Section 4 Soil buffering 一、 Concept of soil buffering Soil buffering is the ability of soil to resist change in ph 三、 Acid or alkali buffering of soil ( The principle of acid or alkali buffering of soil HAc -Ht+Ac NaAc +hcl - hac +Nacl Colloid-M+HCl Colloid-H+MCl p=pk。+log盐 [酸]Section 4 Soil buffering 一、Concept of soil buffering Soil buffering is the ability of soil to resist change in pH. 二、Acid or alkali buffering of soil （一） The principle of acid or alkali buffering of soil HAc H+ + Ac￾NaAc + HCl HAc + NaCl Colloid -M + HCl Colloid -H + MCl [ ] [ ] log 酸 盐 pH = pKa +