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马忠平王东红 《内蒙古林业调查设计》2015,(6):41-41
蒙古莸(Caryopteris mongholica Bunge)为中、西部地区分布较广的野生灌木,具有较强的观赏性、抗逆性和适应性,是干旱、半干旱地区重要的水土保持植物种,集很高的生态应用、药用、观赏及经济价值于一身,开发利用前景极为广阔。文章对蒙古莸的生物学特性、引种驯化栽培及园林应用进行了初步的研究和论述。 相似文献
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来到美国密苏里州东南部,便进入了风光旖旎的。奥索卡山区。这里有世界上知名的喀斯特泉,有两条永远自由奔流的河流,同时这里还是奥索卡隐鳃鲵等珍稀生物的家园。 相似文献
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应用节水耐旱园林观赏植物,是解决园林绿化水资源消耗大与我国北方淡水资源短缺矛盾的有效途径之一.金叶莸、互叶醉鱼木是乌兰察布市成功引种的节水耐旱园林观赏植物,其不仅可节约水资源,而且在雨量较少、土壤沙化的干旱地区,更显经济实用、美观新颖,并具有耐寒、耐旱、耐修剪、耐粗放管理等独特优势. 相似文献
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指出了美国城市规划的脚步领先全球,在传统商业社区景观上也值得中国借鉴。通过此次美国景观规划设计的体验之旅,对美国的传统商业社区中的圣地亚哥老城区与旧金山渔人码头进行了初步调查与分析,重在了解其历史街区的景观艺术风格、文化遗产、空间与色彩上的特点,及如何应对老城区人居退化的问题。学习其文化、设计手法等方面经验,作为今后此类设计的参考依据。 相似文献
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国家公园保护着具有国家代表性的自然生态系统。文中以美国国家公园景观视觉资源管理系统的形成及发展为研究对象,梳理其百年发展过程中5个阶段面临的不同威胁、对应措施和不足;总结了美国国家公园视觉资源管理体系的4个重要经验,包括景观视觉资源政策法规保障、建立统一的管理框架、注重科研和经验总结以及形成丰富的合作管理层次。针对当前我国国家公园建设中视觉资源管理的现状,提出4点建议:1)拟定国家公园景观视觉资源专项法案;2)构建景观视觉清单;3)强化科研对视觉资源管理的支撑;4)加强视觉资源清单基础上的多层次合作。 相似文献
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据ASLA官方网站消息,美国景观设计师协会(ASLA)成员,亚利桑那州菲尼克斯市的Angela Dye女士当选下一届ASLA主席。 相似文献
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大学校园景观孕育着校园历史文脉与特色风格,是校园总体规划的重要组成部分,对校园的规划布局、空间构成和环境塑造发挥着决定性作用。美国大学校园景观在舒展个性的同时坚守传统,形成了独具一格的校园风貌。文章以密歇根州立大学校园为研究对象,梳理其校园景观规划发展的脉络,探源校园绿地建设理念与方法,总结老校园如何进行景观保护与管理、新校园如何延续校园风格等方面的优秀经验,以期为我国大学校园景观建设提供有益的借鉴。 相似文献
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扑救森林火灾是一项十分复杂的系统工程,因此建立科学规范高效的指挥系统十分重要。在对美国森林火灾扑救指挥系统简要介绍的基础上,从架构理论和系统特征两方面对其安全高效运行的机制进行了分析,认为借鉴美国森林火灾扑救指挥系统的先进理念和成功经验,可以加快完善我国的森林火灾扑救指挥体系,进一步提升科学指挥的水平。 相似文献
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L. C. Rule J. P. Colletti T. P. Liu S. E. Jungst C. W. Mize R. C. Schultz 《Agroforestry Systems》1994,27(1):79-88
A survey, conducted in 1990–1991 on agroforestry and forestry-related systems in eight Midwestern states, showed that three traditional and three nontraditional agroforestry systems are practiced in the region. Of 46 traditional systems reported, most common was agrisilviculture (28), then silvipasture (12) and agrisilvipasture (6). These systems often involved corn, soybeans, and hay planted with tree species for nut, timber, or Christmas tree production, and cattle. Non-traditional agroforestry systems were field windbreaks/shelterbelts (29), treeshrub intercropping systems (21), and boundary plantings (11). These systems involved a variety of northern hardwood species evergreens, and shrubs. There was also a preponderance of specialized systems (97) of growing trees with the production of mushrooms, nuts, syrup, wildlife, and other nonwood products. The survey is exploratory in nature and, although the results may not represent a complete count of people involved with agroforestry in the region, the numbers reported may indicate where a practice may be prevalent. The results reflect the fact that much work still needs to be done by agroforesters in this region. They also provide some basis