Study on the Effect of Absorption and Purification Air Pollution of 10 Common Greening Species at Different Polluted Area in Kunming

The dust retention and SO2 and NOx absorption and purification of 10 species of trees with high frequency use and similar in treeage were studied at different polluted area in Kunming. The results showed that catching quantity of per unit leaf area dust at the same high degree and average per unit area dust for broadleaf trees and conifers are as follows: industrial area > main city area > clean check plot; dustretention ability of broadleaf trees is as the follows: Cinnamomum japonicum > Osmanthus fragrans > Ligustrun lucidum > Platanus acerifolia > Magnolia Grandiflora > Celtis kunmingensis, catching quantity of conifers from large to small is as follows: Sabina chinensis cv. kaizuca > Sabina chinensis cv. pyramidalis > Cryptomeria japonica > Cedrus deodara; The species of best dust removal effect is Cinnamomum japonicum, its dust catching quantity in industrial area and the main urban area are 15203g/m2 and 8504g/m2, they are 102 times and 57 times of clean area, respectively; The difference of dust amount for four conifer species is 106-143 times, the difference was smaller than it is in the broad leaved tree. The dust amount in low position was significantly higher than that of the high position whether conifer or broadleaf trees; The contents of N and S in the leaves of the plant have a weak correlation with that of the soil, the concentration and absorption of N and S in the leaves of the plant were mainly derived from the atmosphere; The SO2 absorption ability of Platanus acerifolia, Ligustrun lucidum, Osmanthus fragrans and Ligustrun lucidum and Platanus acerifolia for NOx absorption ability are stronger than others.