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Regulation or Property Rights: The Effect of China's Coal Mine Shutdown Policy on Work Safety
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作者 白重恩 王鑫 钟笑寒 《China Economist》 2012年第3期114-127,共14页
关键词 财产权利 煤矿安全 安全生产 关闭 中国 规例 死亡率 产业政策
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Timberland Investing and Private Property Rights in the United States of America
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作者 Caroline Harris Tom Harris Jacek Siry 《Open Journal of Forestry》 2020年第4期428-444,共17页
Investments in rural land for agriculture, timber, and other natural resource purposes occur frequently and globally. Fundamental principles of liberty and property found in the United States of America’s (“US”) le... Investments in rural land for agriculture, timber, and other natural resource purposes occur frequently and globally. Fundamental principles of liberty and property found in the United States of America’s (“US”) legal system, from its origins to recent US Supreme Court decisions, continue to positively benefit holders of real estate in the Southern US, through a deep-rooted public policy of supporting private property rights and rural economic development. This stable rule of law enhances the long-term adaptability and sustainability of timberland as an asset class. This article is a commentary. It combines legal research methodology with the observations and conclusions of the authors. Its purpose is to demonstrate that the existence of alienable, documentable ownership, and related property rights create inherent stability and security. These principles form the basis of a culture that is defined by the rule of law and is “open for business.” This business mindset is particularly prevalent in the Southern US. 展开更多
关键词 forest Economics property Law property rights Private Land Ownership History of forestry Alternative Asset Classes Premises Liability Recreational Land Use Business Law Capital Use Real Estate Title Rule of Law United States Constitutional Law Legal History
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Intellectual Property Protection,Inheritance,Innovation and Development of Woody Edible Oilseeds in Hubei Province 被引量:4
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作者 Li GAO Yuanpeng SUN +2 位作者 Jianjun ZHANG Jin ZENG Zhiguo SUN 《Asian Agricultural Research》 2023年第11期6-14,共9页
Only by developing woody edible oilseeds industry can we ensure the safety of the important industrial chain and supply chain of vegetable edible oil in China.There are 13 kinds of woody edible oil plants in Hubei,inc... Only by developing woody edible oilseeds industry can we ensure the safety of the important industrial chain and supply chain of vegetable edible oil in China.There are 13 kinds of woody edible oil plants in Hubei,including Camellia oleifera Abel(oil tea),Juglans regia L.(walnut),Olea europaea L.(olive)and Paeonia suffruticosa(oil peony).This paper studies the main industries of woody edible oilseeds in Hubei Province and their intellectual property resources,and analyzes the main problems in their intellectual property protection,inheritance,innovation and development.Finally,it proposes some strategies,including carrying forward the traditional knowledge related to woody edible oilseeds,innovating the"agricultural chip",creating key counties of national woody edible oil seeds,and developing industrial clusters with national advantages and characteristics. 展开更多
关键词 Woody edible oilseeds Vegetable edible oil Grain and oil safety Big food concept Intellectual property rights Hubei Province
