Pedogenetic Acidification Process of Forest Soils in Northern Kyoto

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A natural process of soil acidification in the pedogenesis of the forest soils (i.e. brown forest soil and podzolic soil) in the northern Kyoto area was studied with special reference to the dynamic of amorphous and exchangeable Al in the profiles. The very low base saturation with low pH of the samples soils showed that all the profiles were highly acidified. The amount of exchangeable Al was largest at the surface in the brown forest soil profiles, whereas it was largest in the E to B horizons in the podzolic profiles. These findings suggested that soil acidification affected the deeper horizons in the podzolic profiles. To analyze the mechanism involved in the pedogenetic acidification process, acid and alkali titrations of the sampled soils were performed. The titratable alkalinity was highly correlated with the amorphous Al content (Alo) among various soil properties, suggesting its importance in the in situ acid buffering by the solid phase of the forest soils. On the other hand, the titratable acidity was contributed by the contents of exchangeable Al and organic carbon, the latter forming complexes with amorphous Fe and/or Al. Pedogenetic acidification was considered to involve both an increase and a subsequent decrease of the titratable acidity ; that is, an increase in the amount of organo-mineral complexes in the C to B horizons, an increase in the amount of exchangeable Al in the upper B horizons, and a decrease in the amount of both organo-mineral complexes and exchangeable Al in the E horizon of the podzolic profiles.
社団法人日本土壌肥料学会の論文

Pedogenetic Acidification Process of Forest Soils in Northern Kyoto

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