<正>对宜昌市6种具有代表性绿地类型(包括对照)的大气污染因子SO2、NOx、TSP进行对比监测,并采用模糊数学方法对不同绿地类型大气环境质量进行综合评价。结果表明,所研究的6种绿地类型中,按照国家大气环境质量标准属Ⅰ级的有3种,属Ⅱ级的有3种,表明宜昌市大气质量总体上表现良好。6种类型的大气环境质量存在着明显的差异,这种差异性与绿地类型的垂直结构、绿体含量有密切关系,其中具有乔灌草立体结构、绿体含量高的绿地类型表现出较好的滞尘效应和吸收大气有害气体效应,因而环境空气质量较好;而结构单一,绿量小的绿地类型净化大气功能明显下降,环境空气质量则相对较差。

SO2,NOx and TSP,which are factors of air pollution in six types of typical greenland in Yichang city were contrastively monitored.Fuzzy mathematics methods were taken to comprehensively assess the air environmental quality of different types of landscape.This result showed that there were three types of greenland belonging to level Ⅰ,two types of greenland belonging to level Ⅱ,but no one belonging to level Ⅲ and level Ⅳ in the five types of greenland,according to national standard of air environmental quality.This result indicated that the air environmental quality of Yichang city was good on the whole.There was significant difference in air environmental quality among the six types of greenland.The difference was closely related to the vertical structure of the plantation and to the total leaf areas in a definite greenland.Greenland types with a structure of arborshrubherb had better effect on dust detention and detrimental gas absorption.But Greenland types with unitary structure and less total leaf areas,such as lawn and afforesting zone along streets,and so on,had obviously worse effect of air purification,and the air quality was relatively worse,compared to that of the former.