遮荫处理对红叶石楠和洒金桃叶珊瑚光合特性的影响  

Effects of shading on photosynthesis characteristics of Photinia × frasery and Aucuba japonica var. variegata

作　　者：张聪颖[1] 方炎明[1] 姬红利[1] 马成涛[1] 

机构地区：[1]南京林业大学森林资源与环境学院,南京210037

出　　处：《应用生态学报》2011年第7期1743-1749,共7页Chinese Journal of Applied Ecology

基　　金："十一五"国家科技支撑计划项目(2006BAD03A0507-2);浙江省丽水市技术开发项目(2008-2012)资助

摘　　要：研究不同遮荫处理(透光率分别为20%、40%、60%、100%)对红叶石楠和洒金桃叶珊瑚两种观叶植物光合特性的影响.结果表明:遮荫处理6周后,与遮荫状态下原位测定相比,自然状态下两种植物异位测定的光合作用增强,随着遮荫程度的增强,叶片净光合速率呈增大趋势,红叶石楠和洒金桃叶珊瑚的最大值分别为9.7和8.3μmol.m-2.s-1;两种植物的蒸腾速率显著提高.遮荫处理不同程度地提高了两种植物叶片叶绿素a、b含量、叶绿素a+b总量及叶绿素/类胡萝卜素值,降低了叶绿素a/b值,但类胡萝卜素含量无显著变化.在自然状态下,红叶石楠净光合速率和蒸腾速率的表型可塑性指数(PPI)分别为2.08和3.21;洒金桃叶珊瑚的相应指标仅为0.55和1.60.两种植物的叶绿素和类胡萝卜素含量相对稳定,受外界环境因子影响相对较小.洒金桃叶珊瑚的耐荫性高于红叶石楠.This paper studied the effects of different shading（light transmittance 20%,40%,60%,and 100%） on the photosynthesis characteristics of two ornamental foliage plants Photinia × frasery and Aucuba japonica var.variegata.After shading for six weeks,the net photosynthesis rates of two plants measured ex situ under natural light enhanced,compared to those measured in situ,and,with the increase of shading degree,the net photosynthetic rates had an increasing trend,with the maximum being 9.7 μmol·m-2·s-1 for Photinia × frasery and 8.3 μmol·m-2·s-1 for Aucuba japonica var.variegata.In the meantime,the transpiration rates of the two plants increased significantly.Shading increased the chlorophyll a,b,and a＋b contents and the chlorophyll/carotenoids ratio,decreased the chlorophyll a/b,but less affected the carotenoids content.The phenotypic plasticity index（PPI） of net photosynthesis rate and transpiration rate of Photinia × frasery and Aucuba japonica var.variegate was 2.08 and 3.21,and 0.55 and 1.60,respectively.The chlorophyll and carotenoids contents of the two plants were relatively stable,indicating the minor influence of external environment factors on pigments.Aucuba japonica var.variegata had a higher shading tolerance than Photinia × frasery.

关 键 词：红叶石楠 洒金桃叶珊瑚 遮荫处理 光合特性 表型可塑性指数 

分 类 号：S687[农业科学—观赏园艺]