百里杜鹃森林公园杜鹃盛开期大气颗粒物浓度变化特征

Changing Features of Atmospheric Particulate Matter Concentration in Azalea Blooming Period in Baili Azalea Forest Park

为探索百里杜鹃森林公园杜鹃盛开期大气颗粒物浓度变化征,选择3月下旬晴朗天,对百里杜鹃国家森林公园普底景区空旷地、林内游憩地、林缘游憩地3类游憩地8个监测点的大气颗粒物(TSP、PM10、PM2.5、PM1.0)浓度、气象因子等数据进行采集分析。研究了园内大气颗粒物浓度日变化规律、不同类型游憩地大气颗粒物浓度变化规律及大气颗粒物浓度变化与气候因子、游客游览行为的相关性。结果表明:1)园内大粒径大气颗粒物(TSP、PM10)浓度日变化规律均为上午和傍晚高中午低,呈"双峰单谷"的"U"字型、"V"字型;小粒径大气颗粒物(PM2.5和PM1.0)浓度呈现出早高,午后傍晚低的"L"字形;2)园内8个监测点4种粒径颗粒物日均浓度皆低于Ⅰ级标准,空气质量优;3)园内大气颗粒物浓度从低到高的游憩地类型依次为空旷地、林内游憩地和林缘游憩地,此现象与游客游览行为密切相关;4)数据显示在大气颗粒物浓度低于Ⅰ级标准时,影响大气颗粒物的环境因子有:最大风速、平均风速、温度、风寒、相对湿度、热力指数、露点温度和湿球温度。

In order to explore the changing features of atmospheric particulate matter concentration during Azalea blooming period in Baili Azalea Forest Park,we collected and analyzed the data of atmospheric particulate matter(APM),such as TSP,PM10,PM2.5,and PM1.0and meteorological factors in 8 monitoring points from 3types of recreation sites(open land,forest recreation site,and forest edge recreation site)in sunny days of late March.Daily variation rules of atmospheric particulate matter concentration in the park and in different kinds of recreation sites,as well as the correlations among the atmospheric particulate matter concentration changes,climatic factors and tourists' visiting behavior were investigated.The observation showed that 1)the daily variation of the concentration of APM with large gain sizes(TSP,PM10)presented U-shape and V-shape patterns:higher in the morning and early evening,lower at noon.APM withsmall grain size(PM2.5,PM1.0)presented a L-shape pattern:higher in the morning and lower at noon and early evening.2)The daily average concentrations of 4kinds of APM detected in 8sites in the park were lower than national standard level I,indicating the air quality was excellent.3)The concentrations of APM in 3types of recreation sites were in the order of open land<forest recreation site<forest edge recreation site,which was closely correlated with the behaviors of the visitors.4)The data showed that when APM concentration was lower than level I,climatic factors that affect APM were maximum and aveage wind speed,temperature,temperature feels like,relative humidity,heating power,dew point temperature and wet bulb temperature.