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   255篇
  免费   20篇
  国内免费   5篇
林业   40篇
农学   17篇
基础科学   9篇
  29篇
综合类   99篇
农作物   6篇
水产渔业   16篇
畜牧兽医   51篇
园艺   4篇
植物保护   9篇
  2024年   4篇
  2023年   6篇
  2022年   9篇
  2021年   11篇
  2020年   11篇
  2019年   10篇
  2018年   6篇
  2017年   17篇
  2016年   12篇
  2015年   9篇
  2014年   10篇
  2013年   19篇
  2012年   8篇
  2011年   24篇
  2010年   16篇
  2009年   15篇
  2008年   21篇
  2007年   19篇
  2006年   19篇
  2005年   8篇
  2004年   3篇
  2003年   7篇
  2002年   4篇
  2001年   3篇
  2000年   2篇
  1998年   2篇
  1997年   1篇
  1996年   1篇
  1994年   1篇
  1993年   1篇
  1991年   1篇
排序方式: 共有280条查询结果,搜索用时 15 毫秒
161.
太白山自然保护区周边社区群众保护观念和态度取向调查   总被引:2,自引:0,他引:2  
通过对陕西太白山自然保护区周边群众进行随机问卷调查以及半结构访谈,对收集到的资料经过Logistic二项回归方法分析,结果显示:保护区周边群众性别和文化程度是影响其观念和态度取向的最重要方面,其总体趋势是积极态度占主导地位,也发现了许多冲突和矛盾问题.对保护区与周边社区和谐发展提出了相应的建议和措施.  相似文献   
162.
Contests over scarce and shared natural resources continue to headline conflicts across the world’s geographic regions. The transfrontier conservation areas (TFCAs) concept gained widespread acceptance as one of the promising conflict management strategies. However, following the establishment of TFCAs by various countries, questions about their contribution to conflict management and resolution are emerging. Motivated by the institutional work concept, the contribution of TFCAs and their institutional framework for peace and cooperation efforts was assessed. Using field experience and the archival method, 131 journal articles, books and reports on natural resources and conflict management were reviewed between 2010 and 2016. The review process focused mainly, but not limited to TFCAs and their institutional frameworks in the Southern African Development Community (SADC). Findings indicate that TFCAs and their institutional frameworks are relevant to peace and cooperation efforts in SADC provided the stakeholders at various levels are committed to the actions agreed upon. However, making conclusive statements without further comprehensive studies on the contribution of other peace-promoting interventions within the SADC region besides TFCAs may be ill conceived. Governments and other key stakeholders are recommended to further harmonize conservation legislation, institutions and management practices to promote cooperation at the local and regional level.  相似文献   
163.
Predation of livestock by wildlife and the retribution responses it elicits can have strong negative impacts on both people and carnivores. A questionnaire survey designed to investigate human-carnivore conflicts was completed by 66 herders from local communities within Taxkorgan Nature Reserve, located in the Pamir and Karkorum mountains of Northwestern China. A total of 127 livestock predation events with associated predator identification were reported and 583 livestock were killed. Wolves (315 livestock) and dholes (129 livestock) were responsible for the largest number of livestock losses. Livestock depredation significantly differed between guarded and unguarded management strategies. Positive relationships between loss and the total amount of the major livestock species, as well as the total loss and total amount of livestock, were detected. Use of guard dogs did not affect the likelihood of carnivore attacks, whereas keeping livestock in pens at night or all day did reduce the number of depredation events. Depredation showed significant seasonal variation (month of occurrence) for large carnivores. Numbers of goat, sheep, and cattle predated also varied by month, but did not for yak because of different husbandry practices. No compensation policy has yet been established in this area, but if it were to be developed in the future, 83% of interviewed herders would require compensation in cash, whereas 14% of herders would prefer replacement livestock. Our study offers suggestions to mitigate livestock depredation in this region of China. To prevent livestock depredations, local herders should mainly prevent wolves and dholes because they cause most livestock killings, and employ guarded grazing practice. Managers could make herders keep a reasonable number of livestock to raise grazing efficiency, introduce suitable sheepdog breeds, and provide essential dog training as useful aids to herders to increase livestock-guarding effectiveness.  相似文献   
164.
