Abstract: Evergreen species of Chinese pine (Pinus tabuliformis) and oriental arborvitae (Platycladus orientalis) in the urban forest ecosystem were selected in order to determine the absorption and concentration effects of leaves to atmospheric pollutants (SO₂, Cl₂) and heavy metal pollutants (Cu, Zn, As, Hg, Pb, Cd and Cr) in soil. The results indicate that two evergreen species are of stronger absorption ability to pollutants. The absorption ability is influenced by the environmental pollution extent and types of pollutants in the different seasons. Chinese pine (Pinus tabuliformis) and oriental arborvitae (Platycladus orientalis) have a higher absorption ability to S, Cu, Zn, Pb, Hg and to Cu, Zn, Hg, Cd in autumn, and their mean concentrations of leaves are 2158.75, 6.31, 31.46, 4.05, 0.08 mg·kg-1 and 4.47, 22.47, 0.09 mg·kg-1,0.20 mg·kg-1, respectively. The absorption and concentration abilities of the two evergreen species to pollutants are different under the different habitat conditions. In pine forest sample site of Shijingshan with serious soil pollution, Chinese pine (Pinus tabuliformis) and oriental arborvitae (Platycladus orientalis) can absorb largely SO₂ and Cl₂, respectively. For the heavy metal pollution, the concentration effects of two evergreen species to Cu, Pb, Cr and As are high.

Key words: Chinese pine (Pinus tabuliformis), Oriental arborvitae (Platycladus orientalis), Urban forest, Heavy metal, Air pollutants, Absorption ability