景天新品种的引种栽培及适应性研究.pdf

景天新品种的引种栽培及适应性研究’ 余莉1’2 陈引珍3 董丽1① 摘要对引种栽培的八宝景天新品种的生长发育规律、不同光照、土壤和土壤水分胁迫反应进行了研究，结 果表明该品种能够在北京地区正常生长发育，同时表现出较好的观赏性状。遮荫导致植株倒伏，说明其不耐 荫蔽，同时对土壤肥力变化不敏感，并耐土壤瘠薄和盐碱。土壤水分胁迫下该品种根冠比减小，细胞膜透性 不断增大，24d左右叶片出现萎蔫现象，叶片MDA含量先下降后上升，SOD活性先上升后下降，而CAT活 性变化规律不显著。胁迫72d后逐渐死亡，表现出很强的抗旱性，是一种良好的园林绿化植物。 关键词景天；引种栽培；适应性 onCultivationand ofaNewIntroducedSedumCultivar Study Adaptability Yin．zhen3DONGLil YULil，一CHEN Architecture，Belting (1College02Landscape ForestryUniversity，＆洳lg100083； BeiLinSince—Trade 100084；3 2Yuanndngyuanmanegerm*nt，咖lg Company，呐100083) of AbstractThe W88conductedwith irradianeeandsoil waterstress8 experiment growthrule。different fertilitylevels，soil newSedumintroducedculfivar,Theresults thattbeculfivarcould andshOW ornRmellt8]featuresin suggested grownormally good failedin soil soil sailInwater andw88n’tsensitiveto couldstand and Beijing．1heplant shading fertility．whichpoor fertility root／shootrationreducedandthecellmembranewaft towiltin24d’11leMDA stress．the leakageincreasing．7nlebegan plant riaed of died content rise珏e ofs0D the thatCAT no dropfirst，then activity drop，while changedregulation．弧eplant grad． in72d the w∞8excellent behaving gree