• 关键词：酸性淋溶土  碱性改良剂  土壤表面电荷  SO吸附－解吸性能  酸化缓冲容量

• 基金项目：国家自然科学基金

• 吴杰民
• 浙江农业大学环保系, 杭州 310029

• 邵峰
• 浙江农业大学环保系, 杭州 310029

• 摘要：研究区2种酸缓冲能力较弱的富铝化酸性淋溶土施用不同剂量CaCO₃和电厂粉煤灰后, 土壤pH值和酸化缓冲容量（Q_pH）均有不同程度增高, 施CaCO₃处理者尤为显着, 表明土壤抗酸化性能有明显改善。实验结果同时表明, 施用改良剂后, 土壤胶体表面正电荷量减少, 负电荷量增加, 后者对介质中阴离子的斥力增大, 故对酸雨中主成份离子--的吸附量降低, 虽然对其固定能力未明显减弱, 但也说明将有较多的在土体中移动和淋失, 从土壤对硫酸型酸雨主成份的

• Abstract：Lime and coal flying ashes were used in this study to reduce acid depo-sition and to improve the buffering ability of two acidic soils sampled fromZhejiang province.The results showed that the values of both pH and acidicbuffering capacity (Q_pH)increased significantly, especially in liming treat- ment, indicating that the resistance of treated soil samples to acid deposi-tion was increased. Meanwhile, the absorption amounts of by all trea-ted soils were decreased to some degree due to the increase of net negative charge of soil colloidal surfaces with decrease of soil acidity.Although the fixation of absorbed was not reduced,the adverse effect existed in all treatment.

• Key words：acidic alfisol  alkaline amendment  charge of soil surface  absorption-desorption of  acidic buffering capacity.

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