校园绿地不同植物群落大气PM2.5浓度变化及其微观形貌分析

o investigate the characteristics of PM2.5 concentrations in Nanjing Forestry University , PM2.5 concentrations were measured to discuss the character of the PM2.5 concentration annual change in different plant communities. While, micro-morphology of particles was analyzed to speculate about PM2.5 source with high resolution. Scanning Electron Microscopy, image analysis technique and Energy Dispersive X-ray Spectrometry. The results showed that the concentration of PM2.5 in green space was lower than that in bare land of campus, and PM2.5 concentration in arbor-shrub-herb was lower than that in the other type of plant community. PM2.5 concentration was highest in winter, followed by that in summer. Soot aggregates, coal fly ash and mineral particles were found in PM2.5 samples. The mineral particles were the main component of particles in the campus, accounted for 45% by number. The high proportion of mineral particles implied that the air of the campus was influenced by blown dust deeply in autumn and winter.