基于LUR模型的城市带状绿地冬季降减空气PM_(10)和PM_(2.5)效应研究  

Effects of urban greenbelt on mitigating PM_(10) and PM_(2.5) in winter based on land use regression(LUR)model

作　　者：孙伊湄 朱春阳[1] SUN Yimei;ZHU Chunyang(College of Horticulture&Forestry Sciences,Huazhong Agricultural University,Wuhan 430070,China)

机构地区：[1]华中农业大学园艺林学学院,武汉430070

出　　处：《华中农业大学学报》2024年第6期150-160,共11页Journal of Huazhong Agricultural University

基　　金：国家自然科学基金项目(32371950);中央高校自主创新基金项目(2662022YLYJ005);新疆生产建设兵团财政科技计划项目(2023CB008-24)。

摘　　要：为探究城市带状绿地降减空气颗粒物的作用机制和效应,选取武汉市罗家港带状公园绿地及其周边建成环境作为研究对象,选择冬季天气晴朗无风且气象条件相似的3天进行重复观测,采用土地利用回归(land use regression,LUR)模型和主成分分析相结合的方法,分析冬季城市带状绿地对空气PM_(10)和PM_(2.5)质量浓度的降减效应,识别其关键影响因素。结果显示,基于LUR模型得出城市带状绿地对空气PM_(10)和PM_(2.5)的降减作用存在宽度效应,宽度30~40 m的绿地在冬季对空气PM_(10)的降减效率最显著。同时,研究发现冬季城市带状绿地内部的空气PM_(2.5)和PM_(10)质量浓度会出现高于邻近道路位置的现象,空气PM_(10)和PM_(2.5)在城市带状绿地内存在明显的积聚效应。结果表明,城市带状绿地对空气PM_(10)和PM_(2.5)的降减作用会受到周边交通污染排放的干扰,不同宽度带状绿地创造的微气象条件也会对空气PM_(10)和PM_(2.5)的质量浓度产生一定影响。The green space of Luojiagang Greenbelt Park in Wuhan and its surrounding built environment were used to study the mechanism and effect of urban greenbelts on reducing particulate matter in the air.Three days with clear and windless weather and similar meteorological conditions in winter were repeatedly observed.A combination of land use regression(LUR)model and principal component analysis(PCA)was used to analyze the effect of urban greenbelt on mitigating the concentration of PM_(10) and PM_(2.5) in the air in winter and identify the key influencing factors.The results showed that there was a width effect of urban greenbelt on mitigating the PM_(10) and PM_(2.5) in the air in winter based on the LUR model.The green space with a width of 30-40 meters had the most significant mitigation efficiency of PM_(10) in the air in winter.In winter,the concentration of PM_(10) and PM_(2.5) in the air inside urban greenbelt was higher than that in adjacent road locations.There was a significant accumulation effect of PM_(10) and PM_(2.5) in the air in urban greenbelt.It is indicated that the effect of urban greenbelt on mitigating the PM_(10) and PM_(2.5) in the air was disturbed by emissions of surrounding traffic pollution.The micro-meteorological conditions created by green spaces of different widths can have a certain impact on the concentration of PM_(10) and PM_(2.5) in the air.

关 键 词：城市带状绿地 宽度效应 空气颗粒物 LUR模型 城市交通 

分 类 号：X513[环境科学与工程—环境工程]