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本研究对华南地区多个城市天桥高架桥三角梅立体绿化现状进行调查,从基质、盆器、三角梅品种、钢架构设计、浇排灌设备以及三角梅花期调控等方面进行统计与分析,找到最佳的绿化技术环节,并对未来国内南方城市的天桥高架桥立体绿化提出建议。 相似文献
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广州市桥梁绿化技术发展现状及对策 总被引:1,自引:0,他引:1
近年来,广州在城市建设上取得显著成果,但同时也出现了各种繁重的交通问题。在对广州市解放路、环市路、广园路、白云大道、昌岗路等路段的高架桥、人行天桥进行调研后,分析其现状,总结广州市桥梁绿化存在的问题及其原因,并针对问题提出对策:在今后的桥梁设计中,既要考虑桥梁的功能结构,也要考虑景观形式。应选择对环境适应性较强、形态优美的植物品种对桥梁进行绿化;改进桥梁植物的灌溉系统和施肥方法,选择适合植物生长的基质;切实做好桥梁绿化养护管理工作,形成一套科学的桥梁绿化养护技术支持系统。 相似文献
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基于高架桥桥阴特殊生境条件的研究进行合理的绿化植物筛选,对桥阴环境质量改善、城市景观空间的美化具有重要实践意义。选取洛阳市东西走向、南北走向的6座高架桥,分四季研究标准桥段桥阴的光照分布特征,并依据植物生长光环境需求对桥阴空间进行分区,以此筛选出30余种适宜不同分区的绿化植物。研究表明,桥阴空间光分布基本呈现单谷变化的趋势;南北走向桥体整体光照强度优于东西走向桥体,桥体高宽比越大,桥阴空间采光越好;桥体隔离缝对其正下方狭窄区域光照有增强效果。高架桥桥阴存在植物生长“死区”和强光照区,因此,依据实测桥阴光照进行合理绿化是改善景观效果的重要途径。 相似文献
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大同矿区道路绿化植物配置研究 总被引:1,自引:0,他引:1
《内蒙古林业调查设计》2015,(4)
文章通过对大同矿区道路植物品种的实地调查,总结出适合本地栽植的36种常见植物品种,阐述了植物配置方法,并提出了道路绿化存在的问题及建议,为今后矿区绿化植物品种选择及植物配置提供参考。 相似文献
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目前对城镇绿化的要求越来越高,因绿化是提高城镇环境质量最直接最有效的措施。而构成绿化的主要材料是绿化植物,其主体是树木。作为一个城镇,当然是绿化树木品种越多,越能够丰富绿化空间。但是由于地域、气候、科技、经济与自然因素和人为因素的制约,绿化树木品种的利用也受到了限制,已经应用的树木品种也不可能都非常理想。那么对城镇现有的树木品种制定一个标准进行选择,进而对绿化树木品种进行科学应用,这对于形成地方特色和风格都有着重要的作用。 乌兰浩特市植被属中温带草原亚带,植被类型以半干旱草原植被为主。据调查统计… 相似文献
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高位伸缩杆式拖牵索道是冬季滑雪时运送滑雪者的一种运输设备。通过具体设计实例,介绍了高位伸缩杆式拖牵索道的原理和结构组成。 相似文献
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Micro-environmental factors viz., soil moisture and light intensity are important factors that affect natural regeneration
in forests. These factors vary spatially depending on the overhead canopy density of the forest. The present study focused
on studying the effect of variation of soil moisture and light intensity on natural regeneration of sal species (Shorea robusta) under different micro-environments due to overhead canopy of varying forest density. Experimental plots of 40m× 40m size
were laid under different overhead canopy densities in a small sal forested watershed in the foot hills of Himalayas in Nainital District of Uttarakhand State, India. The plots were monitored
on a long term basis for soil moisture at multi depths, light intensity and natural regeneration of sal. The results of the study revealed that the natural regeneration was highest under C1 (up to-0.30) canopy followed by C2
(0.30–0.50), and C3 (0.50–0.70) canopies. The C3 canopy showed the dying back of sal shoots over 4 years of study. The highest R2 value of linear regression between incremental score of plot regeneration and average soil moisture content was obtained
as 0.156 for average soil moisture content during non-monsoon months at 100 cm depth. The R2 value between incremental score of plot regeneration and annual average light intensity was obtained as 0.688 which indicated
that the regeneration is largely dependent on the light intensity conditions during the year. The multiple linear regression
analysis between the incremental score of regeneration and the average light intensity and average soil moisture content revealed
that that about 80% of variation in regeneration is explained by both the factors. 相似文献
