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   19649篇
  免费   305篇
  国内免费   409篇
安全科学   724篇
废物处理   946篇
环保管理   2883篇
综合类   3218篇
基础理论   4871篇
环境理论   8篇
污染及防治   5300篇
评价与监测   1184篇
社会与环境   1087篇
灾害及防治   142篇
  2023年   96篇
  2022年   195篇
  2021年   200篇
  2020年   193篇
  2019年   181篇
  2018年   352篇
  2017年   318篇
  2016年   482篇
  2015年   373篇
  2014年   518篇
  2013年   1581篇
  2012年   733篇
  2011年   1024篇
  2010年   759篇
  2009年   886篇
  2008年   959篇
  2007年   1013篇
  2006年   843篇
  2005年   714篇
  2004年   723篇
  2003年   660篇
  2002年   626篇
  2001年   695篇
  2000年   549篇
  1999年   338篇
  1998年   228篇
  1997年   251篇
  1996年   238篇
  1995年   283篇
  1994年   227篇
  1993年   225篇
  1992年   185篇
  1991年   198篇
  1990年   189篇
  1989年   190篇
  1988年   160篇
  1987年   141篇
  1986年   164篇
  1985年   151篇
  1984年   197篇
  1983年   157篇
  1982年   178篇
  1981年   164篇
  1980年   139篇
  1979年   152篇
  1978年   99篇
  1977年   100篇
  1974年   97篇
  1973年   90篇
  1972年   101篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Conservation conflicts are gaining importance in contemporary conservation scholarship such that conservation may have entered a conflict hype. We attempted to uncover and deconstruct the normative assumptions behind such studies by raising several questions: what are conservation conflicts, what justifies the attention they receive, do conservation-conflict studies limit wildlife conservation, is scientific knowledge stacked against wildlife in conservation conflicts, do conservation-conflict studies adopt a specific view of democracy, can laws be used to force conservation outcomes, why is flexibility needed in managing conservation conflicts, can conservation conflicts be managed by promoting tolerance, and who needs to compromise in conservation conflicts? We suggest that many of the intellectual premises in the field may defang conservation and prevent it from truly addressing the current conservation crisis as it accelerates. By framing conservation conflicts as conflicts between people about wildlife or nature, the field insidiously transfers guilt, whereby human activities are no longer blamed for causing species decline and extinctions but conservation is instead blamed for causing social conflicts. When the focus is on mitigating social conflicts without limiting in any powerful way human activities damaging to nature, conservation-conflict studies risk keeping conservation within the limits of human activities, instead of keeping human activities within the limits of nature. For conservation to successfully stop the biodiversity crisis, we suggest the alternative goal of recognizing nature's right to existence to maintenance of ecological functions and evolutionary processes. Nature being a rights bearer or legal person would imply its needs must be explicitly taken into account in conflict adjudication. If, even in conservation, nature's interests come second to human interests, it may be no surprise that conservation cannot succeed.  相似文献   
3.
Journal of Material Cycles and Waste Management - Owing to various advantages of artificial marble compared to natural marble, its application has been rising exponentially, which has resulted in...  相似文献   
4.
5.
6.
7.
8.
9.
Abstract:  Introduction of artificial light into wildlife habitat represents a rapidly expanding form of human encroachment, particularly in coastal systems. Light pollution alters the behavior of sea turtles during nesting; therefore, long-wavelength lights—low-pressure sodium vapor and bug lights—that minimize impacts on turtles are required for beach lighting in Florida (U.S.A.). We investigated the effects of these two kinds of lights on the foraging behavior of Santa Rosa beach mice (  Peromyscus polionotus leucocephalus ). We compared patch use and giving-up densities of mice for experimental food patches established along a gradient of artificial light in the field. Mice exploited fewer food patches near both types of artificial light than in areas with little light and harvested fewer seeds within patches near bug lights. Our results show that artificial light affects the behavior of terrestrial species in coastal areas and that light pollution deserves greater consideration in conservation planning.  相似文献   
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