A Study on Leaf Dust Retention and Absorption of Fluorine and Sulfur Pollutants in Yinchuan City
Urban dust and industrial emission of fluorine sulfur compounds are important sources of air pollution in arid areas.Garden plants can block dust and absorb some air pollutants.In order to investigate the influence of green plants on dust and the absorption capacity of fluorine sulfur compounds in leaves in Yinchuan City,the leaves of major green tree species were sampled in Yinchuan City and Ningdong Industrial Park,and the distribution of dust retention and fluorine sulfur content of different tree species were analyzed.The results showed as follows:①The leaf dust retention of 15 kinds of trees in Yinchuan Forest Park ranged from 3.91 to 29 046.85 mg·dm-2.The leaf dust retention of evergreen tree was significantly higher than that of deciduous trees,and the leaf dust retention of Platycladus orientaliss in evergreen trees was the highest.②The average content of fluorine and sulfur in the leaves of 15 plants in forest park was 13.75 mg·kg-1 and 2 393.27 mg·kg-1 respectively.The average content of fluorine and sulfur in the leaves of 21 plants in Ningdong Industrial Zone was 22.04 mg·kg-1 and 1 361.52 mg·kg-1.The leaves of Pinus tabulaeforms Carr.had the strongest absorption capacity of fluorine,followed by Euonymus,Lolium perenne,Amygdalus persica'Duplex',Prunus cerasifera'Atropurpurea',Ailanthus altissima(Mill.)Swingle and Juniperus chinensis L.The sulfur absorption capacity of the leaves of Salix matsudana was the strongest,followed by Lonicera maackii(Rupr.)Maxim.,Prunus triloba Lindl.,Salix babylonica L.and Euonymus maackii Rupr..③The comparison of soil fluorine sulfur content between forest park and Ningdong Industrial Park showed that the soil fluorine content in forest park was significantly higher than that in Ningdong Industrial Park,the content of soil sulfur in Ningdong industrial zone was significantly higher than that in forest park and the soil fluorine sulfur content in leaves was not consistent with that in soil.According to the results of this study,coniferous tree species have strong adsorption capacity for dust,and can be preferred as the tree species to control dust pollution in urban forestry construction.The tree species with strong atmospheric sulfur absorption ability,such as Salix babylonica L.,Euonymus maackii Rupr.and Elaegnus angustifolia L.,can be deployed in the area with heavy atmospheric sulfur pollution to reduce sulfur pollution,and these tree species also have strong absorption and purification ability of fluoride in the atmosphere,so they are very potential green plants in industrial areas.
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