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   109篇
  免费   8篇
  2023年   1篇
  2019年   4篇
  2018年   5篇
  2017年   4篇
  2016年   3篇
  2015年   1篇
  2014年   1篇
  2013年   4篇
  2012年   4篇
  2011年   5篇
  2010年   3篇
  2009年   3篇
  2008年   2篇
  2007年   1篇
  2006年   7篇
  2005年   5篇
  2004年   6篇
  2003年   4篇
  2002年   5篇
  2001年   1篇
  2000年   1篇
  1999年   1篇
  1998年   4篇
  1997年   4篇
  1996年   7篇
  1995年   5篇
  1994年   7篇
  1993年   7篇
  1992年   3篇
  1991年   1篇
  1988年   1篇
  1982年   1篇
  1981年   1篇
  1980年   1篇
  1979年   2篇
  1978年   1篇
  1977年   1篇
排序方式: 共有117条查询结果,搜索用时 46 毫秒
21.
22.
23.
24.
ABSTRACT

We integrate functional weed ecology with crop stable carbon and nitrogen isotope analysis to assess their combined potential for inferring arable land management practices in (semi-)arid regions from archaeobotanical assemblages. Weed and GIS survey of 60 cereal and pulse fields in Morocco are combined with crop sampling for stable isotope analysis to frame assessment of agricultural labour intensity in terms of manuring, irrigation, tillage and hand-weeding. Under low management intensity weed variation primarily reflects geographical differences, whereas under high management intensity fields in disparate regions have similar weed flora. Manured and irrigated oasis barley fields are clearly discriminated from less intensively manured rain-fed barley terraces in southern Morocco; when fields in northern and southern Morocco are considered together, climatic differences are superimposed on the agronomic intensity gradient. Barley δ13C and δ15N values clearly distinguish among the Moroccan regimes. An integrated approach combines crop isotope values with weed ecological discrimination of low- and high-intensity regimes across multiple studies (in southern Morocco and southern Europe). Analysis of archaeobotanical samples from EBA Tell Brak, Syria suggests that this early city was sustained through extensive (low-intensity, large-scale) cereal farming.  相似文献   
25.
26.
Book reviewed in this article: The Kuwait Petroleum Corporation and the Economics of the New World Order: Mary Ann Tétreault The Iraqi Aggression Against Kuwait: Strategic Lessons and Implications for Europe: Wolfgang F. Danspeckgruber and Charles R. H. Tripp, editors  相似文献   
27.
28.
29.
In September 2014, the University of New England (UNE), Australia, began a three‐year programme of archaeological fieldwork and post‐excavation analyses focused on the site of Saruq al‐Hadid. In this paper, we present the initial results of our current field and laboratory research particularly related to site stratigraphy and formation processes, relative and absolute chronology, and the preliminary results of various programmes of post‐excavation analyses including archaeobotanical, zooarchaeological, ceramic and archaeometallurgical studies. These studies provide new data to build into the archaeological understanding of Saruq al‐Hadid that has, to date, focused largely on intensive excavation.  相似文献   
30.
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