郑州市中心城区行道树结构特征分析

Structural Characteristics of Roadside Trees in Central Zhengzhou City

采用抽样调查法,对郑州市中心城区145条街道、146个样点的行道树,分市域和城区2个层次对行道树的树种结构、应用频度、多样性、胸径结构、树高、冠幅及季相特征等进行研究,并将新老城区进行对比分析。结果表明:郑州市行道树共有19种,隶属15科18属;新城区行道树树种丰富度总体高于老城区,老城区行道树平均胸径、树高、冠幅大于新城区;新老城区行道树在季相特征上,均以秋季景观为主,夏季次之,春、冬季景观较薄弱,新城区季相结构更合理。提出了增加树种丰富度、控制常绿与落叶树种比例、优化行道树径阶分布、合理配置季相结构分布等改进建议。

By using the method of sampling survey,the structure of tree species,application frequency,diversity,DBH structure,tree height,crown diameter and seasonal characteristics of roadside trees in 145 streets and 146 sample points in the central urban area of Zhengzhou were studied,and the new and old urban areas were compared and analyzed.The results showed that there were 19 species of roadside trees in Zhengzhou,belonging to 18 genera and 15 families.The richness of roadside trees in the new urban area was generally higher than that in the old urban area,and the average DBH,height and crown diameter of roadside trees in the old urban area were larger than that in the new urban area.The roadside trees in the new and old urban areas were dominated by autumn landscape,followed by summer landscape,spring and winter landscapes were weaker,and the seasonal structure in the new urban area was more reasonable.This paper suggested to increase the species richness,control the proportion of evergreen and deciduous species,optimize the diameter distribution,and reasonably allocate the seasonal structure.