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本刊讯2011年广州迎春花市筹备工作已全面启动,各区迎春花市地点和开放时间基本确定,仍设10个花市,除天河花市重回体育中心,花都花市易址外,其余花市地点都与去年一样。 相似文献
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<正>桂花是我国南方地区重要的园林绿化树种。因其具备绿化、美化和香化三重功能,目前已有20多个城市将其定为市花,于是不少地方都已经或准备把它作为"护路使者"。然而,根据我们历年来的调研材料,桂花是一个非常理想的景观树和采花树,但却并不是 相似文献
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作为北京市市花之一的月季,在北京的城市绿化、生态环境建设和美化人民生活中发挥了重要作用。5月23日,为期10天的北京月季文化节在北京市植物园盛大开幕,包括1300个品种的15万株月季以各种造型展示在公众面前,千姿百态、姹紫嫣红的月季花吸引了众多市民和游客。 相似文献
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黄山市城区行道树结构特征分析 总被引:3,自引:0,他引:3
行道树是城市森林的重要组成部分,城市行道树结构特征的研究,有助于城市规划和建设,为正确评价城市生态系统的服务功能提供依据。本文通过对黄山市城区15条主干道路行道树的抽样调查,发现有乔木树种24种,灌木树种37种,分析行道树的组成、直径和冠幅结构及行道树物种多样性。结果表明,黄山市城区行道树组成优势种明显,直径在6~14cm的行道树占55.7%,街道之间行道树冠幅差异明显,新安北路的冠幅最大,为11.31m,天都大道冠幅最小,为2.4m,滨江中路树种多样性最大,H指数为2.6850,黄山东路树种多样性指数最小,H值为0.7498。 相似文献
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合肥市行道树生态效益研究 总被引:6,自引:0,他引:6
本文按道路长度的10%抽样调查合肥市市区100km2范围主要道路行道树现状,运用I-tree软件分析行道树结构,估算行道树生态经济效益,包括截留雨水、吸收CO2、改善大气质量、提供美学价值及储碳功能。研究结果表明:研究区主要道路行道树16种,计38800余株,其中香樟、广玉兰、二球悬铃木、国槐4个树种占行道树总数的68.7%;94.5%的行道树评为健康,显示总体健康状况较好,作为合肥市树的广玉兰因管护问题健康状况不佳;行道树中胸径<15cm 的小树比例高达64.6%,大多是近年道路改造后栽植。行道树发挥的年生态效益5145.8万元,其中截留雨水的效益占89%,另外储碳效益759.3万元;单株效益最高的是二球悬铃木,其次是栾树、国槐、乌桕,因这些树种胸径>30cm 的树木比例较高。分析行道树的结构与功能可为行道树规划、建设、管理提供必要的参考。 相似文献
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The Event tree model for failure of city gas pipeline is established in this article according to the property of city gas,the fault tree analyses are incorporated into the event tree. The fault trees are used to analyze the causes and probabilities of the initial event and subsequent events, while the event tree is used to analyze the subsequent event of gas leaking and the probabilities of the consequential events. Thus, a comprehensive analysis method for failure of city gas pipeline and its hazard has been produced. 相似文献
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基于植物多样性的衡阳市道路绿化研究 总被引:2,自引:0,他引:2
在采用抽样调查方法对衡阳市区道路绿化进行调查的基础上,分析了衡阳市道路绿地的物种组成、物种丰富度、频度及植物多样性组成。结果表明:衡阳市区道路绿地植物种类共有60种,其中木本植物50种,占总数的83.3%。木本植物中常绿植物35种,落叶树种15种;乔木20种,灌木30种。在乔木层中,樟树、广玉兰、桂花、二球悬铃木、欧美杨、雪松等出现频度及丰富度均较高;灌木层中出现频度及丰富度较高的植物有:红花檵木、海桐、石楠、月季、紫叶李等,并针对城市绿化现状与存在的问题提出了道路绿地建设的建议与对策。 相似文献
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《Journal of Landscape Research》2016,(4)
Located in the transitional area from subtropical zone to warm temperate zone,Xinyang City is endowed with rich plant resources.With the development of modem urban landscape architecture,Xinyang City has had increasing needs on quality ornamental tree species.In view of the badly-needed ornamental tree species of local landscaping,this paper screened 20 ornamental tree species from the previously-investigated ones,then applied Analytical Hierarchy Process(AHP) to establish the evaluation system according to ornamental characteristics of these species(such as flower color),and used this system to evaluate the preliminarily-chosen species,finally selected 7 species that can be widely applied,and 5 species that can be moderately applied. 相似文献
