Abstract
During the period From November 1998 to October 1999, the air sulfur dioxide (SO 2 ) and sulfate (SO 2− 4 ) concentrations were measured and rain water was collected on farmland at Yingtan, a typical red soil area in the Jiangxi province of China. Based on hourly meteorological data and surface resistance data from the literature, the dry deposition velocities of SO 2 and SO 2− 4 were computed using a three-layer resistance analogy model, and sulfur dry deposition was calculated. The wet deposition was obtained from precipitation amount and sulfur concentrations in rainwater. The average dry deposition velocities of SO 2 and SO 2− 4 on farmland were found to be 0.38 ± 0.16 cm s −1 (monthly average 0.16–0.55 cm s −1 ) and 0.20 ± 0.12 cm s −1 (monthly average 0.15–0.27 cm s −1 ), respectively. The annual total sulfur deposition for the study region is about 103 kg S ha −1 , of which 83% is dry deposition. The uncertainties due to measurement and the dry deposition model are less than 30%. It is also found that atmospheric deposition plays a key role in sulfur circulation within the agrecosystem, accounting for more than 90% of the total sulfur input to farmland DOI: 10.1046/j.1435-6935.2003.00076.x
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