Greening Tree Species For Particulate Matter Capturing Ability In Beijing Park And Its Application Mode

The Park is available to the public for sightseeing, enjoying, resting, carrying out the scientific culture, exercising and other activities, and it has a perfect facilities and good greening environment of public green space, thus reducing the dust detention to the plant requirements has more stringent. Based on this reason this paper chooses common green plants in Beijing as the research object, analyzes difference of plant dust detentions in the two different pollution levels’ sites, and consider the plant leaves response to the environment, more in-depth research mechanism of dust retention. Finally, we will choose the Olympic forest park as the main sampling. The main result of this study are as follows:(1) The capability of capturing PM unit leaf area of tree species cannot decide that of other size fractions.(2) Atmospheric pollution can alter the leaf surface structure and properties of the tested plant species which led to the variation in PM accumulation.(3) Leaves with deep grooves, high wettability, and high stomatal density(>189 N/mm2) had a higher PM capturing amount. Meanwhile, stomatal density larger than 217 N/mm2 increased the PM2.5-10 capturing ability of leaves. While, trichomes increased PM2.5 capturing ability.(4) E. japonicas should be planted in traffic and industrial areas, while S. japonica, G. biloba, F. chinensis should be chosen as complementary in clean areas. S. japonica, G. biloba were adapted well to polluted environment, but, F. chinensis was not.(5) Evergreen tree–tree plants had stronger ability to strand PM>2.5 and PM, as the same as evergreen pure tree plants to strand PM2.5.(6) Canopy density was greater, stranding PM and PM>2.5 of the total and unit green area was better in the sample area, the ability to strand PM was stronger. Whencanopy density was between 0.6 and 0.7, the ability to plant stranded PM2.5 was stronger unit green area. Overall, when the porosity density was between 0.2 and 0.3, stranding PM and PM>2.5 of the total and unit green area were the biggest.Under the above research results, this paper combined the choice of plant species and community structure, and designed application mode of the park greening plant stranded PM.