南京市主要绿化树种对大气固体悬浮物净化能力及规律研究

Dustfall Adsorbing Capacity of Major Species of Greening Trees in Nanjing and Its Law

摘要: 对南京市不同功能绿地类型的26种主要绿化树种净化大气固体悬浮物的能力进行监测分析,研究不同功能区主要树种叶片滞尘量的季节变化,应用SAS软件,综合考虑单位面积滞尘量、单叶滞尘量、干重滞尘量3种指标对绿化树种滞尘能力进行聚类评估。结果表明,大部分绿化树种叶片滞尘量的季节变化为春季高、夏季降低、秋季增高、冬季达最高,这与空气中悬浮颗粒物含量季节变化的规律相一致;同一树种在不同地点的叶片滞尘量可以反映树木所在环境空气质量,灵谷寺公园和栖霞山空气质量优于梅山钢铁厂和宁镇公路;不同树木类型间滞尘能力差异较大,灌木滞尘量最大,常绿乔木其次,落叶乔木最小。

Abstract: Dustfall adsorbing capacities of 26 major species of greening trees in different functional zones in Nanjing were monitored and analyzed.Results show that dustfall adsorbing capacity varied from species to species,and displayed a seasonal trend,high in spring,low in summer,high again in autumn,and highest in winter,and a decreasing order of shrubs>evergreen arbors>deciduous arbors.The amount of dustfall on the leaves increased with the time.