泰安地区4个常绿阔叶绿化树种耐寒性综合评价

A Comprehensive Evaluation of Cold-tolerance of Four Evergreen Broad-leaved Greening Species in Tai'an

探讨常绿阔叶绿化树种耐寒性机理,为进一步扩大引种和生产应用提供科学依据,以4个常绿阔叶绿化树种为试材,观察记录越冬形态表现,测定电解质外渗率并拟合Logistic方程求LT50,研究低温对渗透调节物质、POD活性等生理生化指标的影响。结果表明,随着低温胁迫加剧,电解质外渗率呈增加趋势,POD活性及可溶性糖表现出先升后降的趋势,游离脯氨酸表现出"升—降—升"的趋势。运用隶属函数法进行综合评价,这4个常绿阔叶绿化树种的耐寒性顺序为:日本女贞>蚊母树>珊瑚树>枇杷。

The study was performed to explore cold-tolerance mechanism of evergreen broad-leaved greening species.The purpose was to provide scientific basis for expanding the introduction and productive applications.Four evergreen broad-leaved greening species were used as test materials.Overwintering form performances were observed and recorded,lethal temperature 50 (LT 50) was calculated with logistic formula through determining electrolyte leakage rate.Influences of cold stress on osmotic regulation substances and POD activity were investigated.The results showed that:with cold stress increased,electrolyte leakage rate increased,POD activity and soluble sugar contents decreased after an initial increase,proline contents presented an 'ascend-descend-ascend' trend.By using fuzzy mathematics method,the cold-tolerance of four evergreen broad-leaved greening species was evaluated as:Ligustrum japonicum,Distylium racemosum,Viburnum odoratissimum,Eriobotrya japonica.