Abstract:
To investigate the deposition fluxes of atmospheric metals and their differences among various southeast tobacco-planting regions, natural precipitation method was adopted to collect atmospheric deposition samples. The deposition fluxes of nine metals(Al, Cr, Mn, Fe, Ni, As, Se, Cd and Pb) and the differences of nine metals among four types of farming areas(general agricultural area, area around town, area close to roadside and area around factories) were analyzed. The results showed that:1)The deposition fluxes of nine metals were significantly different, and those of Al and Se were 83.91-15 132.88 and 0.05-2.68 μg·m
-2·d
-1, respectively. The variation coefficients of deposition fluxes of different metals also varied greatly, those of Mn, Fe and Al were higher, and those of As and Pb were lower. 2)The deposition fluxes of the nine metals from the four farming areas were in the order of Al ≫ Fe ≫ Mn ≫ Pb > the other five metals(Cr, Ni, As, Se and Cd), and the deposition fluxes of Cr, Ni, As, Se and Cd differed among the four types of farming areas. The deposition flux of Pb was higher than those of Cr, Ni, As, Se and Cd, hence atmospheric Pb deposition might be an important source of Pb in tobacco leaves in addition to soil and fertilizer. 3)The deposition fluxes of the nine metals in areas around factories were the highest and significantly differed from those in general agricultural area, areas around town and areas close to roadside, while the differences among the last three farming areas were not obvious.