不同楸树品种的抗旱性鉴定  

Drought resistance in seedlings of Catalpa bungei cultivars

作　　者：王改萍[1] 岑显超[1] 彭方仁[1] 杨红宁[1] 

机构地区：[1]南京林业大学森林资源与环境学院,江苏南京210037

出　　处：《浙江林学院学报》2009年第6期815-821,共7页Journal of Zhejiang Forestry College

基　　金："十一五"国家科学技术支撑计划项目(2006BAD24B08);江苏省高技术项目(BG2006319)

摘　　要：利用人工气候室模拟干旱胁迫环境研究了7个楸树Catalpa bungei品种和梓树C.ovata的生长指标和生理生化指标,旨在研究楸树抗旱特性。供试材料为各品种的1年生扦插苗,分别在4种不同聚乙二醇(PEG)6000质量浓度0(ck),40,80和120g·L-1下进行处理,研究与抗旱性相关的生长及生理指标的差异性,并利用隶属函数法及系统聚类分析法对楸树进行了抗旱性的综合评价。实验结果表明,抗旱性较强的为光叶楸、梓树和金丝楸,其次为周楸2号和南阳楸,而楸树原种、圆基长果楸和豫楸1号的抗旱性最弱。且发现抗旱能力中等的周楸2号和南阳楸随水分胁迫强度的增加,其抗旱能力逐渐降低,但其他树种的抗旱性在不同水分强度下表现基本一致。从隶属函数以及聚类分析结果的一致性来看,40和80g·L-1PEG6000处理的结果更适合对楸树抗旱性的评价。In order to provide a theoretical foundation for afforestation in arid and semi,arid regions and to exploit the Catalpa resource, drought resistance in one-year-old seedlings of 7 cuhivars of Catalpa btmgei and C. ovata were studied using a completely random design with treatments of 0, 40, 80, and 120 g·L^-1 and three replications by applying simulated drought stress with PEG 6000. Using method of subordinate function and a system cluster analysis, growth and physiological indexes related to drought resistance were measured and evaluated. Results showed that ＇Guangye＇and ＇Ginsi＇ cuhivars, and C. ovata had higher drought resistance followed by ＇Zhou 2＇ and ＇Nanyang＇ and finally the stock,＇Yuanchang＇ , and ＇Yu 1＇ Drought resistance of ＇Zhou 2＇ and ＇Nanyang＇ decreased with the increasing drought stress, but drought resistance of the other cultivars were not greatly changing in any content of drought stress. The method of subordinate function and system cluster analysis revealed that 40 and 80 g·L^-1 PEG 6000 were suitable for evaluation of drought resistance with C. bungei in the seedling stage.

关 键 词：树木生理学 楸树 抗旱性 隶属函数 聚类分析 

分 类 号：S718.43[农业科学—林学]