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Survey on the Peasants' Will of Forest Land Transfer in the Reform of Collective Forest Right System——On the Case of 180 Peasant Households in Lishui City of Zhejiang Province 被引量:8
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作者 LI Zhi 《Asian Agricultural Research》 2011年第10期19-21,25,共4页
Taking sample survey in the eighteen villages of Yunhe, Longquan and Qingyuan County of Lishui City of Zhejiang Province, the results show that the forest land transfer of sample peasants is mainly transfer-out, the p... Taking sample survey in the eighteen villages of Yunhe, Longquan and Qingyuan County of Lishui City of Zhejiang Province, the results show that the forest land transfer of sample peasants is mainly transfer-out, the private treaty of forest land transfer is the main pattern of most peasant households, forest right trading market hasn't got wide approval in peasants, peasants' dependence on land is reducing, and so on. Through analysis, the reasons of influent transfer of forest land include peasant's subjective will, less type of transfer objects, dull information communication, big difference of expected price and imperfect development of intermediary organization. In order to promote a healthy development of forest land transfer, the paper puts forward proposals of strengthening policy publicity, improving system, identifying property right, pushing variety of transfer types, developing forest land market, cultivating subject of market and so on. 展开更多
关键词 REFORM of forest RIGHT system TRANSFER of forest l
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Property Rights, Institutions and Forest Resources Management in Developing Countries
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作者 Djiby Racine Thiam 《Natural Resources》 2014年第4期107-118,共12页
The objective of this paper is to propose a conceptual framework stimulating the sustainable management of natural resources in Central Africa. Based on the forest resources, we show how good identification and alloca... The objective of this paper is to propose a conceptual framework stimulating the sustainable management of natural resources in Central Africa. Based on the forest resources, we show how good identification and allocation of property rights strengthen the joint management of forest resources. Cameroon is selected as an example, since the country represents one of the most forest-intense areas in Africa. In doing so, we first evaluate the performance of institutions in fostering sustainable forest management. Second we show how good elaboration and allocation of property rights may contribute to improving efficiency in forest management. Using the New Institutional Economic (NIE) theory we provide an outline of the potential relationships between forest management and property rights allocated to stakeholders involved in forest exploitation. Finally we provide two forms of institutional structures that could improve forest management efficiency: public-private partnership and multi-stakeholder management approaches. Public-private partnerships are joint project management processes operated by both private businesses and public entities in order to combine public prescriptive mechanisms with private operational roles. Multi-stakeholder management approach is also a co-management initiative combining public entities, private actors and local population to increase the involvement of local dwellers living in forest areas in the decision process. 展开更多
关键词 Natural Resources forest Cameroon New INSTITUTIONAL ECONOMICS property rights Joint forest Management
