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1、垂枝小叶杨和中华红叶杨快繁技术探究摘要:近年来,我国城市园林绿化行业发展迅猛,对绿化苗木的需求大大增加,而现代园林的快速发展不仅体现在绿化指标的节节攀升,还体现在绿化水平的不断提高上。进入新世纪人们对环境改善的期望越来越高,特别是北方城市,为丰富城市色彩,迫切需要性状优良的彩叶树种。我国近年引进和选育了不少彩叶树种,尤其是紫红色叶类和黄(金)色叶类,如美国红护、日本红枫、红叶石楠、紫叶矮樱、金叶藐、金叶扶藤、金叶刺槐等,这些树种所独有的特色,极大地丰富了城市园林景观,提高了绿化的水平和档次,使一向色彩单调的城市绿化水平得以迅速改善。但纵观当前所使用的彩叶树种,以低矮花灌木
2、居多,乔木树种也多为小乔木,大多存在着体量小或生长速度慢等方面的缺陷,且部分彩叶树种颜色也不够鲜艳。城市绿化建设中,为追求理想的绿化效果,都大量使用规格苗木,或成片群植。而当前一些彩叶树种很难短期内达到要求,要快速形成成片、大体量园林景观和色块难度较大。作为彩叶树种的中红杨不但具备杨树生长速度快、适应性强、繁殖容易的特点,而且叶面颜色鲜艳亮丽,克服了当前彩叶树种的缺陷,可迅速形成大面积、高档次的园林景观。作为世界唯一的高大乔木彩色速生树种,在道路、城市郊区、园林绿化中,可达到“立地成景”的效果,其叶面颜色的多变性,克服了当前彩叶树种的缺陷,可迅速形成大面积、高档次的园林景
3、观。关键词:垂枝小叶杨中华红叶杨快繁技术1AbstroctInrecentyears,ourcountrycitylandscapingindustryisdevelopingrapidly,greatlyincreasedthegreenseedlingsdemand,buttherapiddevelopmentofmodernlandscapearchitectureisnotonlyreflectedinthegreenindexrosesteadily,alsoreflectedinthegreeninglevelincreasing.Enternewcentur
4、ypeopleexpecttoimproveenvironmentismoreandmorehigh,especiallyinthenorthofthecity,citycolorisrich,inurgentneedofexcellenttreespeciestraits・Ourcountryinrecentyears,theintroductionandbreedingofmanytreespecies,especiallyredleavesandyellow(gold)colorleafplant,suchastheUnitedStatesofAmericaredL
5、u,Japanesemaple,Photinia,Prunuscistena,goldleafCaryopteris,goldenleafEuonymusrattan,goldleafacaciatreespecies,theseuniquecharacteristics,greatlyenrichedthecitylandscapegreening,improvethelevelandgrade,hasbeensodrabcitygreeninglevelcanbeimprovedrapidly.Butlookatthecolorfulspecies,mostlylow
6、shrubs,treesaremostlysmalltrees,mostoftheexistenceofdefectssmallerorgrowth,slowspeed,andthepartofcolored-leaftreescolorisnotbright.Inthecity,asthegreeningeffectthepursuitofanideal,alargenumberofseedlings,orthewholegroupplanting・Andthecurrentnumberofcolored-leaftreesaredifficuIttomeetthere
7、quirementsintheshortterm,toquicklyformpiece,biglandscapeandcolorisdifficult・AsthetreespeciesinHongYangnotonlyhasthepoplargrowthspeed,strongadaptability,easypropagationcharacteristics,andleafcolorbright,overcomesthedefectsofthecurrenttreespecies,canquicklyformalargea