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不同树龄2种树形库尔勒香梨树的冠层花果分布特性 总被引:1,自引:0,他引:1
为了明确不同树龄和不同树形库尔勒香梨树的花果在树冠中的分布特征,为库尔勒香梨树的科学整形修剪提供理论依据,以12、23、47年生的2种树形(开心形和疏散分层形)库尔勒香梨树作为研究对象,统计并比较了其单花序花数量、单株总花朵和果实的数量及其分布特性的差异性。结果表明,树形对库尔勒香梨花序花量的影响不太明显,而不同树龄库尔勒香梨树的花序花量有明显差异,12、23、47年生库尔勒香梨树的花序花量分别以4朵、7朵、6朵为主。不同树龄疏散分层形树的花数量和花量分布密度均高于开心形树,其中23年生树的差异最大,47年生树的差异不大。不同树龄疏散分层形树的坐果率和果实分布密度也均明显高于开心形,尤其是12、23年生疏散分层形树的果实分布密度比开心形树高几倍到几十倍,而47年生树的差异不太明显。在初果期和盛果期疏散分层形是库尔勒香梨树高产稳产的理想树形,而在老龄期推荐改成开心形。 相似文献
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《Journal of Landscape Research》2017,(1)
By using biological five points,expert consultation and fuzzy comprehensive evaluation,the species,phenological ornamental characteristics,and landscape application of colored-leaf trees in Lhasa City were surveyed systematically. The results show that there are 42 species of colored-leaf trees in Lhasa City,belonging to 31 genera and 18 families,of which there are 5,19,and 18 species of spring,autumn,and common colored-leaf trees,accounting for 11.90%,45.24% and 42.86% of total number of the investigated tree species respectively. It is clearly seen that there are too few species of spring colored-leaf trees in the city. There are 19 and 17 species of trees possessing red and yellow leaves,while the leaves of other 6 species of colored-leaf trees are shown in other colors,and the number of their species accounts for 45.24%,40.48% and 14.28% of total number of the investigated tree species respectively. The best ornamental periods of spring,autumn and common colored-leaf trees in Lhasa City average 38.4,41.8 and 251.8 d respectively. Prunus cerasifera Ehrhar f. atropurpurea Rehd.,Ulmus pumila L.,Populus × beijingensis W. Y. Hsu,and Salix alba are applied most frequently in Lhasa City,and their relative frequency is 18.67%,10.29%,9.91% and 8.95% respectively. According to the comprehensive assessment value of their ornamental characteristics,the ornamental characteristics of 15 species of colored-leaf trees in Lhasa City are good or very good,and there is a positive correlation between the comprehensive assessment value and relative frequency. Based on the investigation,the current application situation and problems of colored-leaf trees in Lhasa City were analyzed,and solutions to the problems were proposed. 相似文献
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Based on the relationship between cities and inhabitants as the main point, the characters, complexity and openness of the urban system are discussed in this paper. Then, the nature of the city is revealed. 相似文献
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为探讨绿化树种量化选择方法,观测计算郑州市常见的16 个乔木树种年生长量、固碳释氧量、固土保肥量、涵养水源量、积累营养量与净化空气功能及其价值,采用聚类与主成分分析法,对不同树种的生态服务价值进行了分析。结果表明:生态价值较高的树种为银杏(Ginkgo biloba)、悬铃木(Platanus acerifolia)、白蜡(Fraxinus chinensis)、国槐(Sophora japonica)与枇杷(Eriobotrya japonica);生态服务价值较低的树种为黄山栾(Koelreuteria bipinnata)、女贞(Ligustrum lucidum)、雪松(Cedrus deodara)、圆柏(Sabina chinensis)与侧柏(Platycladus orientalis);其他树种生态服务价值中等。建议在造林绿化中优先选择生态 服务价值较高的树种。 相似文献