Pedosphere 4(4): 331--338, 1994
ISSN 1002-0160/CN 32-1315/P
©1994 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Sulphur status in some surface horizons and typical profiles of soils derived from Xiashu loess in China |
LIANG Yong-Chao, MA Tong-Sheng, CHEN Xing-Hua, LIAN Chun-Lan and WEI Le-Fei |
Depertment of Soil Science and Agrochemistry, Nanjing Agricultural University, Nanjing 210095 (China) |
ABSTRACT |
Studies were conducted to examine factors which might influence the status and distribution of S in some surface horizons and typical profiles of soils derived from Xiashu loess on the upper slope (US), middle slope (MS) and lower slope (LS) of Nanjing-Zhenjiang-Yangzhou hilly zone. The total S contents varied from 70.30 to 350.21 mg/kg, and the average for all surface soils was 218.3 mg/kg. The average S contents in the profiles followed the sequence: USo) and the ratio of amorphous iron oxide to free iron oxide (Feo/Fea), but no significant relationship was found between total S and the ratio of free iron oxide to total iron (Fed/Fet). Inorganic sulphate in paddy soils (MS and LS) was nearly higher in surface soil than in subsurface soil and subsoil, it, however, remained relatively unchanged with increasing depth for the original soil profile (US). The average organic S accounted for 94% of the total S in the surface soils, but the percentage decreased with depth in the profiles. Like the total S, the organic and inorganic S contents were highly significantly correlated with organic matter, total N, Feo and Feo/Fed ratio, but they were insignificantly related to Fed/Fet ratio. The C/S and N/S ratios in this study were somewhat lower than the results reported by others. The C/N/S ratios varied considerably within the same profile and among different soils but they fell within the range of values reported worldwide. |
Key Words: paddy soil, sulphur distribution, sulphur status |
Citation: Liang, Y. C., Ma, T. S., Chen, X. H., Lian, C. L. and Wei, L. F. 1994. Sulphur status in some surface horizons and typical profiles of soils derived from Xiashu loess in China. Pedosphere. 4(4): 331-338. |
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