Culfur content of the leaves and chlorophyll fluorescence of 9 garden plant species from Shenzhen were measured in November 2005 to evaluate effect of atmospheric SO2 and to select bio-indicators for atmospheric SO2 monitoring.These plant species include Excoccaria cochinchinensis,Sanchezia nobilis,Codiaeum variegatum,Saruma henryi,aryota mitis,Ficus microcarpa var.pusillifolia,Ficus altissima,Pittosporum tobir aand Duranta repens cv.\'Dwarf Yellow\'.Under natural condition,the sulfur content in leaves of Sanchezia nobilis was the highest,and that for Codiaeum variegatum was the lowest.Sulfur contents of leaves treated with distilled water from the 9 species showed very slight change.When treated with NaHSO3,the sulfur contents in seven of the 9species increased,especially in the leaves of C.variegatum.The same 9 species were collected from two gardens where the atmospheric SO2 concentration is different:Small Nan Hills with high air SO2 and World Exhibition Park with low air SO2.Except for P.tobira,the other 8 species had higher sulfur contents and lower Fv/Fm in Small Nan Hills than in the World exhibition Park.This result demonstrates that Fv/Fm of the 9 plant species is a suitable parameter to indicate pollution from atmospheric SO2.
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