You are here:
ACIDIFICATION AND RECOVERY OF A SPODOSOL BS HORIZON FROM ACIDIC DEPOSITION
Citation:
Dahlgren, R., D. McAvoy, AND C. Driscoll. ACIDIFICATION AND RECOVERY OF A SPODOSOL BS HORIZON FROM ACIDIC DEPOSITION. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-90/539.
Description:
A laboratory study was conducted to examine acidification and recovery of a Spodosol Bs horizon from acidic deposition in the Bear Brook Watershed (BBW) in central Maine. echanical vacuum extractor was used to draw solutions through a soil column at three treatments containing 40, 100, or 160 umol/L SO4 2-. ollowing 44 d of leaching, all treatments were decreased to the 40 umol/L SO4 2- level to examine recovery from acidification. cidic additions were initially neutralized by release of basic cations and sulfate adsorption. ollowing attainment of steady state conditions for basic cations and SO4 2- with respect to the soil adsorption complex, Al dissolution was the primary neutralization mechanism. queous Al activities appeared to be regulated by equilibrium with an Al(OH)3 mineral phase. ollowing decreases in acid loadings, recovery was rapid resulting in retention of basic cations, reversible release of SO4 2- and a marked reduction in the concentrations of soluble Al.