碱性改良剂对富铝化淋溶土酸缓冲性能影响研究

EFFECT OF ALKALINE AMELIORATORS ON ACIDIC BUFFERING ABILITY OF ALUMINUM-RICH ALFISOLS

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ＣａＣＯ＿３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ＣａＣＯ＿３处理者尤为显著，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承纳性能和植物营养观点看，有一定负效应。

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.