摘要
研究了砖红壤、赤红壤、红壤、黄壤等土壤的Ｂ层对ＳＯ的吸附特点，并分析其与有关土壤性质的关系。这些土壤的可浸提态ＳＯ含量在０．１ｇ／ｋｇ至０．５ｇ／ｋｇ间，对外加ＳＯ的吸附潜力仅为０．０５ｇ／ｋｇ至０．１ｇ／ｋｇ．用含２５ｍｇ／Ｌ的ＳＯ的溶液持续通过土壤时，它们对ＳＯ的吸附表现为对数曲线方程。降低处理液的ｐＨ值可大大减少土壤对ＳＯ的吸附量。土壤经草酸铵处理后，几乎丧失ＳＯ吸附能力．统计表明，土壤中可浸提态ＳＯ含量及ＳＯ吸附容量与土壤的＜２μｍ粘粘含量、Ｆｅｄ含量、速效磷含量等有显著的相关关系。
The properties of SO adsorption by B horizons of latosol, latored soil,red soil and yellow soil and its relationship with other soil parameters were studied in this paper. The amount of Ca (H2 PO4)2 - extractable SO of these soils ranged from 0. 1g/kg to 0. 5g/kg. They showed a small potential adsorption capacity for inputed SO, being 0. 05g/kg-0. 1g/kg. Under the leaching of the solution containing 25mg/L, the adsorption arrived in a steady state following a short, rapid adsorption stage.The capacity for retaining the solution SO was significantly reduced by lowering the pH value of the leaching solution. The soils nearly lost the SO adsorption ability after being treated with ammonium oxalate. The statistics showed that the SO adsorption capacity and the amount of SO retained were in the close correlation with the content of <2μm clay, of Fed and of availabe phosphorus.
基金
国家自然科学基金