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Rape Breeding and Its Intellectual Property Protection in China 被引量:6
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作者 Li GAO Leying WU +3 位作者 Yamin PENG Yuanpeng SUN Jin ZENG Zhiguo SUN 《Agricultural Biotechnology》 CAS 2023年第3期23-30,共8页
Rape is the third largest oil crop in the world and the first one in China.The national average rapeseed yield is only 2077.5 kg/hm^(2),and the rapeseed oil yield is 894 kg/hm^(2).This paper introduced the main types,... Rape is the third largest oil crop in the world and the first one in China.The national average rapeseed yield is only 2077.5 kg/hm^(2),and the rapeseed oil yield is 894 kg/hm^(2).This paper introduced the main types,germplasm resources,breeding bases and breeding progress of Chinese rape,and studied its high-quality varieties,breeding patents and new varieties of agricultural plants.We analyzed the main problems such as serious loss of germplasm resources in Brassica campestris L.and Brassica juncea(L.)Czern.et Coss and weak"agricultural chip"in rape field,and put forward strategies such as strengthening the protection of rape germplasm resources,encouraging the development of"agricultural chip"in rape industry clusters with national advantages and characteristics,and strengthening the protection of agricultural intellectual property rights. 展开更多
关键词 RAPE RAPESEED Rape breeding Intellectual property rights Edible oil supply safety China
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习近平关于集体林权制度改革重要论述的生成逻辑、实践指向及价值意蕴
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作者 黄登良 罗贤宇 +1 位作者 朱逸涵 戴永务 《林业经济问题》 北大核心 2024年第1期6-14,共9页
基于马克思主义产权理论、中国共产党领导的百年林业改革发展经验和新时代推进林业高质量发展的现实需要等3个层面分析习近平关于集体林权制度改革重要论述的生成逻辑。准确把握习近平关于集体林权制度改革重要论述的鲜明实践指向:坚持... 基于马克思主义产权理论、中国共产党领导的百年林业改革发展经验和新时代推进林业高质量发展的现实需要等3个层面分析习近平关于集体林权制度改革重要论述的生成逻辑。准确把握习近平关于集体林权制度改革重要论述的鲜明实践指向:坚持正确改革方向、坚持生态美与百姓富的有机统一、坚持人民主体地位、坚持问题导向、坚持顶层设计和基层探索相统一。总结习近平关于集体林权制度改革重要论述的价值意蕴:有利于为切实改善民生福祉、推进林业生态文明建设提供理论指导,同时为全球林业发展贡献中国智慧和中国方案。 展开更多
关键词 集体林权制度改革 生态文明建设 林业高质量发展
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Forest Tenure and Sustainable Forest Management
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作者 Jacek P. Siry Kathleen McGinley +1 位作者 Frederick W. Cubbage Pete Bettinger 《Open Journal of Forestry》 2015年第5期526-545,共20页
We reviewed the principles and key literature related to forest tenure and sustainable forest management, and then examined the status of sustainable forestry and land ownership at the aggregate national level for maj... We reviewed the principles and key literature related to forest tenure and sustainable forest management, and then examined the status of sustainable forestry and land ownership at the aggregate national level for major forested countries. The institutional design principles suggested by Ostrom are well accepted for applications to public, communal, and private lands. The analyses of countries as a whole suggest that problems of forest land loss and sustainable forest management are related to the amount of public lands owned, as well as the difference between developed and developing countries. Developed countries have largely achieved a stable level of land use and resource extraction after centuries of exploitation of forests and natural resources. Many developed countries do have greater amounts of private forest land than developing countries, which have occurred as the countries transfer lands to private owners in the course of development. Public lands and management approaches require diligence, but can be developed to meet the design criteria suggested by tenure rights theorists. Private or communal ownership is often considered superior, but also must meet the criteria suggested above in order to foster sustainable forest management in poor countries. 展开更多
