In order to research retention capacity of airborne particulate matters (PM) by common plants, 29 species of representative plants in Beijing were chosen to systematically analyze the characteristics of deposition of PM with different size on them by using direct sampling, electron microscope analysis, image processing and statistical analysis methods. The results showed that: (1) Over 94% of PM deposition on plants’ leaf surface were PM10(DP≤10μm), PM2.5(DP≤2.5μm) accounted for over 85%, whereas, coarse particles accounted for less than 6%; The average volume percentage of PM10 was 71.3%, that of PM2.5 was 4.22%~26.14%, and the average volume percentage of coarse particulate was over 28.7%. (2) There are great difference in the per unit leaf area particulate adhesion ability among different tree species, The amount of particle-retaining per unit area byCedusdeodara(3.405 g·m-2)is 43 times that ofSalix pendula(0.079 g·m-2). The amount of particle-retaining per unit area byBuxusmicrophylla(6.102 g·m-2)is 28 times higher than that ofCercischinensis(0.213 g·m-2).(3) The capability of PM2.5 detained by 29 kinds of plants in every unit leaf area showed thatBuxusmicrophyllahad better PM retention ability than other shrubs, which could reach 1.168 g·m-2. Within arbor species, Ginkgo biloba had the best PM retention ability, which could reach 0.225g·m-2. (4) The capability of PM2.5 detained by the whole 29 kinds of plants showed thatSophora japonica ,Ginkgo biloba ,Ailanthus altissima, Populustomentosa, Salix matsudana, Sabina chinensisandEucommiaulmoideshad better PM retention ability than other arbor species, Within shrubs and vines species, Amygdalustriloba, Hibiscus syriacus, Malus sparkler, Syringa oblateandBuxusmicrophyllahad better PM retention ability. (5) whether the groove on the plant leaf surface formed by arranged cells or through a variety of strip protuberance, wave protrusions and ridges, as long as the groove is more intense and of greater depth difference, the plant could detain more particulate matters. What’s more, The plants whose leaf surface had waxy, more glandular hairs and cohesive juices could more easily detain particles.
国家科技期刊平台
NSTL
维普
万方数据
