绣球属植物迁地保育对环境响应的研究

Response of Hydrangea ex situ conservation to environment

为了探讨绣球属植物对迁地保育环境的影响,选取斯特拉特福德绣球(Stratford)和德国八仙花(Todi)为研究对象,研究了温度和光照对2个绣球属植物生理和形态的影响。结果表明,4种温度和光照条件下Stratford的光合作用都强于Todi,高温高光、高温低光和低温高光作用下Stratford的气孔导度大于Todi,高温高光、高温低光和低温低光作用下Todi的蒸腾速率高于Stratford;Stratford的比叶重对高光较为敏感,而Stratford的根冠比在不同温度和光照作用下都低于Todi。不同温度和光照作用下Stratford的气孔面积都低于Todi,而气孔密度都高于Todi。外界环境的变化会对绣球属植物的生理功能产生明显影响,Stratford的可塑性指标光合作用、气孔导度、蒸腾速率相对较小,自身调节能力较强,更能接受外界环境的变化,在遇到环境变化时生理特征会更加平稳,存活能力和环境适应性相对Todi更强。

In order to explore the effects of Hydrangea on ex situ conservation environment,the effects of temperature and light on physiology and morphology of two Hydrangea species,Stratford and Todi,were studied.The results showed that the photosynthesis of Stratford was stronger than that of Todi under four temperature and light conditions.The stomatal conductance of Stratford was higher than that of Todi under high temperature and high light,high temperature and low light and low temperature and high light.The tran⁃spiration rate of Todi was higher than that of Stratford under high temperature and high light,high temperature and low light and low temperature and low light;the specific leaf weight of Stratford was more sensitive to high light,while the root top ratio of Stratford was lower than that of Todi under different temperature and light.The stomatal area of Stratford was lower than that of Todi,but the stoma⁃tal density of Stratford was higher than that of Todi.The plasticity indexes photosynthesis,stomatal conductance and transpiration rate of Stratford were relatively small,and its self-regulation ability was stronger.It was more receptive to the changes of the external envi⁃ronment.When encountering environmental changes,its physiological characteristics would be more stable,and its survival ability and environmental adaptability were stronger than Todi.