抄録
The prediction of pH of soil was studied by applied semiempirical model. The disturbed and undisturbed soil samples were taken from cedar forest in Kumamoto, Japan. The soil type was Cambisol. The soils samples of horizin A and B1 were used for laboratory experiments. The ANC (acid-neutraling capacity) and BS (base saturation) showed that 8.4meq/100g (24.7%) and 1.9meq/100g (7.7%) were found in A and B1 horizon, respectively. The soils were watered with 0.5meq/l sulfuric solution (pH3.6) and with rainwater acidified to pH 3.6 and 3.0 using a mixture of sulfuric and nitric acid. The graph of pH of soil solution and log (BS/(100-BS)) was plotted for disturbed soil samples, whereas pH and pAl for undisturbed soil samples. Both graphs statisfied the relevant linear regression equation used. The equilibrium diagram also showed that the data obtained can be fitted better with Al (OH) SO4 curve. These data were used for calculation of pH of soil solution and depletion of BS. The simulated values agreed with measured ones that was conducted using sequance batch method in soil of A-horizon.
