| With the rapid development of global industrialization,the problem of air pollution is becoming more and more serious.Atmospheric particulate pollution is a serious threat to human health and safety.To this end,the governments of all countries have introduced corresponding governance policies,laws and measures to reduce atmospheric particulate matter,among which the use of vegetation to reduce particulate matter concentration is more green and effective.Using aerosol generator again scanner,scanning electron microscopy(sem),leaf area,studied the Hohhot eight kinds of common greening tree species unit leaf area and plant species of TSP,PM10,PM2.5 and PM1.0 adsorption quantity difference,at the same time,analyses the eight kinds of greening tree species unit leaf area of TSP,PM 10,PM2.5 and PM 1.0 adsorption amount of time and space differences and microscopic observation on the leaf of greening tree species.The main conclusions are as follows:(1)In terms of TSP,PM10,PM2.5 and pm1.0,the particle adsorption capacity ofconiferous trees is higher than that of broad-leaved trees.Among the coniferous trees,Picea wilsonii Mast has the highest particle adsorption capacity and Sabina chinensis(Linn.)Ant has the lowest particle adsorption capacity.Among the broad-leaved species,for DP≥10μg particles,Salix matsudana Koidz has the highest adsorption capacity,DP≤10 μg particles,and Sophora japonica Linn has the highest adsorption capacity.The particle adsorption capacity of a single tree species is still coniferous tree species>broad-leaved tree species,and the highest adsorption capacity is Pinus tabulaeformis Carr with the largest total leaf area.(2)After studying the temporal and spatial differences of particulate matter adsorption capacity per unit leaf area of each tree species,it was found that the adsorption capacity of particulate matter in winter and spring was higher than that in summer and autumn,and the adsorption capacity of particulate matter in the tree species near the higher air pollution level was higher.The adsorption capacity of particles in the East,South,West and north direction of the same tree is determined by the wind direction and the canopy structure.The adsorption capacity of particles in the upper part of the canopy is less than that in the lower part,and the adsorption capacity of particles in the inner part of the canopy is higher than that outside the canopy.(3)Through scanning electron microscopy,it was found that the leaves with high adsorption of particulate matter had relatively high stomatal density,stomatal depression and stomatal opening. |
