Between-species differences were observed, even when the concentrations were presented on a fat-level basis. DDT concentrations did not show any significant changes over the 2-yr sampling period. Fish sampled in the northern areas of the Bulgarian Black Sea coast seemed to contain higher DDT levels than those from the southern areas, suggesting a major (historical) influence of the Danube River. For permanent monitoring purposes, the utility of Black Sea gobies and scad should be considered.  相似文献   
5.
Abstract:  Broadly conceived and considered in its many usages, sustainability has grave defects as a planning goal, particularly when used by conservationists: it confuses means and ends; it is vague about what is being sustained and who or what is doing the sustaining; it is uninspiring; it is little more than Pinchot-era conservation (and thus ignores the many lessons learned since then); it need not be linked to land, to the land's functioning, or to any ecological science; it need not include a moral component; it is consistent with the view of humans as all-powerful manipulators of the planet; and, in general, it is such a malleable term that its popularity provides only a facade of consensus. When sustainability is defined broadly to include the full range of economic and social aspirations, it poses the particular risk that ecological and biodiversity concerns will be cast aside in favor of more pressing human wants. Given these many defects, the conservation movement should discard the term in favor of a more alluring goal, attentive to nature and its ecological functioning. A sound goal would incorporate and distill the considerable ecological and moral wisdom accumulated since Pinchot's day while giving conservationists the rhetorical tools needed to defend the land against competing pressures. In our view, conservation would be well served by an updated variant of "land health," Aldo Leopold's ecologically grounded goal from the 1940s. Land health as an independent understanding should set the essential terms of how we live and enjoy the earth, providing the framework within which we pursue our many social and economic aims.  相似文献   
6.
7.
8.
9.
10.
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