Abstract: With eleven garden plant species in Beijing as test materials,this paper determined the adhesion density of atmospheric particles on leaf surface,observed the micro-configurations of leaf epidermis,and measured the particle size distribution of the particles. The results showed that the particles were mainly adhered on upside leaf surface,and the adsorbed amount was about six times higher than that on underside leaf surface.The particle-retaining capability of the micro-configurations of leaf epidermis was decreased in the order of groove>vein+cell>cell>strip protuberance.The capability of particle-retaining was higher when the micro-configurations were denser and the fall between them was larger.The mean value and the mean percentages of PM_2.5 and PM₁₀ on upside leaf surface were 66.7% and 98.3%,while those on underside leaf surfaces were 43.4% and 92.9%,respectively.

Key words: pyrene, microbe, root exudates, dose