Mass Concentration of PM2.5 and Heavy Metal Content in Different Plant Communities

In March and April (spring), February and November (winter), collection was made on mass concentration of PM2.5 and heavy metal in different plant communities namely evergreen shrub, evergreen broad leaf stand, mixed forest of conifers and broad leaf, deciduous broad leaf stand and scarce forest and grassland in Zhejiang A&F University. The results revealed that the average total mass concentrations of heavy metals in PM2.5 in five plant communities were higher in winter (897.14±90.39 ng·m-3) than in spring (599.24±59.36 ng·m-3). Average total mass concentrations in the two seasons were ordered by 841.96±77.65 ng·m-3 (scarce forest and grassland) > 799.21±73.97 ng·m-3 (evergreen shrub) > 774.40±76.44 ng·m-3 (deciduous broadleaf stand) > 703.68±69.30 ng·m-3 (mixed coniferous and broadleaf) > 621.70±64.63 ng·m-3 (evergreen broadleaf stand). Mass concentration of Cr, Mn, Cu, As, Sb, Zn and Pb had evident change with season, while that of V, Co, Ni and Cd had no evident change.