青冈栎等6种林木种子耐脱水性研究

研究了脱水对青冈栎(Cyclobalanopsis glauca)、山杜英(Elaeocarpus sylvestris)、无患子(Sapindusmukorossi)、观光木(Tsoongiodendron odorum)、香叶树(Lindera communis)和金叶含笑(Michelia foveolata)等6种林木种子浸出液相对电导率、发芽率和发芽指数的影响。结果表明:除无患子外,随脱水时间的延长,其他5个树种种子浸出液相对电导率均有逐渐升高的趋势,发芽指数有比较显著的下降;随着脱水程度的不断加深,6个树种种子的发芽率均有下降的趋势,但树种不同,种子发芽率下降程度和下降过程均有很大差别。6个树种中,无患子种子可归为次正常性种子,其他5个树种种子介于正常性与顽拗性之间,其中青冈栎的耐脱水性最高,山杜英次之,观光木、金叶含笑和香叶树的耐脱水性较差。

Studies on Seed Desiccation Tolerance of Six Tree Species

The effects of desiccation on relative electrical conductivity,germination percentage and germination indexes of Cyclobalanopsis glauca,Elaeocarpus sylvestris,Sapindus mukorossi,Tsoongiodendron odorum,Lindera communis and Michelia foveolata seeds were studied.The results showed that except for S.mukorossi,the relative electrical conductivity of other five species has a gradual increasing trend and their germination indexes have a significant decrease with the prolonging period of desiccation.The seed germination percentage of all six species has a trend of decrease with the bitter of desiccation,but the extent and process of reduction is quite different.Among the species studied,S.mukorossi can be classified as sub-orthodox seeds.The other five species are between orthodox and recalcitrant seeds.Among them,C.glauca is the most tolerant species to desiccation,Elaeocarpus sylvestris is the second.The desiccation tolerance of T.odorum,M.foveolata and L.communis is not so good.