农牧交错带农田景观格局对土地生态环境安全的影响——以呼和浩特市为例

在GIS支持下,利用卫星遥感影像提供的信息和非遥感信息想结合的方法,获得研究区农田景观空间分布格局和生态环境现状数据资料。从区域农田生态系统特点和地区土地生态安全角度出发,通过对市域农田景观空间格局特征及其对土地生态环境安全影响的分析,显示出农田景观格局的空间差异性与破碎度高是农牧交错地区土地生态环境安全的重要影响因素。调整土地利用结构、加强地区土地整理与生态农业建设投入,是保证区域土地生态环境安全,促进区域社会经济可持续发展的主要途径。     

快速城市化过程中城市土地覆被的时空动态特征

1990—2005年间，是广州市经济快速发展和城市景观变化最大的时期，以同时段TM影像解译得到广州市的土地覆被类型图，从数量结构、空间信息及位置转移和景观等方面，分析了广州市土地覆被的动态特征．数量结构的研究结果显示：在快速城市化过程中广州市的耕地、林地等自然资源的利用程度在加大，自1995年起，这种变化的趋势开始减缓；土地覆被类型之间的信息与位置的转移变化频繁，并且表现出空间位置分异的特征．景观特征指数分析结果表明：广州市城市土地覆被向破碎化方向发展，城市建设用地呈扩展之势．     

乡村旅游开发与老年人环境感知的关系

在浙江省余姚市大岚镇柿林村国家4A级景区对29位老人与43位非老人进行分组问卷调查，对老年组与非老年组的自然环境感知、经济环境感知、社会关系感知、旅游及游客感知差异进行卡方检验（X^2）．结果表明，两组人群对环境感知存在着明显差异．乡村旅游地老年人环境感知具有较强烈的乡土意识、对游客与旅游开发普遍持积极的支持态度、希望承担旅游地主人的角色、希望更多分享旅游带来的经济利益等特点．从旅游地老年人这一特殊人群的角度证实了旅游地居民支持旅游发展9个要素的结论，同时发现了中国老人的一些不同之处，提出了期待期的概念，提出从物质和精神两个层面入手，实现乡村旅游可持续发展的建议．     

Competing narratives for the future of European agriculture: the agri-environmental consequences of neoliberalization in the context of the Doha Round

Whatever their eventual outcome, the current round of international trade negotiations taking place as part of the Doha Development Round offers a clear demonstration of the growing influence of a neoliberal agenda for international agricultural policy reform. Despite being powerfully supported by an alliance of agribusiness interests and country groupings, neoliberalism is far from universally accepted as the model for the future governance of an agriculture which is both commodifying and market led. This paper assesses the nature of the resulting debate and the range of alternative visions being proposed. It analyses the development of the European negotiating stance within the current round of trade talks and compares the merits of a decoupled policy approach to managing the rural environment with one much more closely linked to the practice of farming. The paper concludes by suggesting that an outcome of the continuing liberalization of agricultural policy will be a more demarcated countryside, in which productive and internationally competitive operators will increasingly be removed in space and in terms of policy treatment from the large number of economically marginal producers whose role will be to supply the public environmental goods under contract from the state.     

高分辨率遥感影像在城市三维景观建立中的应用

 高分辨率遥感影像具有高空间分辨率、高清晰度、信息量丰富及数据时效性强等优点，是建立城市三维景观的良好数据源。本文对高分辨率遥感影像在城市三维景观建立中的相关技术与方法进行了初步探讨，对其应用的优势及存在问题进行了简单分析。研究表明，基于高分辨率遥感影像能够快速、便捷、经济地建立高时效性的城市三维景观。     

Mercury anthropogenic loadings vs. mercury levels in fish： Baihua Reservoir as an exemplary case study

It is still disputed in the scientific community whether it is possible to trace a direct link or even proportionality between mercury （Hg） anthropogenic loadings to lake ecosystems and resulting methylmercury （MeHg） levels found in fish tissues. We present here the exemplary case of the Baihua Reservoir, located on the Maotiahoe River, near Guiyang （Guizhou, China）. Baihua was impacted for many years by Hg-contaminated effluents from industrial source. While sedimentary profiles exhibit extreme enrichment in sedimentary Hg burden, fish species harvested from the reservoir still present low Hg levels. Thus we propose here that in the case of Hg, loading does not tell it all and one must take it into account the net methylation capacity of lake ecosystems and its ability to efficiently bioaccumulate MeHg along the trophic web.     

“数字台湾”与中央山脉保育轴之划设、经营和管理

本研究系应用数字地球系统理论于中央山脉保育轴经营管理机制建置 ,并依 IUCN之保育区划设标准 ,作为未来研订中央山脉保育计划之分区准则与数字台湾系统建立之发展模式。数字台湾之观念乃源于数字地球突破传统信息空间、政策经营之多向度信息整合 ,同时考虑克服科技应用与时间效益以及决策兼蓄解决传统资源管理在空间地理与生态艺术上之综合性问题。