广州城市道路分车带绿化调查     

朱文峰 《广东园林》2015,(3)

通过调查广州12条主要道路中央及两侧分车绿化带的树种选择、植物群落配置、景观营造、色彩搭配、绿化功能的合理性等,得出:1)每条道路平均配置5.5种植物,其中乔木2.17种,灌木2.5种,草本0.92种,平均乔灌比0.87;2)配置模式主要是乔木+灌木+地被、乔木+灌木绿篱、乔木+地被和灌木+地被4种形式。  相似文献   

浅谈河北地区城市道路绿化的发展——以河北张家口市为例     

温亚利 《农业科技与信息》2011,(2)

道路绿化是城市园林绿化的重要组成部分。本文通过笔者所在城市道路绿化发展的概述,总结分析了城市道路绿化发展的四个阶段,以及现今存在的问题和未来的发展方向。  相似文献   

天河公园“拆围透绿”工程边界空间绿化模式研究   总被引：1，自引：1，他引：0       下载免费PDF全文

方永红  王盾＊ 《广东园林》2023,(1):70-73

边界空间绿化是开放性城市公园的重要因素,是衔接公园与城市绿地系统的重要措施。以广州天河公园“拆围透绿”工程为例,分析边界空间绿化存在通透性不足、与城市融合度不高、地域文化缺失、绿地管理不到位等问题,采用“保留、清杂、复绿”景观策略,确定点状、带状、片状景观3种绿化模式,制定“护栏+绿化”、绿化组团、“微地形+绿化组团”3种空间分隔手法,并从复绿植物种类选择、通透植物空间结构、活化林下消极空间、柔化公园边界空间、强化城市地域文化、加强空间绿化管理6个方面进行绿化提升,优化了公园的生态环境和开放性。  相似文献   

Frequency of symptomatic trees removal in small citrus blocks on citrus huanglongbing epidemics     

《Crop Protection》2013

Among the recommended measures for citrus Huanglongbing (HLB) management, the systematic elimination of symptomatic trees is the most argued and difficult to be accepted and accomplished by citrus growers. Elimination of recently affected HLB trees represents a short term yield loss and cost increase due to the need of frequent inspections and removal operations. This work aimed to evaluate the effect of different frequencies of inoculum reduction applied at individual citrus blocks scale (or local inoculum reduction) on HLB temporal progress. Eight experiments were carried out in new planted and older citrus blocks with 504–1290 trees/plot. In all experiments, inspections to detect symptomatic trees were done in a fortnightly or monthly frequency. The treatments of frequencies of local inoculum reduction varied from fortnightly to 6 months. Annual disease progress rate was estimated by logistic model for each plot. No difference on HLB progress rates among treatments was observed, except in experiments 1 and 3 where less frequent tree removal resulted in higher disease progress rate. This ineffectiveness of local inoculum reduction on the disease progress rate was explained by the higher weight of primary spread on HLB epidemics than the secondary spread within plots associated with small size and narrow shape of treated plots (except for experiments 1 and 3), high dispersal capacity of HLB-insect vector among plots and groves, and strong control of psyllid within the plots (except for experiment 1, with poor insecticide spray program). Also, the high amount of inspections to detect symptomatic trees before the eradication treatment, which reduced the escapes (asymptomatic and non visual detectable diseased trees) contributed for these results. It is important to note that these results were obtained with only small citrus plots (0.8–2.9 ha) and they cannot be extended to larger groves and farms amenable to HLB management by the symptomatic tree removal and vector control.  相似文献   

南昌市道路绿化树种调查分析与建议     

尤春波  陈卫军  章晴  李莲芳 《河南林业科技》2013,33(1):29-31,62

通过对南昌市道路主要绿化树种种类、使用频率及长势进行调查,并对存在的问题进行分析与探讨,同时根据南昌市的实际情况,提出了几点建议和措施。  相似文献   

Ineffectiveness of pruning to control citrus huanglongbing caused by <Emphasis Type="Italic">Candidatus</Emphasis> Liberibacter americanus     

Silvio Aparecido Lopes  Guilherme Fernando Frare  Pedro Takao Yamamoto  Antonio Juliano Ayres  José Carlos Barbosa 《European journal of plant pathology / European Foundation for Plant Pathology》2007,119(4):463-468

The huanglongbing (HLB) disease of citrus trees, caused by Candidatus Liberibacter asiaticus and Ca. Liberibacter americanus, was first reported in Brazil in March, 2004. The presence of the disease has caused serious concerns among growers. Pruning experiments were conducted to determine if removal of symptomatic branches or the entire canopy (decapitation) would eliminate infected tissues and save HLB-affected trees. Pruning was done in five blocks on a total of 592 3- to 16 year-old ‘Valência’, ‘Hamlin’ or ‘Pêra’ sweet orange trees showing no symptoms or with two levels of symptom severity. Ten decapitated trees per block were caged and all trees were treated with insecticides to control the psyllid vector, Diaphorina citri. Mottled leaves reappeared on most symptomatic (69.2%) as well on some asymptomatic (7.6%) pruned trees, regardless of age, variety, and pruning procedure. Presence of the pathogen (Ca. Liberibacter americanus) in all symptomatic trees was confirmed by PCR. In general, the greater the symptom severity before pruning the lower the percentage of trees that remained asymptomatic after pruning.  相似文献   

合(肥)——武(汉)铁路安徽段高速铁路景观生态绿化模式探讨   总被引：1，自引：0，他引：1  

张卓锋 《农业科技与信息》2009,(6)

合(肥)——武(汉)铁路安徽段是沪、汉、蓉通道的重要组成部分,路线全长212.3公里。在生态护坡的设计上,通过分段进行具体绿化模式设计。植物选择上注重植物层次的搭配,和季节颜色差异布局规划,创造不同层次、不同环境空间的路基绿化效果,为实现合(肥)——武(汉)铁路安徽段的环境保护、生态恢复和景观美化奠定基础。  相似文献   

我国大树移植的现状与对策   总被引：8，自引：0，他引：8  

贺漫媚  杨伟儿  张乔松 《广东园林》2006,28(2):29-34

上世纪未,伴随我国城市建设和城市绿化高速发展而来的滥挖滥移大树的歪风吹遍中华大地,使我国脆弱的生态系统雪上加霜,严重破坏了大树原生地的生态环境,制造了一大堆城市“景观垃圾”,同时也突显了我国苗圃技术和苗圃建设严重滞后的现实。几年以来,作者利用工作之便,对广东、浙江、上海、福建、海南、湖南等地的部分苗圃和城市绿地就“大树移植”问题进行了调研,收集了大量的资料、数据和现场照片;着重分析了这股歪风的缘起、发展和危害;并就如何解决这一问题作了深入的探讨,提出了一些对策和建议。  相似文献   

论成都市城市绿化与城市生态安全     

唐颖  陈其兵 《四川林业科技》2007,28(1):118-121,28

通过分析城市绿化与城市生态安全的关系,并结合成都市绿化现存的问题,提出加强城市绿化建设,确保城市生态安全的建议与对策,为成都市生态安全建设提供科学依据。  相似文献   

南昌市道路绿化树种选择   总被引：6，自引：0，他引：6  

杨帆  刘细燕  何素琳  王海霞 《江西林业科技》2005,(5):45-46,63

通过对南昌市城市道路绿化中存在问题的分析，结合21世纪城市道路绿化树种选择的要求，提出完善和改进该市道路绿化的措施和建议。  相似文献