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清道咸年间青海藏族回牧黄河北岸述论
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作者 益希汪秋 白珍 《西南民族大学学报(人文社会科学版)》 CSSCI 北大核心 1996年第6期87-91,共5页
清道咸年间,青海藏族又再次掀起第二次返牧河北的浪潮,清廷以血腥的手段屠杀过河的藏族各部,藏族各部经过艰苦卓绝的斗争,付出了极大的民族牺牲。
关键词 清道咸年间 青海藏族 回牧原住地
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温室内泡覆盖装置的开发 被引量:1
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作者 仓田勇 王容 《农业现代化研究》 1984年第5期59-59,共1页
温室必须完全具备昼间采光和夜间保温的性能,特别是在最近,从节能的观点出发,用什么方法使温室具有良好的保温性能,尤以引人注目。 为使温室具有良好的保温性,必须尽量减少温室表面(覆盖面)热量的散发。但目前实际的现状是,温室主要采... 温室必须完全具备昼间采光和夜间保温的性能,特别是在最近,从节能的观点出发,用什么方法使温室具有良好的保温性能,尤以引人注目。 为使温室具有良好的保温性,必须尽量减少温室表面(覆盖面)热量的散发。但目前实际的现状是,温室主要采用薄的覆盖材料进行多层覆盖,而这种多层覆盖,存在着每日早晚开闭作业,需要很多劳动力等问题。这里所研究的发泡覆盖装置,能大幅度提高温室的保温性能,并在操作上简便省力。 展开更多
关键词 温室 发泡装置 发泡机 保温性能 开闭 多层覆盖 流水槽 覆盖材料 喷雾机 回牧
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牧羊曲(版画)
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作者 杜应机 《当代文坛》 CSSCI 北大核心 1990年第2期66-66,共1页
关键词 版画 回牧
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Factors Influencing the Grazing Management Styles of Settled Herders: a Case Study of Nagqu County, Tibetan Plateau, China 被引量:5
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作者 HUA Xiao-bo YAN Jian-zhong +3 位作者 LIU Xiang WU Ying-ying LIU Lin-shan ZHANG Yi-li 《Journal of Mountain Science》 SCIE CSCD 2013年第6期1074-1084,共11页
The implementation of pasture contracting policies in the Tibetan Plateau has been of widespread concern in the scientific community and related government departments. Studying the effects of the implementation of pa... The implementation of pasture contracting policies in the Tibetan Plateau has been of widespread concern in the scientific community and related government departments. Studying the effects of the implementation of pasture contracting policies will help us understand herders' attitudes toward those policies and to amend existing policies effectively.This paper analyzes 135 herder families' grazing management behavior using participatory rural appraisal(PRA), quantitative analysis and a Logistic regression model in three townships of Nagqu County in remote areas of the Tibetan Plateau, China. The results show that the herders have become settled and are no longer nomadic, so the settlement project has basically been completed and the policy of contracting for grazing rights is being gradually implemented in Nagqu County. Since the grazing rights and pastures were under contract, group-based management has been widely accepted in this area, which helps the herders deal with constraints, such as limited pasture area, a small grazing radius, controlled family animal husbandry and an uneven distribution of water. The herders that have more family members available for labor, higher proportion of family members with good health, and higher income from animal husbandry tend to choose household-based management.Herders tend to choose group-based management when higher quality winter pastures are available. 展开更多
关键词 Pasture contract Nagqu County Settledherders Participatory rural appraisal Tibetan Plateau
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The Discount Rate in Terms of Evaluating Investments in Rangelands: The Case Study of Greece
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作者 Melina A Kourantidou Athanasios S. Christodoulou 《Journal of Environmental Science and Engineering(B)》 2012年第3期344-349,共6页
This paper aims at analyzing and evaluating investments in rangeland management through the use of the discount rate tool. The most important parameter which is considered when estimating the discount rate is the life... This paper aims at analyzing and evaluating investments in rangeland management through the use of the discount rate tool. The most important parameter which is considered when estimating the discount rate is the lifetime of the investment, which varies depending on the kind of the intervention. An undeniable characteristic of rangelands is their rich biodiversity. However, the fact that not all the flora and fauna has been recorded yet, suggests the need for using the lowest possible discount rate (but not zero), giving thus a high value on the benefits that will arise for future generations always in the light of sustainable development. At the same time, a sensitivity analysis has to be performed in order to determine the upper and lower limit of return on investment, so that the decision-maker in charge can be more flexible on the evaluation Of an investment proposal. 展开更多
关键词 Discount rate RANGELAND sustainable management.
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