关键词 forest TENURE property rights SUSTAINABLE forest MANAGEMENT
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Combining Geomatics and Conventional Methods for Monitoring Forest Conditions under Different Governance Arrangements
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作者 Ambika P. Gautam 《Journal of Mountain Science》 SCIE CSCD 2006年第4期325-333,共9页
This study employed an innovative meth- odological framework that combines geomatics and conventional survey methods to monitor changes in forest conditions and examine their associations with local forest governance ... This study employed an innovative meth- odological framework that combines geomatics and conventional survey methods to monitor changes in forest conditions and examine their associations with local forest governance parameters in a mountain watershed covering 153.3 km2 in the middle moun- tains of Nepal. The study involved two spatial scales and analytical steps. First, geomatics techniques were used to map and detect changes in major land cover types in the watershed between 1976 and 2000 and to analyze relationships between forest cover changes and governance arrangements. This was followed by micro-level analysis of the relationships between the biological conditions of selected forests within the watershed and their governance arrangements, using conventional survey methods and analytical tools. The findings show that forest cover in the watershed in- creased by about 15 per cent during the period. The rate of increase in forest cover was highest in areas under a semi-government type of governance ar- rangement, while the community forests were gener- ally better in terms of current biological conditions compared to the semi-government forests. This in- consistency between the findings from the two analy- ses does not allow us to draw any firm conclusions regarding the role of property rights in determining forest condition, but it indicates that the outcomes of local forest management initiatives may be more de-pendent on local institutional arrangements regulat- ing forest use and maintenance of forest resources than on the type of property rights arrangements. The findings also provide evidence of the methodological suitability of the research approach adopted, which may be useful for addressing many other research questions related to forestry and natural resources management, particularly those involving multiple spatial scales. 展开更多
关键词 森林资源调查 常规研究方法 尼泊尔 管理布局 地球空间信息学 财产权
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产权分割对森林生态系统完整性的影响机制研究
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作者 曾贤刚 段存儒 《中国环境科学》 EI CAS CSCD 北大核心 2023年第9期5011-5019,共9页
过度的产权分割会导致“围栏效应”而降低森林生态系统完整性.基于第6、7、8三次国家森林资源清查数据,以山西省、吉林省和江西省作为研究对象,使用广义渐进双重差分方法分析产权分割对森林生态系统完整性的影响机制.结果表明:各省森林... 过度的产权分割会导致“围栏效应”而降低森林生态系统完整性.基于第6、7、8三次国家森林资源清查数据,以山西省、吉林省和江西省作为研究对象,使用广义渐进双重差分方法分析产权分割对森林生态系统完整性的影响机制.结果表明:各省森林生态系统完整性水平不高,且地区间差异明显.产权分割对森林生态系统完整性有负面作用,会导致群落组成与结构指数的显著下降,但对景观格局则会产生正面影响.生物多样性在产权分割与森林生态系统完整性之间起到中介作用,产权分割对生物多样性有负面影响,并通过改变生物多样性对生态系统完整性产生负面作用.本研究为推动自然资源产权制度的进一步创新提供了现实参考. 展开更多
关键词 产权分割 森林 生态系统完整性 双重差分
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集体林权制度改革进程、效应与演化:2002—2022年 被引量:2
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作者 刘璨 张寒 《改革》 北大核心 2023年第8期140-155,共16页