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为给底部渗灌应用于育苗生产提供理论依据,以薄壳山核桃1年生容器实生苗为试材,研究了底部渗灌对不同生长时期的幼苗根系活力及保护酶类的影响。结果表明,底部渗灌显著促进了生长初期薄壳山核桃容器苗根系TTC还原强度,达到362.83μg/(g·h),显著高于上方喷灌苗木根系还原强度,且生长中后期也能保持较高水平的根系活力;底部渗灌处理后,苗木根系MDA含量及SOD、POD和CAT保护酶活性变化趋势与上方喷灌苗木一样,均表现出先上升后下降的趋势,说明底部渗灌对生长初期苗木根系有一定的胁迫,苗木通过提高根系中保护酶的活性减轻伤害,不断适应根系环境。 相似文献
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结合桥式起重机工作特点,应用拉格朗日方程建立桥式起重机吊重偏摆系统的动力学模型。以QD32/5型号桥式起重机作为仿真对象,采用Matlab/Simulink仿真软件对系统在起停阶段和制动后的摆动情况进行仿真。分别控制钢丝绳长度为5 m和10 m,吊重质量为12.5 t和25 t,研究它们对系统振动特性的影响。仿真结果表明:吊摆系统在起停阶段做受迫摆动,制动后做有阻尼摆动;小车运行速度不能稳定,定位的主要影响因素是吊重的质量;制动阶段最大摆角分别为0.12、0.12和0.18 rad,需要加以控制;制动后吊重摆动完全消除的时间都超过120 s。 相似文献
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A mail-out survey questionnaire was developed by the Agroforestry group at the University of Guelph to determine the level of awareness and interest in the adoption of agroforestry systems by landusers from four townships in Wellington County, Ontario. The questionnaire investigated: (1) the current level of knowledge regarding windbreaks, woodlots and plantations, intereropping, riparian plantations and silvipasture, (2) the present level of participation in each of these systems on-farm, (3) the perceived benefits and/or drawbacks of each of these initiatives with respect to total farm income, income diversity, land rehabilitation, land value/equity, soil/water conservation, labour intensity, overhead and return on the term of investment.The majority of respondents were familiar with conventional agroforestry systems such as windbreaks and woodlots/plantations (80%, 62% respectively), therefore the level of interest in the adoption of these practices was significant (74%, 66% respectively). Response rates were lower for silvipasture, riparian plantations and intercropping, most likely as result of the low level of familiarity with these practices (20%, 32%, 4% respectively). Respondents commented that agroforestry systems would have a neutral effect on farm income, and would increase land stewardship. In some cases, interested landusers indicated a willingness to participate in agroforestry systems even though they anticipated increases in overhead and labour intensity; however, this was only true if they held land stewardship as a priority. Landusers were more concerned with the economic aspects of agroforestry, as a determinant to the future adoptability of particular practices. Age, gender, farm operation and farm size were not correlated with the adoption of agroforestry systems.The success of agroforestry programs on farms in the study area is largely dependent on the attitudes and willingness of landusers to participate in non-traditional agricultural systems. 相似文献
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随着因特网的飞速发展 ,在网络中出现了越来越多的移动用户 .针对 IPv6的不足提出了为移动节点分配一个专用地址空间的思想 ,并且为移动 IP扩展了一个新的 IP扩展头、两个新的 ICMP报文类型 ,在这些协议扩展的基础上提出了对移动 IP的一种优化策略 ,使用这些协议扩展 ,可以缩减移动计算机网络的额外开销、改善网络的服务质量 (Qo S) . 相似文献
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介绍了一种面向标准单元设计流程的软错误率(SER)分析及电路加固方法,其适用于组合电路以及时序逻辑的组合部分。采用该方法对ISCAS’85 Benchmark电路进行实验分析的结果表明,其运行速度快,在引入较小面积、时序开销的前提下取得了很好的加固效果。 相似文献
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林木容器育苗底部渗灌技术研究现状与展望 总被引:1,自引:0,他引:1
林业苗圃容器育苗采用上方喷灌易造成水分浪费、养分淋溶流失及环境污染。容器苗底部渗灌技术是利用育苗基质毛细管作用从容器下方吸收水分对苗木进行灌溉。该系统由储水箱、水泵、施水槽等设备形成水分封闭回流系统,可实现灌溉水循环利用,是一种有效管理容器苗水肥的方法。文中介绍了容器苗底部渗灌技术形成背景与系统组成,并从苗木质量、水肥利用效率、基质EC值和pH值以及病虫害等方面对容器苗底部渗灌系统进行评述,同时对该技术的深入研究和应用提出了展望。 相似文献