【摘要】 乔木冠层遮光是决定中下层植被光照环境的关键因素,遮光效果受不同层次空间特征的影响存在一定的差异。文章以南京市华东地区常见景观乔木为调查对象,分析单株、群植和建筑环境等不同条件下的乔木遮光率特征,结果显示:受调查树种的平均遮光率为91. 84%,常绿树种整体大于落叶树种;种内差异与规格具有显著关联,且以正相关为主;群植遮光率普遍大于单株,增大幅度与构成树种和组合结构相关;建筑周边小环境的变化对乔木遮光率会产生不同的影响,其本身的遮光效果与落叶单株的平均水平相当。更多还原

【Abstract】 Tree canopy shading is a key factor that determines the light environment of the middle-and lower-layer vegetation in a community. There are some differences in shading effects due to the influence of spatial characteristics at different levels. The paper analyzes the characteristics of shading rate of trees under different conditions including single plant,group planting,and building environmental impact by investigating the landscape tree species in Nanjing City that are also commonly seen in Eastern China. The results show that the average shading rate of the investigated tree species is 91. 84%,and the shading rate of evergreen tree species are generally larger than that of the deciduous ones; differences in one species are significantly related to specifications and mostly in positive correlations; the shading rate of group planting is generally greater than that of single plant,and the increase is related to the composition of tree species and group planting structure; the changes in the micro-environment surrounding a building can have different effects on the tree shading rate,and the effect of building shading is equivalent to the average level of single planted deciduous tree.更多还原