Pedosphere 9(2): 123--130, 1999
ISSN 1002-0160/CN 32-1315/P
©1999 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Composition of sulphur pool in selected upland soils in North China |
| ZHOU Wei, LIN Bao, WANG Hong, LI Shu-Tian and HE Ping |
| Institute of Soil and Fertilizer, Chinese Academy of Agriculturol Sciences, Beijing 100081 (China) |
| ABSTRACT |
| Soil sulfur fractions, including monocalcium phosphate-extractable S, slowly soluble inorganic S, ester sulphate S (C-O-S), C-bonded S and unidentified organic S, were analysed for 48 soils, as representatives of Fluvisol, cinnamon soil, loessial soil, chestnut soil, black soil and brown soil in North China. The contents of total S and monocalcium phosphate-extractable S in these soils ranged from 234 to 860 and 5.1 to 220.3 mg/kg-1, respectively, and each of 6 soil groups contained samples with a low level of phosphate-extractable S. Great differences in the average contents of each fraction of S were observed among the above 6 soil groups. Expressed as average percentage of the total S in soils, fluvisols, cinnamon soils, loessial soils, chestnut soils, black soils and brown soils contained 6.1%, 9.5%, 5.7%, 13.2%, 3.5% and 6.8% monocalcium phosphate-extractable S; 5.7%, 3.0%, 9.3%, 10.4%, 3.2% and 3.1% slowly soluble inorganic S; 51.6%, 26.7%, 17.4%, 31.2%, 28.9% and 22.7% C-O-S; 11.0%, 9.1%, 6.6%, 6.8%, 9.7% and 9.4% in C-bonded S; and 25.6%, 51.7%, 60.8%, 38.4%, 54.7% and 53.0% unidentified organic S, respectively. For the above 6 groups of soils, the mean C:N ratios were similar, ranging from 9.7 to 10.7, while the mean N:S ratios ranged from 1.16 to 3.12. The highest ratios of C:N, C:C-O-S and C:C-bonded S were found in black soils, averaging 30.4, 104.9 and 314.7, respectively, while the lowest ratios arose in chestnut soil, averaging 12.4, 39.7 and 183.3, respectively. |
| Key Words: C-bonded S, C-O-S, sulphate, upland soil |
| Citation: Zhou, W., Lin, B., Wang, H., Li, S. T. and He, P. 1999. Composition of sulphur pool in selected upland soils in North China. Pedosphere. 9(2): 123-130. |
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