Abstract
The formation of strongly eluviated soils near the crater lake of Osorezan, Shimokita Peninsula, Aomori Prefecture and the vertical distribution of metal element concentrations (Al, Co, Cu, Fe, Mn, Pb, Ti, and Zn) of the soils were studied as comparison of those of the neighboring a Kuroboku soil (Andosol) and a Podzolic soil. The Kuroboku soil showed an almost uniform vertical distribution of active (acid-oxalate extractable) Al and Fe (Al_o and Fe_o) concentrations. The Podzolic soil possessed the accumulation of Fe_o in the Bs horizon, reflecting the podzolization. On the contrary, the concentration of Al_o and Fe_o in the strongly eluviated soils was lowered in the entire horizons up to 1m depth. The vertical distribution of metal element concentrations were closely related to the soil formation: The concentrations of almost all the metals were remarkably lower as compared with the Kuroboku soil and the Podzolic soil. However, the distribution pattern of Ti which is considered to be less mobile element, showed a relative concentration in the strongly eluviated soils.
