曲靖市中心城区街道林木树冠覆盖与森林结构分析

Canopy Cover and Forest Structure Analysis of Street Forest in Qujing

城市森林是城市生态系统的重要组成部分,城市街道的含绿量,直接影响城市的生态功能。本研究对曲靖市中心城区街道森林现状以及建设潜力进行分析,以期找到存在问题及规律,为曲靖市森林城市建设与管理提供科学依据。基于Arcgis 10.7和e Congnition Developer 9.0软件,结合实地调查,对沾益区主要街道林木树冠覆盖与城市森林结构进行全面分析。龙华大道南段树冠覆盖率最高,达40.22%;西平路树冠覆盖率最低,仅6.98%。对40条主要街道的森林结构进行全面调查,共记录到植物45种22科32属。优势乔木中云南樟的重要值最高为9.88%,优势灌木中大叶女贞的重要值最高为12.49%。中心城区主要街道优势乔木的优势性明显,其他乔木植物的频度对重要值的贡献基本均衡。整体表现出随着立木层次的升高,树木数量分布逐渐减少的变化趋势;多数树木冠幅偏小。

Urban Forest is an important part of urban ecosystem.The green content of urban streets directly affects the ecological function of cities.This paper analyzes the present situation and construction potential of street forest in central city of Qujing,in order to find out the existing problems and laws,and to provide scientific basis for the construction and management of Forest City in Qujing.Based on Arcgis 10.7 and e Congnition Developer 9.0,we analyzed the tree canopy cover and urban forest structure in main streets of Zhanyi District.The canopy coverage of the southern section of Longhua Avenue was the highest,reaching 40.22%.The canopy coverage rate of Xiping Road was the lowest,only 6.98%.A total of 45 species,22 families and 32 genera of the forest structure in 40 main streets were recorded.The importance value of Cinnamomum camphora in the dominant trees was 9.88%.The highest importance value of macrophylla in dominant shrubs was 12.49%.The dominant trees in the main streets of the central urban area had obvious dominance,and the frequency of other trees and plants made a balanced contribution to the important values.As a whole,the number distribution of trees decreased with the increase of standing tree level,and the crown width of most trees was smaller.