集体林在生态文明建设和乡村振兴中发挥着重要作用,集体林权制度改革是集体林区改革与发展的关键举措之一。2002—2022年的集体林权制度改革可划分为2002—2011年和2012—2022年两个既相互关联又有明显区别的阶段:前一个阶段以集体林确... 集体林在生态文明建设和乡村振兴中发挥着重要作用,集体林权制度改革是集体林区改革与发展的关键举措之一。2002—2022年的集体林权制度改革可划分为2002—2011年和2012—2022年两个既相互关联又有明显区别的阶段:前一个阶段以集体林确权和推行家庭经营为主要特征,后一个阶段以鼓励集体林权流转以实现规模经济为特征。在构建多元主体互动制度变迁理论分析框架的基础上,利用8 855个跟踪农户样本和351个新型林业经营主体样本进行集体林权制度改革效应与演化分析,研究结果发现:政府决定了集体林权制度改革的启动时机和核心措施,集体林权制度改革是政府精心设计和集体林经营主体自发适应相互作用的制度变迁;生态目标和经济目标的不协同是集体林权制度改革的重要制约因素之一,集体林权制度改革与政府政策制度、市场等动态演化步调不吻合是集体林权制度改革持续推进的动因。应强化制度的系统性和集成性,协同推进集体林权制度改革及其配套改革,坚持顶层设计与“摸着石头过河”相结合,实现政府目标和集体林经营主体目标的耦合与协同,促进集体森林资源可持续经营。 展开更多
关键词 集体林权制度改革 产权制度变迁 新型林业经营主体
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高管特征对食品安全信息披露质量影响研究--以食品类上市企业为例
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作者 毕文泰 郑方方 +1 位作者 田瑞 陈素云 《中国农机化学报》 北大核心 2023年第10期267-274,共8页
企业管理者是食品安全信息披露决策的主体,其特征如何影响食品安全信息质量值得关注。以中国A股食品类上市公司1402份企业样本为例,运用内容分析法构建食品安全信息披露质量指标体系,研究高管特征对食品安全信息披露质量影响。结果发现... 企业管理者是食品安全信息披露决策的主体,其特征如何影响食品安全信息质量值得关注。以中国A股食品类上市公司1402份企业样本为例,运用内容分析法构建食品安全信息披露质量指标体系,研究高管特征对食品安全信息披露质量影响。结果发现:高管性别、学术资本、海外经历和社会资本对食品安全信息披露具有显著正向影响,分别提高食品安全信息披露2.771、0.336、1.630和0.115个分值。进一步研究表明:国有企业中高管海外经历对食品安全信息披露的推动作用更强;制度环境在高管社会资本和食品安全信息披露之间起到调节作用,良好的制度环境更有利于高管社会资本对食品安全信息披露质量的提升。从高管特征这一微观层面扩展食品安全信息披露领域的文献研究,对于完善食品类企业管理者结构和选聘机制,进一步提升企业食品安全信息披露质量提供相关依据。 展开更多
关键词 高层梯队理论 食品安全信息披露 海外经历 学术资本 产权性质
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日本对鞍山钢铁——基地的产业控制基于企业产权和市场定价权的分解与重组视角
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作者 赵亮 闫海 《大连大学学报》 2023年第5期1-8,共8页
根据产业安全和产业链控制理论,基于企业产权和市场定价权的分解与重组视角,文章剖析了1916-1945年间日本对鞍山钢铁产业基地的产业控制方式。研究发现,日本运用政府和国家资本两种力量,按照产业所处的生命周期,通过影响鞍山钢铁基地的... 根据产业安全和产业链控制理论,基于企业产权和市场定价权的分解与重组视角,文章剖析了1916-1945年间日本对鞍山钢铁产业基地的产业控制方式。研究发现,日本运用政府和国家资本两种力量,按照产业所处的生命周期,通过影响鞍山钢铁基地的企业产权和市场定价权,实施了从产业链到关键节点、环节再到关键活动的层次控制,形成了“两力”“两权”、三层次的动态控制机制。研究结果进一步丰富了产业安全和产业控制理论的研究内容。 展开更多
关键词 产业控制 鞍山钢铁基地 产业安全 企业产权 市场定价权
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数据安全政策的解读与优化——基于政策文本和案例文本的质性比较
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作者 王蕊 段尧清 《档案管理》 北大核心 2023年第4期45-48,55,共5页
通过对数据安全相关政策文本和案例文本的质性比较,深入了解当前我国数据安全政策存在的问题和不足之处,分析政策实施中的难点和挑战,并提出有针对性的政策优化建议,对于进一步提高我国数据安全保障水平、推动数据安全研究的深入发展、... 通过对数据安全相关政策文本和案例文本的质性比较,深入了解当前我国数据安全政策存在的问题和不足之处,分析政策实施中的难点和挑战,并提出有针对性的政策优化建议,对于进一步提高我国数据安全保障水平、推动数据安全研究的深入发展、提高政策制定和实施的效果具有重要的意义。 展开更多
关键词 数据安全 政策分析 政策工具 质性比较 社会参与 知识产权 安全保障
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The Organization and Management System of Closing Hillside for Forest as a Regeneration Project (CHFRP) 被引量:1
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作者 LI Tiehua XU Guozhen ZENG Guangzheng XIANG Dong Central-south Forestry University, Zhuzhou 412006. P.R. China Forestry Bureau of Huaihua City, Huaihua 418000. . P.R. China 《Chinese Forestry Science and Technology》 2003年第2期73-78,共6页
By investigation, the thesis analyses and summarizes the forming and developing of CHFRP In Xupu county. We select the Mayandong stock cooperation forest farm as object, adopt the methods such as semi-structure interv... By investigation, the thesis analyses and summarizes the forming and developing of CHFRP In Xupu county. We select the Mayandong stock cooperation forest farm as object, adopt the methods such as semi-structure interview, analysing second data and surveying sample plots, analyse and study the process to clarify the property right, the profits allocated forms and the management forms. The results show that CHFRP can tentatively resolve the contradiction between the forestland using right scattered to eve... 展开更多
关键词 closing hillside for forest as a regeneration project (CHFRP) property right profits allocated forms management system
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The Policy Issues in Lin'an Modei Forest of China
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作者 JIANG Chunqian ZHANG Shougong(Chinese Academv of Forestry. Beijing 100091, China) 《Chinese Forestry Science and Technology》 2002年第2期50-57,共8页
