保定市城市森林结构特征分析

Urban forest structure characteristics of Baoding city

为了认识保定市城市森林结构特征,进而为保定市城市森林的建设提供指导和依据,采用抽样调查的方法,对保定市106 km2范围的树木进行了每木实地调查。对城市森林面积、树木的种类组成、高度、径阶、健康状况、叶面积指数等结构特征进行分析。结果显示:研究区大约有197.4万株树,其中乔木169.84万株,灌木27.56万株;16种主要树种占树木总量的60.24%;大约71.5%的树木属于小径木(胸径<10 cm);61.4%的树木健康状况属于一般以上。因此,保定市城市森林总体水平不高。

Measuring the urban forest is an important first step toward understanding the dynamics of urban forests and a prerequisite for planning,designing,and managing city vegetation. Investigations were made in the sampling plots covering 106 km^2 of the Baoding urban area,and the results showed that there are 1974 thousand trees in the Study area. Meanwhile the urban forest area,species composition,DBH classes, health condition, LAI of the tree community for different urban forest types were analyzed. In the urban forest of Baoding city, 16 top species occupy almost 60.24% of tree individuals; almost 71.5 % of trees are classified as small-diameter tree（DBH〈 10 cm） ;most of trees（61.4 % ）are of average or above-average health. Therefore, the general level of urban forest is relatively low.