碱性改良剂对富铝化淋溶土酸缓冲性能影响研究

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值和酸化缓冲容量均有不同程度增高，施ＣａＣＯ３处理尤为显，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，后对介中阴离子的斥力增大，故对酸雨中主成份离子－ＳＯ４＾２－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ＳＯ４＾２－在土体中移动和

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

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.