抄録
The quality of soil solutions were analyzed in a forested ecosystem. Exchangeable Ca, Mg, Na, K, available P and total N in the soil were rich in the soil surface and decreased with soil depth. The distribution curves of the soluble chemical concentrations along the soil profile were divided into four groups. NO_3^-, Ca^<2+> and Mg^<2+> increased in the soil. The correlation between NO_3^-, Ca^<2+> and Mg^<2+> were significant (r>0.8, p<0.01). Therefore it was supposed that formed NO_^-3 leached out Ca^<2+> and Mg^<2+> in the soil. Total-P and NH_4^+ concentrations decreased in the litter layer, because of biological immobilization. The concentrations of K^+, SO_4^<2-> and organic-N also decreased with soil depth due to mineralogical adsorption and biological immobilization. Both concentrations of Cl^- and Na^+ were constant throughout the soil profile. These were attributed to inertness of Cl^- and reversible adsorption and leaching of Na^+.
