南方土壤酸沉降敏感性研究 Ⅵ.固相组成与酸缓冲性能

通过连续提取方法研究了土壤固相组成对酸沉降敏感性的影响。结果表明，不同土壤质子缓冲反应的类型不同，因此，缓冲容量及缓冲强度等指标也有较大差异。有机质对酸缓冲反应存在双重影响。取决于土壤原始ＰＨ值及盐基组成状态。

SENSITIVITY OF SOIL TO ACID DEPOSITION IN SOUTH CHINAⅥ. SOIL SOLID COMPONENTS AND ACID BUFFERING CAPACITY

The effects of soil solid components on soil sensitive to acid deposition were studied by sequential extraction method.The soils were collected from the main acid deposition region in south China including red soils, latored soils, latosoils, yellow soils (ferrallisols), rendzinas, red limestone soils, coastal solonchak and vertisols.The results indicate that the acid buffering capacity and acid buffering intensity differ greatly among soils studied due to the difference in types of proton buffering reactions.Two kinds of effects of organic matter revealed depend on soil original pH and exchangeable cation composition.The hydrolysis of the activated oxides was a very important proton buffering reaction at low pH.The crystalline oxides also took part in the buffering reactions, but restricted by the rate of activation reactions of oxides.Meanwhile, the interaction and combination of soil solid components also played a significant role on soil acid buffering capacity.