维普中文期刊产品整合服务
6篇 您的检索式:作者名="Stevan Harrell"
    题名 作者 年代 出处 被引量
1Reforestation Programs in Southwest China:Reported Success,Observed Failure, and the Reasons Why显示文摘Ever since the disastrous floods of 1998, the Chinese government has used the Natural Forest Protection and Sloping Land Conversion Programs to promote afforestation and reforestation as means to reduce runoff, control erosion, and stabilize local livelihoods. These two ambitious programs have been reported as large-scale successes, contributing to an overall increase in China’s forest cover and to the stated goals of environmental stabilization. A small-scale field study at the project level of the implementation of these two programs in Baiwu Township, Yanyuan County, Sichuan, casts doubt upon the accuracy and reliability of these claims of success; ground observations revealed utter failure in some sites and only marginal success in others. Reasons for this discrepancy are posited as involving ecological, economic, and bureaucratic factors. Further research is suggested to determine whether these discrepancies are merely local aberrations or represent larger-scale failures in reforestation programs.Christine Jane Trac Stevan Harrell Thomas M. Hinckley Amanda C. Henck 2007Journal of Mountain Science2007,4,4:13
2显示文摘Harrell Stevan&Sara Dickey “Dowry Systems in Complex Society 1985In Ethnology1985,,24:1
3Theconcept offate in Chinese folkideology显示文摘Harrell Stevan 1987Modern China1987,13,1:1
4The Anthropology of Reform and the Reform of Anthropology:Anthropological Narratives of Recovery and Progress in China显示文摘Stevan Harrell 2001Annual Review of An-thropology2001,30,:1
5Ethnicity, local interests, and the state: Yi communities in southwest China 显示文摘Stevan Harrell 1990in Comparative Studies in Society and History1990,,:1
6Influence of Human Pressure on Forest Resources and Productivity at Stand and Tree Scales: The Case Study of Yunnan Pine in SW China显示文摘This paper examines human impact on stands and individual trees of Pinus yunnanensis growing near the small mountain villages of Pianshui and Yangjuan in southwestern Sichuan Province,China.In an effort to assess whether use of these forests was sustainable,we examined the effects of human use in two ways.First,we directly measured the effect of cutting branches,for fuel and fodder,on tree growth.We hypothesized that branch cutting would negatively impact tree growth.We established 12 plots on four hills and compared 14 pairs of trees,one tree in each pair with an apparently full crown and the other with a considerable portion of the crown removed.Second,we assessed stand and tree properties over a 500 m elevation gradient above the villages where we hypothesized that as elevation increases,stand and tree properties should show fewer human impacts.Although extensive branch cutting reduced the live crown,tree height and diameter,compensatory processes likely enabled trees to recover and to add basal area increments(BAIs) similar to those added by trees with full crowns.Trees and stands close to villages showed less growth and lower basal areas,respectively,than stands and trees at intermediate or distant elevations from villages.Areas relatively close to the villages showed considerable effects of human-related disturbances such as branch cutting,grazing,tree and shrub removal,losses of litter,and human and animal trails.Such areas had increased soil erosion and often loss of the ‘A' horizon.Stands close to villages had younger trees,lower stand basal areas,smaller basal area increments,and more stumps.Our results suggest an increasingly vulnerable interface between occupants of these two villages and their surrounding forests.Thomas M.HINCKLEY Phillip CHI Keala HAGMANN Stevan HARRELL Amanda Henck SCHMIDT Lauren URGENSON Zong-yong ZENG 2013Journal of Mountain Science2013,10,5:0
返回顶部 每页显示:
共1页 首页 上一页 第1页 下一页 末页 /1 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费