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   21938篇
  免费   232篇
  国内免费   663篇
安全科学   548篇
废物处理   965篇
环保管理   2428篇
综合类   4842篇
基础理论   5212篇
环境理论   6篇
污染及防治   5469篇
评价与监测   1592篇
社会与环境   1621篇
灾害及防治   150篇
  2023年   134篇
  2022年   286篇
  2021年   229篇
  2020年   165篇
  2019年   220篇
  2018年   356篇
  2017年   381篇
  2016年   523篇
  2015年   405篇
  2014年   671篇
  2013年   1675篇
  2012年   748篇
  2011年   964篇
  2010年   780篇
  2009年   861篇
  2008年   941篇
  2007年   953篇
  2006年   823篇
  2005年   752篇
  2004年   716篇
  2003年   711篇
  2002年   689篇
  2001年   891篇
  2000年   579篇
  1999年   385篇
  1998年   257篇
  1997年   253篇
  1996年   279篇
  1995年   318篇
  1994年   268篇
  1993年   215篇
  1992年   238篇
  1991年   250篇
  1990年   238篇
  1989年   207篇
  1988年   220篇
  1987年   163篇
  1986年   178篇
  1985年   188篇
  1984年   181篇
  1983年   167篇
  1982年   172篇
  1981年   182篇
  1980年   126篇
  1979年   136篇
  1978年   130篇
  1976年   123篇
  1974年   134篇
  1972年   135篇
  1967年   126篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
112.
113.
114.
115.
Mitigation and adaptation synergy in forest sector   总被引:1,自引:1,他引:1  
Mitigation and adaptation are the two main strategies to address climate change. Mitigation and adaptation have been considered separately in the global negotiations as well as literature. There is a realization on the need to explore and promote synergy between mitigation and adaptation while addressing climate change. In this paper, an attempt is made to explore the synergy between mitigation and adaptation by considering forest sector, which on the one hand is projected to be adversely impacted under the projected climate change scenarios and on the other provide opportunities to mitigate climate change. Thus, the potential and need for incorporating adaptation strategies and practices in mitigation projects is presented with a few examples. Firstly, there is a need to ensure that mitigation programs or projects do not increase the vulnerability of forest ecosystems and plantations. Secondly, several adaptation practices could be incorporated into mitigation projects to reduce vulnerability. Further, many of the mitigation projects indeed reduce vulnerability and promote adaptation, for example; forest and biodiversity conservation, protected area management and sustainable forestry. Also, many adaptation options such as urban forestry, soil and water conservation and drought resistant varieties also contribute to mitigation of climate change. Thus, there is need for research and field demonstration of synergy between mitigation and adaptation, so that the cost of addressing climate change impacts can be reduced and co-benefits increased.  相似文献   
116.
117.
Population differences in anti-predator behaviour have been demonstrated in several species, although less is known about the genetic basis of these traits. To determine the extent of genetic differences in boldness (defined as exploration of a novel object) and shoaling within and between zebrafish (Danio rerio) populations, and to examine the genetic basis of shoaling behaviour in general, we carried out a study that involved laboratory-raised fish derived from four wild-caught populations. Controlling for differences in rearing environment, significant inter-population differences were found in boldness but not shoaling. A larger shoaling experiment was also performed using one of the populations as the basis of a North Carolina type II breeding design (174 fish in total) to estimate heritability of shoaling tendency. A narrow-sense heritability estimate of 0.40 was obtained, with no apparent dominance effects.  相似文献   
118.
119.
120.
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