福建省商品林投资风险评价

本文构建了福建省商品林投资风险评价指标体系。然后,采用因子分析法,对福建、浙江、广东、江西、湖南、湖北、云南等7个省份的商品林投资风险进行横向评价和比较,通过评价,发现2007年在7个比较省份中,福建省综合评价得分排名第二,风险较小。在此基础上,找出影响福建省商品林投资风险的薄弱因子,并提出相应的对策。     

定西市安定区退耕还林地植物群落特征研究

本文选择Shannon-Wiener物种多样性指数、Pielou均匀度指数、Margalef丰富度指数和生物量作为研究的基本指标,分别探究了安定区不同林型下群落稳定性和植物的水土保持功能。结果表明：从物种多样性对群落稳定性的影响来看,应选择适生树种及合理的配置体系以提高物种多样性,进而促进群落的稳定;从对各植物种的生物量定量分析来看,山桃、柠条生物量,尤其是枯落物生物量较高,可以发挥其减少地表径流、增加土壤养分,蓄水保水的作用。     

广州城市绿地植物群落生态效应分析

对广州城市绿地中不同植物群落的生态效应进行对比分析和研究,探讨了不同的绿地群落在物种丰富度、三维绿量、空气质量改善、降温增湿等方面的差异及原因,指出叶面积指数在绿地生态结构与生态功能方面起着关键指标的作用,以期为城市绿地的生态建设提供相关依据。     

Effects of management on coarse woody debris volume and composition in boreal forests in northern Sweden

Forest management practices have led to a reduction in the volume and a change in the composition of coarse woody debris (CWD) in many forest types. This study compared CWD volume and composition in reserves and two types of managed forest in the central boreal zone of Sweden. Ten areas were surveyed, each containing clear-cut, mature managed and old-growth stands, to determine the volume of standing and lying CWD in terms of species composition, decay class and size class. Volumes of CWD on clear-cuts and in mature managed forests were high compared with previous studies. Old-growth forests (72.6 m³ ha^?1) contained a greater volume of CWD than mature managed forests (23.3 m³ ha^?1) and clear-cuts (13.6 m³ ha^?1). Differences were greatest for the larger size classes and intermediate decay stages. Despite stand ages being up to 144 years, CWD volume and composition in managed forests was more similar to clear-cuts than to old-growth forests.     

油茶无性系及自然林选优调查分析

在江西省6个县进行油茶无性系及自然林选优调查分析,结果表明,长林、赣无、赣州油系列无性系优树整体表现出较好的经济性状,主要表现为鲜果含油率、平均冠幅产果量及产油量较高,高产优树较多,自然林优树整体表现低于无性系优树,但存在一部分表现高产的优树,无性系优树间、不同地区自然林优树间、同一地区自然林优树间经济性状差异较大,这为油茶选优工作提供了参考依据和空间。今后油茶选优宜重点从现行推广的无性系中进行优中选优,结合在自然林中进行一定的选择,以达到节约成本、提高效率的目标。     

Effect of Peat-based Container Media on Establishment of Scots Pine,Norway Spruce and Silver Birch Seedlings after Transplanting in Contrasting Water Conditions

Abstract

Urban woodlands are the subject of complex decision-making that requires a strategic overview of the resource. This article contributes a national study of municipal woodland in Denmark. Data were collected among all Danish municipalities through a postal survey (with a response rate of 52%). As much as 83% of the woodland units were located within urban settlements or at their fringe, emphasising that municipalities are important urban woodland providers. Municipal woodland resources were typically divided into many separate units of varying size. On average, the responding municipalities owned 12.6 woodland units with an allocated area of 265 ha, resulting in a mean size of 21.5 ha. A general lack of management plans, and a significant drop in recreational facilities provided with decreasing woodland size indicate that the recreational use potential of small woodland units was largely overlooked. Municipal woodland units frequently bordered other woodland or nature areas of different ownership. Thus even small municipal woodlands can play a key role in the development of multifunctional green infrastructures in the urban landscape. Only municipalities with extensive woodland property had issued a woodland policy, and/or certified woodland management. This indicates a need for development of governance and strategic management instruments attractive to municipalities with limited woodland property.     

索道融入城市交通系统的可行性分析与展望

在简要介绍我国城市交通现状和未来趋势的基础上,提出应该大力发展公共交通,建立完善、多元化的城市交通网络。结合索道的特点,分析索道在公共交通网络中应该发挥的作用,讨论在5类特殊区域建设索道的可行性。     

基于城乡绿地功能角度的城乡绿化一体化布局探讨

建设生态城市是今后城市发展的方向、目标,而实施城乡绿化一体化,可以为生态城市建设提供良好的基础。作者介绍了城乡绿地含义,从城乡绿地功能角度分析了城乡绿地的布局方式,提出城乡绿地可以采用"片状式、网状式、近小远大式、点线面结合式"布局。     

Plantation Forests for Sustainable Wood Supply and Development in China

With the implementation of Natural Forests Protection Program, wood resource base in China is shifting from naturally grown forests to plantation forests. This paper reviews: 1) The evolution of Chinese decade-long reforestation program and its contribution to sustainable wood supply and development, and 2) impacts of "China's Natural Forest Protection Program and " Fast-Growing and High-Yield Plantation Program in China " on China's wood supply and sustainability. In addition, this paper highlights Chinese national researches on the integrated intensive management and utilization of the plantation resource.     

基于地域性的城市公园设计

文中从如何将地域性景观切入到公园的设计入手,通过相关理论研究得出地域性景观的主要组成要素,通过对相关案例分析提出基于地域性的公园景观的规划布局要点及设计手法。