Pedosphere 10(1): 69--76, 2000
ISSN 1002-0160/CN 32-1315/P
©2000 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Oxidation of elemental sulfur in selected soils of China
LI Shu-Tian, LIN Bao, ZHOU Wei, LIU Qing-Cheng and XU Yu-Lan
Soil and Fertilizer Institute, Chinese Academy of Agricultural Sciences, 30 Baishiqiao Road, Beijing 1O0081 (China)
ABSTRACT
      An incubation experiment was carried out in the laboratory to study the effect of temperature, moisture, phosphorus, organic matter, cropping and previous elemental sulfur application on elemental sulfur oxidation in a fluvo-aquic soil, a black soil, a yellow-brown soil and a red soil. In all the soils tested, sulfur oxidation rate was influenced by temperature and the temperature coefficient (Q10) values at the range from 10 to 30 ℃ were 4.41, 4.05, 6.19 and 3.71 for the four soils, respectively. The rate of sulfur oxidation was parabolically related to soil water content. The optimum moisture content for the maximum oxidation rate was different among soils. Phosphorus increased the oxidation rate of elemental sulfur by 57.7, 33.1, 21.7 and 26.4% for the above four soils, respectively, compared with the control (no phosphorus applied). Organic material of maize straw which was ground and passed through a 0.5-mm sieve increased the oxidation rate of elemental sulfur in the four soils by 59.8, 7.8, 39.2 and 540.4%, respectively. Elemental sulfur which was applied previously to soils significantly enhanced the oxidation of elemental sulfur subsequently added and increased sulfur-oxidizing populations such as autotrophic elemental sulfur oxidizers with pH optimum 6.8, autotrophic thiosulfate oxidizers with pH optimum 6.8, heterotrophic thiosulfate oxidizers and heterotrophic sulfate producers. Cropping had little effect on elemental sulfur-oxidizing potentiality of soils.
Key Words:  elemental sulfur, oxidation, soil
Citation: Li, S. T., Lin, B., Zhou, W., Liu, Q. C. and Xu, Y. L. 2000. Oxidation of elemental sulfur in selected soils of China. Pedosphere. 10(1): 69-76.
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