s: Two small catchments in Hunan were selected and monitored.Soil acidification was studied by analyzing precipitation and soils from the two catchments.Present soil status and potential future soil acidification in the two small catchments were assessed.Volume-weighed median pH values in precipitation were 4.54 and 4.90.Rough estimates of the corresponding total depositions (dry+wet) are 8.7 g·m-2·a-1 and 7.9 g·m-2·a-1,respectively.It was indicated that the sulfur deposition in Hunan is high.The soil pH values were in the range 3.94~5.19 a...