SULFUR DISTRIBUTION AND FRACTIONATION IN YELLOW SOILS FROM CHONGQING AREA
重庆地区黄壤中硫形态的分组和硫酸盐的吸附特性

The distribution and the fractionation of sulfur in yellow soils under forests in Chongqing area were studied. The total contents of sulfur were found in a range of 36.00 to 259.25 mg/kg with a mean value of 155.10 mg/kg. There is more sulfur in subsoil than that in surface soil. The average contents of carbon-bound sulfur and ester sulfate sulfur are 43.00 (21.50-82.50) mg/kg and 49.67(12.08-115.38) mg/kg respectively and their contents in surface soils are higher than that in subsoils. The contents of NaH2PO4-S and OAc-S increase as the depth increases and fall into ranges of 27.95 to 105.17 and 23.79 to 86.64 mg/kg respectively. The high concentration of NaH2PO4-S may be caused by acid precipitation. The sulfur content in soils from diffrent regions of the area rank as follows; Jinyun mountain > Shandine > Nanshan.