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通过对土壤的酸碱滴定曲线进行分段直线拟合并求算土壤pH缓冲容量,结果表明在pH4.0~6.0范围内红壤的酸碱滴定曲线可以较好地用直线方程进行拟合,从直线的斜率可以求出土壤在这一pH范围内的pH缓冲容量(pHBC)。对闽、浙、皖3省某些酸性红壤的pH缓冲容量的研究结果表明,不同土壤的pH缓冲容量数值之间有比较大的差异,但大部分红壤的pHBC值在15.0 mmol kg-1左右。土壤有机质和pH对pHBC有重要影响,土壤有机质含量和pH越高,pHBC值越大。
The results showed that the acid-base titration curves of red soil could be fitted well by the linear equation in the range of pH4.0 ~ 6.0, from the straight-line fitting of soil acid-base titration curve and straight line equation The slope of the line determines the pH buffer capacity (pHBC) of the soil in this pH range. The pH buffering capacity of some acidic red soils in Fujian, Zhejiang and Anhui provinces showed that the values of pH buffering capacity of different soils were quite different. However, the pHBC value of most red soils was about 15.0 mmol kg -1 . Soil organic matter and pH have an important impact on pHBC. The higher the soil organic matter content and pH, the greater the pHBC value.