中国南東部と日本で採取された酸性化土壌と酸性化の程度が低い土壌中における植物生育に利用される11の元素の分布を評価するために,H₂O, 1M CH₃COONH₄ (pH7, pH4.5), 2.5% CH₃COOH, 0.1M NH₂OH+HCl, 6% H₂O₂, 0.2M (NH₄)₂C₂O₄+0.2M H₂C₂O₄, 0.2M (NH₄)₂C₂O₄+0.2M H₂C₂O₄+0.1M C₆H₈O₆,HNO₃+HClO₄+HFを用いて逐次抽出実験を行った.中国の酸性化土壌では,他の酸性化程度の低い土壌と比べて,Ca, Mg, K, Mnにおける水溶態と交換態の割合が低かった.一方で,Cu, Al, Fe, Zn, Pにおける酸化物結合態の割合が低く,Cu, Al, Fe, Znにおける水溶態と交換態の割合が高くなり,Pにおける有機物結合態の割合が高くなった.これらの結果から,酸性化土壌において,植物生育に利用されるCa, Mg, K, Mn, Pの欠乏と,Fe酸化物から移動しやすい形態へのCu, Al, Fe, Znの溶出が生じると考えられる.In order to assess the distribution of the eleven plant-available elements in the acidified and slightly acidified soils collected in southeastern China and central Japan, a sequential extraction procedure using H₂O, 1M CH₃COONH₄ (pH7, pH4.5), 2.5% CH₃COOH, 0.1M NH₂OH+HCl, 6% H₂O₂, 0.2M (NH₄)₂C₂O₄+0.2M H₂C₂O₄, 0.2M (NH₄)₂C₂O₄+0.2M H₂C₂O₄+0.1M C₆H₈O₆, and HNO₃+HClO₄+HF was performed. The percentages of the water-soluble and exchangeable Ca, Mg, K and Mn in acidified soils were lower than those in the slightly acidified soils. On the other hand, the acidified soils were more depleted in the relative amounts of Cu, Al, Fe, Zn and P bound to oxide and were enriched in those of the water-soluble and exchangeable Cu, Al, Fe and Zn and P bound to organic matter than another soils. These results demonstrate that the lack of plant-available Ca, Mg, K, Mn and P and the leaching of Cu, Al, Fe and Zn from Fe-oxide to mobile fraction occur in the acidified soil.