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Effect of purifying SO 2 in atmosphere by greening tree species.

Luo Hongyan;Li Jiyue;Liu Zeng. Journal of Beijing Forestry University (2000) 22 (1) 45~50[Ch, 22 ref.] College of Recourses and Environment, Beijing For. Univ., 100083, P. R. China.  
The characteristics of absorbing and accumulating SO2 in atmosphere,the role as indicators and the effect of purifying SO 2 pollution by 32 greening tree species were studied in the Fangshan District,Beijing. The results show that greening trees are of ability of absorbing and accumulating SO 2 in atmosphere, but there are great differences among varied species, in which Salix matsudana Koidz.f. pendula Schneid. has the greatest ability of purifying SO 2 in atmosphere. Other species, such as Robinia pseudoacacia, Sophora japonica,Broussonetia papyrifera, Forsythia suspensa Vahl., Diospyros kaki, Koelreuteria paniculata and Amorpha fruticosa also have this kind of effect. Generally speaking, flowers and brushes have greater ability of absorbing and accumulating SO 2 than evergreen trees but smaller than deciduous trees.
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