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当前位置: 首页 > 文章 > Sulphur Status in Some Surface Horizons and Typical Profiles of Soils Derived from Xiashu Loess in China 土壤圈(英文版) 1994,4 (4)
Position: Home > Articles > Sulphur Status in Some Surface Horizons and Typical Profiles of Soils Derived from Xiashu Loess in China Pedosphere 1994,4 (4)

Sulphur Status in Some Surface Horizons and Typical Profiles of Soils Derived from Xiashu Loess in China

作  者：
Liang Ya
单  位：
ONG-CHAO, MA TONG-SHENG, CHEN XING-HUA, LIAN CHUN-LAN #R##N##R##N##R##N#andWEI LE-FE
关键词：
fe;total;soils;ratio;surface;averag
摘  要：
Studies were conducted to examine factors which might influence the status and distribution of S insome surface horizons and typical profiles of soils derived from Xiashu loess on the upper.slope (US), middleslope (MS) and lower slope (LS) of Nanjing-Zhenjiang-Yangzhou hilly zone. The total S contents varied from70.30 to 350.21 mg/kg, and the average for all surface soils was 218.3 mg/kg. The average S contents inthe profiles followed the sequence: USMSLS. The total S was closely correlated with organic S, inorganicS, organic matter, total N, amorphous iron oxide (Fe_o) and the ratio of amorphous iron oxide to free ironoxide (Fe_o/Fe_a), but no significant relationship was found between total S and the ratio of free iron oxideto total iron (Fe_d/Fe_t). Inorganic sulphate in paddy soils (MS and LS) was nearly higher in surface soilthan in subsurface soil and subsoil, it, however, remained relatively unchanged with increasing depth for theoriginal soil profile (US). The average organic S accounted for 94% of the total S in the surface soils, butthe percentage decreased with depth in the profiles. Like the total S, the organic and inorganic S contentswere highly significantly correlated with organic matter, total N, Fe. and Fe_o/Fe_d ratio, but they wereinsignificantly related to Fe_d/Fe_t ratio. The C/S and N/S ratios in this study were somewhat lower thanthe results reported by others. The C/N/S ratios varied considerably within the same profile and amongdifferent soils but they fell within the range of values reported worldwide.

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