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| Responses of three acacia species seedlings exposed to short-term air pollution |
| Wen Dazhi1, Zhu Jianyun2, Cao Honglin1, Zhang Deqiang1, Ye Yongchang2, Liu Songsong2, Li Guohui2 |
| 1. South China Institute of Botany, Chinese Academy of Sciences, Guangzhou 510650; 2. Forestry Institute of Dongguan, Guangdong Province, Dongguan 523106 |
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Abstract Measurements on gas exchange parameters have been made in leaves of three 2 to-3 year-old Acacia species seedlings transplanted and grown under different polluted sites for 4 months by using LCA-4 photosynthesis system. Possible effects of air pollution imposed on plants and their tolerance were evaluated. The net photosynthetic rate(Pn), stomatal conductance(gs) and the photochemical efficiency of the PSII(Fv/Fm) differed among species and generally decreased under polluted area. The transpiration rate(E) and water use efficiency (WUE) in leaves of Acacia macradenia maintained relatively stable among all the three experimental sites, but Pn/E of Acacia floribunda and Acacia fimbriata decreased under polluted sites, when compared with those under the relatively clean area. Based on the changes in Pn, gs, and Fv/Fm, and compared these Fv/Fm values with other plants, it can be concluded that the three Acacia species exhibited moderate tolerance, and Acacia floribunda and Acacia fimbriata showed slightly higher tolerance than Acacia macradenia.
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Received: 25 August 2002
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