遮阴对红花檵木观赏特性的影响

以红花檵木(Loropetalum chinense var.rubrum)为研究对象,设置不遮阴、25%遮阴、50%遮阴、75%遮阴4个不同程度的遮阴处理,研究遮阴对红花檵木观赏特性的影响。结果表明,在夏梢生长季,遮阴处理下的红花檵木叶片较全光照条件下大,且随着遮阴时间的延长叶片持续增大,增大效果在50%遮阴处理下达到最大值,因此中度(50%)遮阴是红花檵木叶片生长的最佳光照环境。红花檵木的叶色随遮阴程度的增大和遮阴时间的延长,呈紫红色向绿色方向变化的规律。遮阴引起红花檵木开花时间推迟,累计开花量减少,花径减小,中度和重度(75%)遮阴条件下甚至不开花。说明遮阴对红花檵木的叶色表达和开花不利,损害其观赏价值,因此选择全光照条件作为叶色和花朵观赏的最佳光照环境。

The Influence on Ornamental Characteristics of Loropetalum chinense var. rubrum under Shaded Conditions

The leaves of Loropetalum chinense var. rubrum were used as the research object in this study. The series of illu-mination treatments were set at different levels including full light,25% shade,50% shade and 75% shade,to investigate the ornamental characteristics under shaded conditions. The results indicated that,the leaves of L. chinense var. rubrum grew quicker under shaded conditions than full light conditions in the summer growing season. And the leaf size increased continu-ously with shading prolonging,the maximum increasing effect appeared at 50% shade. So,Moderate(50%) shade light condition was the best light condition of leaf growth. The leaves color of L. chinense var. rubrum turned from amaranth to green with the increasing of shade degree and the extension of shade time. The shade treatment also delayed the flowering time,reduced the amount of accumulative flowers,and the flowers diameter decreased,even no blossom under the condition of moderate and severe(75%) shade,damaged the blossom quantity. So,full light condition was selected as the best light condition of leaf color and flowers appreciating.