title: [Regulation of four typical scenic recreational plantations to stand PM2.5 concentration in Beijing, China].
abstract: To study the variation of PM2.5 concentration in scenic recreational plantations and its response to meteorological factors, and to analyze the regulation effect of different stands on PM2.5 concentration, in the summer, autumn and winter of 2013, PM2.5 concentration and relevant meteorological factors in four typical scenic recreational plantations (Pinus armandii--Ginkgo biloba mixed plantation, Populus tomentosa--Fraxinus chinensi mixed plantation, Populus tomentosa pure plantation, multiple-species-layered mixed plantation) were simultaneously monitored, in Beijing Olympic Forest Park (the observation was conducted continuously for 28 days). The results showed that the daily variation of PM2.5 concentration in the four stands didn' t represent a unified pattern at different air pollution levels, but were basically consistent at the same pollution level. When the wind force was 0-2 grade, there was no significant difference among daily average PM2.5 concentrations [the average PM2.5 concentration during the observation period (9:00-15:00) ] in the four stands at each pollution level. Stand PM2.5 concentration was positively correlated to air relative humidity (P < 0.01), negatively correlated with air temperature (P < 0.05), but uncorrelated with wind speed. Changed percentage of stand PM2.5 concentration compared to the space varied between -21.4% and 33.2%, and it was negatively correlated with air relative humidity (P < 0.05), but not correlated with the wind speed and air temperature. The regulation effects of the four stands on PM2.5 concentration included both increasing and decreasing effects, and in this study, the critical value of air relative humidity was 67% when this regulation shifted.
authors.forename: Zhi-dan
authors.initials: ZD
authors.lastname: Zhang
authors.forename: Zhi-guo
authors.initials: ZG
authors.lastname: Cao
authors.forename: Li-ming
authors.initials: LM
authors.lastname: Jia
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000068476:Beijing; D002681:China; D004784:Environmental Monitoring; D065928:Forests; D006813:Humidity; D008685:Meteorological Concepts; D052638:Particulate Matter / Q000032:analysis*; D011998:Recreation; D012621:Seasons; D013696:Temperature; D014919:Wind
chemical_list: D000393:Air Pollutants; D052638:Particulate Matter