Sulfur Species and Isotopic Compositions in Limestone Soils on Slopes of Karst Regions

• 责任者：Zhang Wei (Key Laboratory for Water Environment and Resources ; Tianjin Normal University ; Tianjin 300387 ; China) ; Liu Congqiang
• 刊名：Geochimica
• 出版年：2010
• 卷期：39(3)
• 关键词：土壤 ; soils ; 硫 ; sulfur
• 页码：p.251-257
• 图表：4 illus., 3 tables, 30 refs.
• 分类号：1400
• issnNo：ISSN0379-1726
• isbnNo：CN44-1398/P

Sequential extraction methods for sulfur species were used to determine sulfur contents and δ³⁴S values of total sulfur, SO₄^{2 -}-S, S⁰-S, FeS-S, FeS₂-S and organic sulfur in soils on slopes of karst regions. Organic sulfur was the dominant sulfur species in limestone soils. The decreases of total sulfur and organic sulfur contents with increasing depths are related to organic sulfur mineralization. FeS₂ is generally the dominant inorganic sulfur forms in limestone soils, followed by SO₄^{2 -}, FeS and S⁰. The increases of FeS₂-S contents with depths below the surface soils are related to increasing rate of dissimilatory sulfate reduction. Correspondingly, the δ³⁴S values of SO₄^{2 -} and FeS₂ increase in parallel.