Based on the analysis on policy such as property rights, tax and administration fee, harvesting and circulation of forest products in Lin 'an Modei Forest, some policy issues in the development of Lin 'an Mode... Based on the analysis on policy such as property rights, tax and administration fee, harvesting and circulation of forest products in Lin 'an Modei Forest, some policy issues in the development of Lin 'an Model Forest towards sustainable forest management were raised: (1) The level of timber tax and fee is quite high and there are many kinds of taxes and fees such as fees for forest silviculture, forestry maintenance, forest protection, city construction, town-service, additional fee for education and o... 展开更多
关键词 Sustainable forest management POLICY property rights price of forest products tax and administration fee
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南方集体林区林权制度改革研究 被引量:30
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作者 徐秀英 马天乐 刘俊昌 《林业科学》 EI CAS CSCD 北大核心 2006年第8期121-129,共9页
系统分析南方集体林区存在的产权问题,提出改革的主要内容:1)林权明晰化包括明确林地所有权主体,完善林地所有权的委托代理关系;构建经营权的委托代理关系,明确所有者与经营者之间的权利与义务;科学界定林地使用权和林木所有权主体。2)... 系统分析南方集体林区存在的产权问题,提出改革的主要内容:1)林权明晰化包括明确林地所有权主体,完善林地所有权的委托代理关系;构建经营权的委托代理关系,明确所有者与经营者之间的权利与义务;科学界定林地使用权和林木所有权主体。2)林权的安全性包括改革林地征用补偿制度;建立公益林征用(管制占用)补偿制度;改革商品林采伐限额制度;改革不合理的林业税费政策。3)林权的市场化运作包括降低交易成本;加强森林资源资产评估工作;提升林权交易需求的动力机制;激活林权交易市场的供给机制。 展开更多
关键词 南方集体林区 林权制度 林权安全性 所有权与使用权 委托代理关系
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集体林权制度改革中的农户森林经营行为与影响因素——以福建省邵武市和尤溪县为例 被引量:40
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作者 王小军 谢屹 +1 位作者 王立群 温亚利 《林业科学》 EI CAS CSCD 北大核心 2013年第6期135-142,共8页
森林经营问题在新一轮集体林权制度改革中得到重视。以福建省邵武市和尤溪县作为研究区域,通过156个农户样本数据,分析农户造林、砍杂、施肥和管护4方面的森林经营行为现状;基于利润最大化理论,选择Probit模型,分析家庭、林地、非林生... 森林经营问题在新一轮集体林权制度改革中得到重视。以福建省邵武市和尤溪县作为研究区域,通过156个农户样本数据,分析农户造林、砍杂、施肥和管护4方面的森林经营行为现状;基于利润最大化理论,选择Probit模型,分析家庭、林地、非林生产、林业生产、制度因素5方面17个变量对农户森林经营行为的影响。研究表明:农户造林、砍杂、施肥和管护4类森林经营活动的参与性分别为64.1%、36.5%、33.3%和46.2%;造林行为受户主受教育水平、户主是否主要从事农林业超过10年、用材林比重、林改前是否进行过造林、家庭耕地面积、非农收入占家庭总收入比重的影响显著;砍杂行为受户主年龄、家庭劳动力数量、林地是否距家庭远、林改前是否进行过造林、农户是否对经营制度改革满意的影响显著;施肥行为受户主是否主要从事农林业超过10年、家庭劳动力数量、林地是否距家庭远、非农收入占家庭收入比重、是否对税费制度改革满意、是否对经营制度改革满意的影响显著;管护行为受新一轮集体权制度改革中获得的林地占家庭林地总面积比重、林地是否距家庭远、是否计划修建林道的影响显著。为提高农户森林经营积极性,需要关注农户家庭、林地、非林生产和林业生产方面的特殊性,优化有助于农户提高营林收益和降低营林成本的制度措施。 展开更多
关键词 农户 森林经营 影响因素 集体林权制度改革 福建
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福建集体林权改革中的金融创新与对策 被引量:15
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作者 贾卫国 俞小平 +2 位作者 潘家坪 姚萍 沈文星 《南京林业大学学报(自然科学版)》 CAS CSCD 北大核心 2008年第2期123-126,共4页
在对福建在集体林权改革过程中金融创新经验总结的基础上,指出了目前存在的金融产品与林业生产特点不匹配、商业银行具体针对性地管理办法不够健全,以及林业服务体系不完善等问题限制了林权抵押贷款的金融手段运用。提出了完善政策法规... 在对福建在集体林权改革过程中金融创新经验总结的基础上,指出了目前存在的金融产品与林业生产特点不匹配、商业银行具体针对性地管理办法不够健全,以及林业服务体系不完善等问题限制了林权抵押贷款的金融手段运用。提出了完善政策法规体系、创新信贷产品、建立社区信贷组织、金融部门完善管理制度、林业部门加强服务等建议和措施。 展开更多
关键词 林权改革 金融创新 对策 福建
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基于期权的林木产权评估 被引量:10
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作者 葛颜祥 胡继连 +1 位作者 张维 薛兴利 《资源科学》 CSSCI CSCD 北大核心 2005年第1期80-85,共6页
以活立木形式赋存的林木产权除具有一般资产特征外,还具有自然增值性、可扩张性和可延迟采伐的特性,具有一般实物期权的特征,因而与一般的资产评估有较大的差别。本文将林木产权看作实物期权,并在考虑投资时间价值及未来收益不确定性基... 以活立木形式赋存的林木产权除具有一般资产特征外,还具有自然增值性、可扩张性和可延迟采伐的特性,具有一般实物期权的特征,因而与一般的资产评估有较大的差别。本文将林木产权看作实物期权,并在考虑投资时间价值及未来收益不确定性基础上,采用每年的木材销售量乘以当前市场价格作为现金流,在考虑林木蓄积量的增长速率、价格增长、无风险利率、开采的时滞期、红利贴现率和承包年限等因素的基础上,计算林木资产的估计价值;同时以建设投资和产出成本两部分作为林木资源的开发成本,以此作为期权的执行价格。根据森林资源承包经营情况设定期权有效期限设为30年,并利用过去一段时间林木市场价格指数(环比价格指数)计算林木产权估计价值的波动方差σ2,然后利用Black Scholes期权模型对林木产权的期权价值进行估算,从而可为林木产权的拍卖提供一定的参考标准。 展开更多
关键词 产权 实物期权 市场价格 红利 无风险利率 木材销售 增值性 林木 年限 采伐
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