for further research on more suitable systems, and for identifying other researchable questions on agroforestry for the region. The methodology also made possible a bigger nucleus for networking of agroforesters and other interested people in the Midwest. Finally, although not normally considered as agroforestry, the significance of the other specialized systems reported in this survey is that they offer varied ways of connecting forestry with other activities in a largely agricultural landscape, and that they may even be seen as opportunities for easier transition into agroforestry. 相似文献
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美国林业人才培养及启示 总被引:1,自引:1,他引:0
高层次林业人才培养是林业科学可持续发展的关键.美国高等林业教育在发展过程中积累了丰富的经验, 形成了较完备的教育体系.然而最近几十年来, 美国林业人才教育出现了一些值得关注的趋势, 一是某些早期的林业人才项目宣告提前结束或主动放弃认证资格; 二是研究型或具备博士学位授权的院校在逐渐收缩林业人才培养项目, 而科研力量相对较弱的大学却在逐渐增加林业教育项目.文中简述美国林业人才培养概况, 介绍美国林业人才培养项目的发展趋势, 分析美国人才培养所面临的挑战并探讨美国涉林院校对林业人才培养模式的调整, 提出我国林业人才教育培养的思考与启示. 相似文献
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我国目前的保护地保护与利用、规划与管理的矛盾突出,国家级风景名胜区人满为患,生态压力剧增,大批省级风景名胜区则无人问津且疏于管理。而美国的州立公园系统为国家公园有效承担起生态安全屏障功能,州立公园的基本功能之一就是在资源保护和管理的原则下,以适中的成本提供邻近家庭且基于资源型的户外游憩机会,实现公民自然和文化福利。文中介绍了美国州立公园系统概念与定位、规划体系构成、规划编制依据以及规划方法,总结了美国州立公园的规划经验,包括具有完备法律法规体系保障规划实践、公众参与和多方案比较机制以及多样性的分析方法支持决策等,提出了完善我国保护地体系的建议,以期为我国保护地体系规划、建设和实施提供借鉴与参考。 相似文献
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C.W. Woodall C.M. Oswalt J.A. Westfall C.H. Perry M.D. Nelson A.O. Finley 《Forest Ecology and Management》2009
Changes in tree species distributions are a potential impact of climate change on forest ecosystems. The examination of tree species shifts in forests of the eastern United States largely has been limited to simulation activities due to a lack of consistent, long-term forest inventory datasets. The goal of this study was to compare current geographic distributions of tree seedlings (trees with a diameter at breast height ≤2.5 cm) with biomass (trees with a diameter at breast height > 2.5 cm) for sets of northern, southern, and general tree species in the eastern United States using a spatially balanced, region-wide forest inventory. Compared to mean latitude of tree biomass, mean latitude of seedlings was significantly farther north (>20 km) for the northern study species, while southern species had no shift, and general species demonstrated southern expansion. Density of seedlings relative to tree biomass of northern tree species was nearly 10 times higher in northern latitudes compared to southern latitudes. For forest inventory plots between 44° and 47° north latitude where southern tree species were identified, their biomass averaged 0.46 tonnes/ha while their seedling counts averaged 2600 ha−1. It is hypothesized that as northern and southern tree species together move northward due to greater regeneration success at higher latitudes, general species may fill their vacated niches in southern locations. The results of this study suggest that the process of northward tree migration in the eastern United States is currently underway with rates approaching 100 km/century for many species. 相似文献