合肥市行道树生态效益研究

Study on Ecological Benefits of Street trees In Hefei city

按道路长度的10%抽样调查合肥市市区100km2范围主要道路行道树现状,运用I-tree软件分析行道树结构,估算行道树生态经济效益,包括截留雨水、吸收CO2、改善大气质量、提供美学价值及储碳功能。研究结果表明:研究区主要道路行道树16种,计38800余株,其中香樟、广玉兰、二球悬铃木、国槐4个树种占行道树总数的68.7%;94.5%的行道树评为健康,显示总体健康状况较好,作为合肥市树的广玉兰因管护问题健康状况不佳;行道树中胸径<15cm的小树比例高达64.6%,大多是近年道路改造后栽植。行道树发挥的年生态效益5145.8万元,其中截留雨水的效益占89%,另外储碳效益759.3万元;单株效益最高的是二球悬铃木,其次是栾树、国槐、乌桕,因这些树种胸径>30cm的树木比例较高。分析行道树的结构与功能可为行道树规划、建设、管理提供必要的参考。

Sampling method was employed to Investigate street trees within Second Ring Road in Hefei City; the study area covers about 100 km^2. Based on the field data, the I-Tree software, developed by USDA Forest Service Research, State and Private Forestry, and other cooperators, was run to analyze street trees＇ structure and calculate their ecological and economic benefits, which Including storm water interception, sequestered CO2 from atmosphere, air quality Improvement, aesthetic benefits and CO2 storage. The results showed that there were 16 street tree species Cinnamomum campora, Magnolia In the study area, and total about 38852 Individuals, the 4 species of grandiflora, Platanus acerifolia and Sophora japonica reached 68.7% of street tree population; 94.5% of street tree was evaluated as health, but the health situation of Magnolia grandiflora being named as city tree was lower then average; the proportion of small trees （dbh〈15 cm） reached to 64.6% of street tree population, they were planted In the recent years. Total 51.45 millions of economical benefit the street trees produced annually was accounted, among 89% was from rainfallIntercept by tree canopy; the benefit of C storage of biomass was evaluated as 7.59 millions RMB; The highest value of ecological benefit for anIndividual tree was produced by Platanus acerifolia, then Koelreuteria paniculata, Sophora japonica and Sapium sebiferumln order, because these 4 species have had more big trees （dbh〉30 cm）. Analysis and understanding of street tree structure was essential for street tree planning, planting and management.