南京市区桂花冻害调查与分析

桂花是南京栽培历史比较悠久的常绿阔叶树种。调查了南京市几大公园桂花的冻害情况,结果显示南京市桂花一共有12个品种受冻,冻害等级主要集中在2级,占43%。受冻最多的品种为四季桂,占冻害株数的66%,且大部分为中度受冻以上,嫩叶、上部枝条受害,其他品种冻害株数较少。并讨论了引起桂花冻害的原因及防寒的技术措施,为桂花品种的引种栽培和管理提供了参考资料。

Investigation and Analysis of Freezing Injury of Osmanthus fragrans in Nanjing

As an evergreen broadleaved tree species Osmanthus fragrans has a long cultivation history in Nanjing City.Freezing injury situation of Osmanthus fragrans were investigated between winter of 2007 and spring of 2008 in the main parks of Nanjing.The results showed that 12 cultivars of all were freezing injury in Nanjing,and most of which were in grade 2 freezing injury,accounted for 43%.'Sijigui' was the severest cultivar in 12 freezing injury cultivars and accounted for 66% of all freezing injury trees.And the freezing injury occurred in young leaves and upper branch.For the other cultivars of freezing injury,the injured trees were relatively less.The reasons of Osmanthus fragrans freezing injury and measures of cold protection were also discussed for introduction and management of Osmanthus fragrans in Nanjing.