运用委托代理理论模型对农产品渠道依赖和渠道冲突之间的关系进行了研究。结果表明:渠道双方的相互依赖能降低渠道冲突,可以采用专有资产的投资等方式来提高渠道成员的相互依赖度。  相似文献   
165.
中国亚洲象与人类关系   总被引:1,自引:0,他引:1  
对中国亚洲象的历史性南移、分布现状、亚洲象分布与人口密度的关系、因人象生境之争而形成的日益严重的人象冲突、亚洲象的保护现状等方面进行了论述,提出了对亚洲象保护的管理建议。  相似文献   
166.
167.
Human–wildlife conflict (HWC) presents an increasing challenge to conservation, particularly in densely populated parts of low-income countries. This article assessed one form of conflict, crop raiding by forest-dwelling primates, along the boundary of a tropical montane forest fragment (Gishwati Forest) in western Rwanda. Variation in species involved, crops affected, differences in magnitude with season and distance to the forest boundary, and the nature of mitigation efforts were assessed through semi-structured interviews with farmers and field-based observations during June and July 2009. Substantial losses of crops were reported, with replacement costs possibly reaching 10–20% of total household income. Chimpanzees (Pan troglodytes) and Cercopithecus monkeys were the sole reported raiders, mainly affecting maize and legumes. Mitigation was restricted to guarding of crops and modification of farming practices, the latter potentially having significant dietary consequences for subsistence farmers. These findings highlight the potentially high economic costs, and food security effects of HWC.  相似文献   
168.
Much of the history of the human–shark relationship has been based on fear. For centuries, the goal has been to kill sharks that come near boats or beaches. Yet, there is a growing trend of more positive feelings toward local shark populations. In this article, we demonstrate that feelings of pride toward sharks can serve as an opposing force to fear, and can moderate the way fear affects support for policies to kill sharks. This study reports on two surveys of pride toward sharks from Eastern and Western Australia. These highlight a new and emerging story for people and sharks. We argue that the combination of shifts in the understanding of sharks’ motives during human–shark interactions and higher levels of pride support a new political dynamic in which the public prefers nonlethal responses to shark bites in support of a burgeoning “save the sharks” movement.  相似文献   
169.
儒道的对峙与冲突是历代历朝都不少见的社会现象。虽然起初它仅仅是一种教派争锋,但随着历史的演变,它却已明显地超出了这一范围,而是体现在政治、经济、文化等社会生活的各个方面。这反映了一个民族思想的不断传承与发展,也代表了不同时代不同群体的生活表征。无一例外,文学作品中也常常会表现儒道冲突的现象或主题,而《红楼梦》则是其中比较经典的作品之一。  相似文献   
170.
Inter‐group conflicts are common among many group‐living animals and involve potentially complex motivations and interactions. Mammals living in multilevel societies offer a good opportunity to study inter‐group conflicts. This study is the first to explore the function of sex‐specific participation during inter‐group conflicts within a multilevel society at the individual level. The Sichuan snub‐nosed monkey (Rhinopithecus roxellana) is an endangered seasonal breeding species living in a multilevel society. From Sep 2007 to May 2008 we recorded 290 inter‐group conflicts of a free‐ranging provisioned band of R. roxellana in the Qinling Mountains of China to investigate the function of individual aggression during inter‐group encounters. Our findings show that adult males were the main participants in inter‐group conflicts, while females took part in them only occasionally. The male participation rate during the mating season, when adult females were estrous, was significantly higher than that during the non‐mating season. Furthermore, males directed their aggression to other males, and directed more intense aggression towards bachelor males than towards other resident males. For both sexes, the participation rate as initiators was higher in the winter than that in the spring; and there was a significant positive correlation between group size and the participation rate as initiators. Our results suggest that inter‐group aggression in Sichuan snub‐nosed monkeys is linked to both mate defense and resource defense.  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