植被对冀南地区校园秋冬季PM_(2.5)浓度的影响

Effects of Vegetation on PM_(2.5)Concentration on Campus in Southem Hebei Province in Autumn and Winter

基于冀南地区某校园内PM_(2.5)浓度监测数据,分析了2021年10月22日-31日校园秋冬转换时期大气的PM_(2.5)浓度时空变化特征,研究了PM_(2.5)浓度日变化与不同气象因素之间的相关性。结果表明:校园内PM_(2.5)浓度时空分布存在一定差异。在时间维度上,PM_(2.5)浓度随时间变化趋势与高校所在城市大气PM_(2.5)浓度的日变化趋势具有较好的一致性,同时校园内PM_(2.5)浓度在不同日期之间均具有显著的差异,表明PM_(2.5)浓度具有快速变化的特征;在空间维度上,校园西侧区域和东侧区域PM_(2.5)浓度变化存在一定差异,表明校园植被一定程度上可以有效降低环境中PM_(2.5)的浓度。校园内PM_(2.5)浓度日变化与部分气象因素(温度和相对湿度)之间呈正相关关系,但相关不显著;与风力之间呈显著负相关,表明风力是影响校园内PM_(2.5)浓度的主要因素。

Based on the monitoring data of PM_(2.5)concentration on a campus in southern Hebei Province,the characteristics of temporal and spatial changes of PM_(2.5)concentration in the atmosphere during the autumn-winter transition period from October 22 to 31,2021 were analyzed.The correlation between the each-day variation of PM_(2.5)concentration and different meteorological parameters was studied.The results show that there is certain difference in the temporal and spatial distribution of PM_(2.5)concentration on campus.In the time dimension,the trend of the change of PM_(2.5)concentration over time is in line with the daily variation trend of PM_(2.5)concentration in the city where the university is located.Meanwhile,the PM_(2.5)concentration in the campus has significant differences between different days,indicating that the PM_(2.5)concentration has the characteristics of rapid change.In the spatial dimension,there is certain difference in PM_(2.5)concentration between the west and east regions of the campus,suggesting that campus vegetation can effectively reduce the concentration of PM_(2.5)in the environment to a certain extent.Additionally,there are positive correlations between PM_(2.5)and meteorological parameters,such as temperature and relative humidity,but the correlation is not significant.The significant negative correlation is discovered between PM_(2.5)and wind power,indicating wind power is the main factor affecting PM_(2.5)concentration on campus.