Vertical Distribution of Acid-Neutralizing Capacity of Soils
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概要
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By using a simple procedure for measuring acid-neutralizing capacity (ANC) of soil proposed in previous papers, the vertical ANC distribution of soils was investigated down to 1 m in depth at three sites. The soil types (FAO/UNESCO) were Cambisol, Regosol and Andosol. For the Cambisol site, the ANC showed a maximum value of 19.6meq/100g in the uppermost 0?`3cm layer ; it decreased abruptly to about 5 meq/100g within 10 cm depth, and showed almost constant values (2-5 meq/100g) in the deeper layers. For the Regosol site, the vertical ANC pattern was similar tothat observed at the Cambisol site. This pattern gave good agreement with that of NaOH and Na<SUB>4</SUB>P<SUB>2</SUB>O<SUB>7</SUB>-extractable humus content of the soils at each site, indicating that the ANC in the surface layers arises mainly from exchangeable bases in humus. At the Andosol site, the ANC decreased from the ground surface to 10 cm in depth, and then increased gradually with depth. This vertical pattern gave good agreement with the extractable humus content of the soils down to 10 cm in depth and, in the deeper layers, with the amount of Si derived from amorphous minerals in the soils. This indicates that exchangeable bases in humus are the main contributor to the ANC in the surface layers. Whereas in the deeper layers, SO<SUB>4</SUB><SUP>2</SUP>- adsorption by amorphous minerals including allophane dominates the ANC.
- 社団法人 環境科学会の論文
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