Dissolved organic sulfur in streams draining forested catchments in southern China.
Dissolved organic sulfur (DOS) is an important fraction for sulfur mobilization in ecosystem. In this work stream waters were sampled in 25 forested sites in southern China to study the dissolved sulfur fractions. Dissolved sulfur was fractionated into dissolved organic sulfur (DOS) and inorganic sulfate (SO4(2-)) for 95 stream water samples. The results showed that the concentration of DOS ranged from 0 to 13.1 mg/L (average 1.3 mg/L) in all the streams. High concentrations of DOS in stream waters were found in the sites with high concentrations of sulfate. DOS constituted less than 60.1% of dissolved sulfur (average 17.9%). Statistical analysis showed that DOS concentration was correlated with SO4(2-) in streams waters and total sulfur in surface layer soils. The results also showed that DOS concentration in stream waters had a seasonal variation, but no trends were found with it. The implication was that the long term sulfur deposition had led the increase of the concentration and fraction of DOS in stream waters in acid rain prevailing regions
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. zhanyiwang2006@163.com
Zhanyi
Z
Wang
Xiaoshan
X
Zhang
Zhangwei
Z
Wang
Yi
Y
Zhang
Bingwen
B
Li
Rolf
R
Vogt
D002681:China; D004323:Drainage, Sanitary; D005843:Geography; D016018:Least-Squares Analysis; D016014:Linear Models; D009584:Nitrogen / Q000032:analysis; D009930:Organic Chemicals / Q000032:analysis*; D045483:Rivers / Q000737:chemistry*; D012621:Seasons; D012987:Soil / Q000737:chemistry; D012995:Solubility; D013431:Sulfates / Q000032:analysis; D013455:Sulfur / Q000032:analysis*; D014197:Trees / Q000737:chemistry*; D014881:Water Supply
D009930:Organic Chemicals; D012987:Soil; D013431:Sulfates; D013455:Sulfur; D009584:Nitrogen