城市森林绿地空气负离子生态效益评价研究

对长兴县三种功能类型森林绿地空气负离子浓度进行测定,结果表明:城郊森林绿地的空气负离子浓度为1 823个/cm~3,城区公共绿地为1 296个/cm~3,单位、居住区绿地为958个/cm~3;在森林植物生长期间,空气负离子浓度从城区向城郊呈增加趋势;在郊区以高大乔木为主的近自然林,空气负离子浓度高,生态效应明显。综合上述分析,本文提出应按照近自然森林群落建设理念,推广种植乡土树种、乔木树种,营造城区核心林地,改善城市生态环境,提高城镇居民的生活品质。

The Evaluation on Aero-anion Ecological Efficacy in Urban Forest Land

It was showed by the study on aero-anion concentration in the 3 types of urban forest green land in Changxing city that the aero-anion concentration was 1823 Ions-cm^3 in suburban forest land, 1296 Ions-cm^3 in urban public forest land, 958 Ions·cm^3 in residential forest land. The aero-anion concentration was increasing gradually during the growth period of forests. There were high aero-anion concentration and ecological efficiency in natural type of forest consist of high wood. After all, this paper suggest that, natural type of forest land based on the native trees and woods must be constructed to inprove urban ecological environment and the life quality of urban residents.