ABSTRACT

Sulfur (S) fractions, distributions and sorption characteristics of some soils in Ogunstate, Southwestern Nigeria, were evaluated in ten different locations, the area lies with in the Derived Savannah and forest agro-ecological zone. Result showed available, adsorbed, organic and total S ranged from 3.9 to 19.8, 16.3 to 36.6, 214.9 to 412.9 and 248.8 to 446.6 mg kg⁻¹ respectively. Organic S constituted 86.4 to 93.4% of total S. The mean status of available S was slightly above the critical limit of 10 mg kg⁻¹. All fractions of S maintained significant positive correlation (p ≤ .05) with each other and total organic carbon, while available and adsorbed S had significant and negative correlation with soil pH, total nitrogen, available phosphorus and calcium. The S sorption behavior of the soils varied and increased with increase in S concentrations of equilibrium solution. The isotherm model for the ten locations was S-curved type. Sorption data were fitted to Langmuir and Freundlich sorption isotherms. Langmuir equation was best fitted to the S adsorption data in the ten locations except soils from Owode, Odeda and Ikenne. Langmuir and Freundlich parameters (sorption maxima, binding energy and maximum buffering capacity affinity constant and slope) were significantly correlated with some soil properties.

摘要

对尼日利亚西南部奥贡州的一些土壤的硫 (S) 分数、分布和吸附特性进行了评估，该地区位于衍生萨凡纳和森林农业生态区的十个不同地点。结果显示，有效硫、吸附硫、有机硫和总硫分别为 3.9 至 19.8、16.3 至 36.6、214.9 至 412.9 和 248.8 至 446.6 mg kg ^-1。有机硫占总硫的 86.4% 至 93.4%。有效硫的平均状态略高于 10 mg kg ^{-1的临界限值}. S的所有组分与彼此和总有机碳保持显着的正相关（p≤0.05），而有效和吸附的S与土壤pH、总氮、有效磷和钙呈显着和负相关。土壤对硫的吸附行为随着平衡溶液中硫浓度的增加而变化和增加。十个位置的等温线模型为 S 曲线型。将吸附数据拟合到 Langmuir 和 Freundlich 吸附等温线。Langmuir 方程最适合于除了来自 Owode、Odeda 和 Ikenne 的土壤之外的 10 个位置的 S 吸附数据。Langmuir 和 Freundlich 参数（吸附最大值、结合能和最大缓冲能力亲和常数和斜率）与一些土壤特性显着相关。