遮阴对10种野生观赏植物生长及生理特性的影响

为了探讨野生观赏植物在遮阴条件下的生态适应性及寻求适度的遮阴比例,选取兰州地区10种野生观赏植物为试验材料,比较测定不同光强生境(全光照、25%、50%、70%遮光率)对10种野生观赏植物生长和生理生化的影响。结果表明,角茴香(Hypecoum erectum)和驴蹄草(Caltha palustris)含水率随着遮阴度的增加而增加,小花草玉梅(Anemone rivularis)在75%遮阴度时干重最大,显著高于其余遮阴处理及全光照(CK)(P0.05);藤本铁线莲(Clematis florida)可溶性糖含量随着遮阴度的增加而减少,鹅绒委陵菜(Potentilla anserina)、角茴香、水杨梅(Geum aleppicum)和驴蹄草的叶绿素含量随着遮阴度的增加而增加;东方草莓(Fragaria orientalis)、角茴香和驴蹄草在全光照下丙二醛的含量显著高于其它处理(P0.05),香青(Anaphalis sinica)和水杨梅在75%遮阴度下丙二醛含量较高。综上所述,香青、莓叶委陵菜(Potentilla chinensis)、藤本铁线莲和野棉花(A.vitifolia)比较适合全光照生长;鹅绒委陵菜、小花草玉梅、东方草莓、角茴香和水杨梅可以忍耐适当的遮阴环境;驴蹄草适合在遮阴条件下生长。

Effect of shades on growth and physiological characteristics of 10 species of wild ornamental plants in Lanzhou

To investigate the ecological adaptability of wild flower under different shade conditions and seek appropriate shading proportions,the effects of different light intensity (full light,25％,50％,70％ shading) were tested on the growth and physiological and biochemical characteristics of 10 species of wild ornamental plants around Lanzhou City.The results showed that water content increased with the increase of shading on Hypecoum erectum and Caltha palustris.The dry weight of Anemone rivularis was higher in 75％ shading,and the difference was significant compared with the other treatments (P＜0.05).Soluble sugar content decreased with increasing shading on Clematis florida,and chlorophyll content of P.anserine,H.erectum,Geum aleppicum,and C.palustris increased with increasing shading.The content of MDA was significantly higher than other treatments (P＜0.05) under full light condition in F.orientalis,H.erectum,and C.palustris.Similarly,MDA contents of Anaphalis sinica and G.aleppicum in 75％ shading were higher than other treatments.To sum up,full light was more suitable for the growth of A.sinica,P.chinensis,C.florida and A.viti folia;P.anserine,A.rivularis,F.orientalis,H.erectum,and G.aleppicum could endure moderate shading;C.palustris was suitable for growing under shading condition.