摘要
为深入探究不同类型城市绿地植被提供的三维绿量及生态效益价值的不同,本文以西安市主城区作为研究区域,实地调研 15 个公园绿地、28 个社区绿地和 26 个街头绿地共 90 个样方,对调查区内主要树种及不同城市绿地类型的三维绿量以及生态效益等指标进行分析.结果表明:①主要树种中三球悬铃木(Platanus orientalis)产生的三维绿量和生态效益最高.②常绿乔木三维绿量贡献率显著低于落叶乔木(P＜0.05).③3 种不同类型的绿地单位面积三维绿量从大到小依次为街头绿地(31 835.50 m3)、公园绿地(30 351.50 m3)、社区绿地(24 956.75 m3).④3 种绿地的单位面积年生态效益价值以吸收CO2 量最高,其次是释放O2 量、夏季蒸腾量和滞尘量,吸收SO2 量最低.研究显示,基于西安市常绿树种较落叶树种种植面积偏低,在该区域的城市绿化应适度增加常绿树种的种植比例;此外,落叶树种多采用三球悬铃木、槐(Styphnolobium japonicum)等高大宽阔的树种,可有效提高西安市城市绿地三维绿量和生态效益.
Abstract
In order to explore the differences in three-dimensional green volume and the ecological benefit value provided by different types of urban green spaces,this study focused on the main urban area of Xi'an City.A total of 90 quadrats were surveyed across 15 park green spaces,28 community green spaces,and 26 street green spaces.The three-dimensional green volume and ecological benefits of the major tree species and different urban green space types were analyzed.The results showed that:(1)Among the main tree species,the three-dimensional green volume and ecological benefits produced by Platanus orientalis were the highest.(2)Compared with deciduous trees,evergreen trees contributed significantly less to the total three-dimensional green volume(P＜0.05).(3)The three-dimensional green volume per unit area,from largest to smallest,was street green space(31,835.50 m3),park green space(30,351.50 m3),and community green space(24,956.75 m3).(4)CO2 absorption yielded the highest ecological benefit per unit area per year,followed by O2 release,summer transpiration,dust retention,and SO2 absorbed was the lowest.Research indicates that due to the lower area of evergreen species compared to deciduous species in Xi'an City,it may be beneficial to moderately increase the proportion of evergreen trees in the city's greening efforts.In addition,most of the deciduous tree species,such as Platanus orientalis and Styphnolobium japonicum,are tall with broad canopies,which can effectively enhance the three-dimensional green volume and ecological benefits of Xi'an's urban green spaces.
维普
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