基于i-tree模型的城市滨河绿化带生态效益评估——以淮安市古黄河景观带为例

Ecological benefit evaluation of urban waterfront greening based on i-tree model--Taking Huaian ancient Yellow River landscape belt as an example

以江苏省淮安市古黄河风光带某河段作为研究对象,实地普查了该景观绿化带的树种、胸径等资源情况。运用i-tree模型对滨河绿化带的净化空气效益、碳的储存及固碳效益、产氧量和雨水截留效益共4个方面进行了评估。结果表明:该河段绿化带共有树木7 321株,35个树种,其中水杉、桂花、香樟等5个优势树种占树木总量的57.86%。胸径径级分布以中小胸径( 10~ 20 cm)为主。总生态效益为79 363.49美元,碳储量的效益最高,占总效益的82.32%。其次是固碳效益、净化空气效益、截留雨水效益、产氧效益。水杉的生态效益最高,占总效益的21%。单株加权平均效益的大小排序为榔榆、银杏、榉树、乌桕。本研究为城市管理者如何优化城市滨水区树木管理提供参考。

Taking a section of the ancient Yellow River Scenic Belt in Huai an City of Jiangsu Province as the research object,the resources such as tree species and DBH of the landscape green belt were investigated.The benefits of air purification,carbon storage and sequestration,oxygen production and rainwater interception of riverside green belt were evaluated by i-tree model.The results show that there are 7321 trees and 35 tree species in the green belt of this river section,of which 5 species are dominant species,such as Metasequoia glyptostroboides,Osmanthus and Cinnamomum camphora,accounting for 57.86%of the total trees.The distribution of DBH was mainly small and medium DBH(10~20 cm).The total ecological benefit is 79363.49 US dollars,and the carbon storage is the highest,accounting for 82.32%of the total benefit.The second is carbon sequestration,air purification,rainwater interception and oxygen production.The ecological benefit of Metasequoia glyptostroboides is the highest,accounting for 21%of the total benefit.The order of weighted average benefit per plant was Ulmus parvifolia,Ginkgo biloba,Zelkova serrata and Sapium sabiferum.This study provides a reference for urban managers to optimize tree management in urban waterfront.