中国有机农业认证信息中心空间组织特征及影响度评析   总被引：1，自引：0，他引：1  

李言鹏  王玉华  谷博轩 《世界地理研究》2014,(3):149-157

随着我国食品安全、环境压力、三农问题、绿色贸易壁垒等问题的加剧,有机农业作为一种可持续的新型农业发展模式,为以上问题的解决提供了新的范式。有机农业认证作为连接有机农业生产者与消费者的纽带,是有机农业生产链的核心构成之一。有机农业认证体系是我国有机农业生产网络中信息网络的重要组成部分,有机农业认证机构作为信息网络的核心构成,对认识我国有机农业信息网络的结构与组织有着积极的作用。本文基于对有机认证机构为代表的信息中心的空间分布、组织与影响腹地范围分析,认为我国目前有机农业信息中心空间分布呈较强的不均衡性特征,且发育程度具有一定的等级层次性。采用层次分析法进一步对中国有机农业认证信息中心的影响度进行评析,分析表明我国有机认证信息中心分为三大综合等级。此外,选取以北京、浙江和辽宁为代表的重点地域空间进行探讨,并针对不同等级的有机农业认证信息中心提出相应的发展策略和建议。  相似文献   

DNC标准与我国CDC标准比较与应用     

黄正启  李树军 《测绘工程》2014,(5):66-70

目前国内关于DNC标准方面的研究较少,为了更好地利用标准,便于各类人员使用DNC数字海图数据,文中首先介绍DNC标准和CDC标准的基本情况,然后通过两种数据标准对照分析,找出标准之间所有的差异性,最后结合实际提出相关工作人员在工作中应注意的问题。经过实践证明,文中的研究成果能够加快我国CDC标准的完善。  相似文献   

集体经济组织在农地流转中的作用探讨     

李凤梅  兰艳君 《国土资源情报》2014,(5):32-38

农地流转中农户与集体经济组织的关系为委托代理关系,集体经济组织在农村土地流转中扮演着委托者和代理者的双重角色,承担着委托者和代理者的双重职责。农地流转中集体经济组织存在违背农户意愿的强制流转、土地流转收益分配不均、对土地承租方经营管理监督缺失、同土地承租方勾结侵害农户利益等背离自身定位的行为,原因主要在于农户个体的信息弱势地位、专业中介市场的不成熟、集体经济组织自身的利益驱动、政府不合理的干预和控制、法律环境不完善。要想引导与规范农地流转中集体经济组织行为,应当完善信息披露制度,培育专业中介市场,完善激励约束机制,正确定位政府职能,健全法律法规体系。  相似文献   

The transportation sector and low-carbon growth pathways: modelling urban,infrastructure, and spatial determinants of mobility     

Henri-David Waisman  Celine Guivarch  Franck Lecocq 《Climate Policy》2013,13(2):106-129

This article contributes to the controversial debate over the effect of spatial organization on CO₂ emissions by investigating the potential of infrastructure measures that favour lower mobility in achieving the transition to a low-carbon economy. The energy–economy–environment (E3) IMACLIM-R model is used to provide a detailed representation of passenger and freight transportation. Unlike many of the E3 models used to simulate mitigation options, IMACLIM-R represents both the technological and behavioural determinants of mobility. By comparing business-as-usual, carbon price only, and carbon price combined with transport policy scenarios, it is demonstrated that the measures that foster a modal shift towards low-carbon modes and a decoupling of mobility needs from economic activity significantly modify the sectoral distribution of mitigation efforts and reduce the level of carbon tax necessary to reach a given climate target relative to a ‘carbon price only’ policy.

Policy relevance

Curbing carbon emissions from transport activities is necessary in order to reach mitigation targets, but it poses a challenge for policy makers. The transport sector has two peculiarities: a weak ability to react to standard pricing measures (which encourages richer policy interventions) and a dependence on long-lived infrastructure (which imposes a delay between policy interventions and effective action). To address these problems, a framework is proposed for analysing the role of transport-specific measures adopted complementarily to carbon pricing in the context of international climate policies. Consideration is given to alternative approaches such as infrastructure measures designed to control mobility through less mobility-intensive denser agglomerations, investment reorientation towards public mode, and logistics reorganization towards less mobility-dependent production processes. Such measures can significantly reduce transport emissions in the long term and hence would moderate an increase in the carbon price and reduce its more important detrimental impacts on the economy.  相似文献   

面向智慧城市建设的地理实体构建方法     

王琳  郭功举  刘一宁 《测绘通报》2022,(2):20-24

作为政府管理的基础单元,地理实体的构建是智慧城市建设的重要内容。本文在分析国内外地理实体相关研究和应用的基础上,基于上海市“智能化全息测绘”实践经验,阐述了面向城市级应用的地理实体构建范围;以院落和房屋两类典型实体为例,分析了其数据特点,探索了其构成内容及构建规则,为智慧城市建设中地理实体的构建和智能化应用提供了参考。  相似文献   

三维地形可视化技术研究进展   总被引：2，自引：0，他引：2  

靳海亮  高井祥 《测绘科学》2006,31(6):162-164

三维地形是虚拟自然环境中不可缺少的因素,也是虚拟仿真领域中视景系统的重要组成部分。该文将地形生成技术概括为三维地形简化技术、大规模地形数据的动态调度与地形简化相结合的处理技术和地形纹理数据的组织与应用技术等三大类,并分别介绍了这三类技术的相关理论和方法。  相似文献   

Organizing coordination for an ecosystem approach to marine research and management advice: The case of ICES     

《Marine Policy》2017

This study examines the reorganization of formal coordination structures of a unique international public organization involved in marine governance in Europe, namely the structural reorganizations of the International Council for the Exploration of the Sea (ICES) between 1999 and 2009. The findings indicate that the reorganizations of ICES’ formal coordination structures were not driven primarily for reasons of efficiency, by clear and consistent goals, and by clear means-ends considerations for organizational design as proposed by rational perspectives in organization theory. Instead, the formal coordination structures have also been adapted to live up to changing expectations in the institutional environment, to modern management concepts in marine governance such as the Ecosystem Approach to Management (EAM), and to ensure the legitimacy of the organization. However, it is also found that institutional explanations alone are insufficient to comprehensively understand why the formal organizational structures of ICES were reorganized. Instrumental and cultural perspectives in organization theory as well as resource-dependence theory additionally add to understand how ICES responded to external demands and why organizational structures have been changed.  相似文献   

省级地理信息动态更新技术体系研究     

李思谕  龚竞  杨军 《测绘通报》2021,(1):130-137

目前,测绘地理信息生产方式还是以传统的大规模、周期性、全要素生产为主,缺少覆盖更新数据采集、处理入库、提取分发、配图切片、发布全过程的数据标准、生产协调机制、工艺流程和支撑软件系统.本文从重要地理信息要素标准、地理信息变化发现、更新生产调度、外业要素采集、数据库更新与发布等地理信息更新全流程进行研究,提出了1:1万基础...  相似文献   

空间组织与效率研究的经济地理学意义   总被引：9，自引：0，他引：9  

金凤君 《世界地理研究》2007,16(4):55-59

空间组织与空间结构的研究始终是经济地理研究的核心内容之一,但关于空间效率的研究则比较薄弱。本文依据理论与实践需求,从五个方面阐述了研究空间组织与空间效率的重要性和意义,提出了社会经济活动的空间组织应遵循哲学（伦理）-技术-经济的规律以及科学的空间组织是释放我国区域经济发展潜力的第二动力源泉等的观点。  相似文献