Abstract
To determine the geological distribution of acid buffering capacity and exchangeable Al of forest soils in Japan, surface soils under forest vegetation were collected nationwide from a total of 1,034 sites. Generally, surface soils in Japanese forests are mostly acidic and low in both exchangeable cation content and exchangeable Al. The median of soil pH(H2O), total exchangeable cations, and exchangeable Al are 5.1, 76 mmol(+)Kg−1, and 19.6 mmol(+)kg−1, respectively. Acid buffering capacities of selected soils were determined using a soil column, which was comparable to the capacity that resulted from cation exchanges with protons. Soils with high buffering capacity and low exchangeable Al are widely distributed in Japan, and overlap with the areas of Andisol distribution. Volcanogenic materials seem to mask soil characteristics derived from underlying geology even though they are not Andisols. However, central to western Honshu Island, Shikoku Island, and northern Kyushu Island showed weak acid buffering capacities with high exchangeable Al potential in surface soils.
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Takahashi, M., Sakata, T. & Ishizuka, K. Chemical Characteristics and Acid Buffering Capacity of Surface Soils in Japanese Forests. Water, Air, & Soil Pollution 130, 727–732 (2001). https://doi.org/10.1023/A:1013885518767
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DOI: https://doi.org/10.1023/A:1013885518767