J. Prenzel et Kj. Meiwes, SULFATE SORPTION IN SOILS UNDER ACID DEPOSITION - MODELING FIELD DATAFROM FOREST LIMING, Journal of environmental quality, 23(6), 1994, pp. 1212-1217
Sulfate sorption can modify the reaction of a soil to acid depositions
. Different models of this process exist. In a preceeding paper the ad
sorption isotherm and the solubility product modeling approach have be
en compared and a solubility product model has been introduced. The la
tter model is tested using a forest liming experiment. Concentration d
ata from canopy drip and seepage covering a 20-yr observation period a
re used as 3-yr moving averages. The model assumes a steady seepage fl
ow and uses only one 1-m compartment. The model considers joint chemic
al equilibria for gibbsite, jurbanite, cation exchange, and complexati
on. The seepage pH and concentrations of Al and sulfate under the unli
med reference plot can be modeled if a reduced CEC and a free paramete
r function for alkalinity production are used. The sulfate desorption
caused by liming can be explained by the model. It is concluded that s
orbed sulfate contributes to the lime requirement of an acidified soil
.