北京建成区道路绿化空间结构和行道树健康状况  

Spatial Structure and Health Condition of Street Trees in Beijing Built-up Areas

作　　者：郄光发[1,2] 王成[1,2] 

机构地区：[1]中国林业科学研究院林业研究所,北京100091 [2]国家林业局林木培育重点实验室,北京100091

出　　处：《城市环境与城市生态》2011年第4期9-12,共4页Urban Environment & Urban Ecology

基　　金：国家十一五科技支撑专项(2006BAD03A17)

摘　　要：采用实地普查测量方法,定量研究了北京建成区188条道路行道树的树种结构、径级分布、立木层次和健康状况。结果表明,国槐(Sophora japonica)、毛白杨(Populus alba)、银杏(Ginkgo biloba)是建成区主要行道树种,使用量分别占研究区树木总株数的54.7%、13.7%和7.4%。建成区树木平均密度201株/hm2,平均胸径18.5 cm,其中胸径在30 cm以上的大径级树木数量较少,仅占11.9%,而中、小径级树木比例过大1,0 cm≤DBH<20 cm是行道树最集中的径级分布区间。研究区内树木平均高度8.9 m1,5 m以上的高大乔木占树木总株数的6%,由于重度修剪树木比例过大(86.7%),大部分行道树集中分布在5 m≤H<10 m的高度空间。另外,建成区内行道树健康状况整体较好,但也有26.1%的树木健康状况欠佳,林下地表环境和重度修剪对树木健康状况影响较大。The structure and health condition of street trees were investigated by using aerial photograph method in Beijing built-up areas. The species composition, tree DBH （diameter at breast height） , tree stratum and health condi- tion were analyzed. The results showed that Sophora japonica （54.7%） , Populus alba （ 13.7% ） and Ginkgo biloba （7.4%）were the dominant species according to their individual percent of contribution. The average density was 201 tree/hm2 and the average DBH was 18.5 cm in the study area. Nearly 12 percent of trees were classified as big tree （DBH≥50 cm）, and the small trees mainly occupied the range of 10 cm≤DBH 〈 20 cm. In addition, the average height of trees was 8.9 m. Only 6 percent arbors were higher than 15 m, and the pruned trees had a large percent as high as 86.7%. Most of the other arbors were small which mainly accounted for the stratum of 5 m≤H 〈 10 m. Nearly 74 percent trees had good or medium health level, but there were more than 26 percent trees in poor health condition which was influenced by pruning and ground cover greatly.

关 键 词：行道树 空间结构 健康 北京建成区 

分 类 号：S731.2[农业科学—林学]