花崗岩由来の褐色森林土を用いた人工酸性雨によるカラム実験

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In order to clarify the effect of acid rain on the forest soil, that is, the relationship between acidneutralizing capacity of soil and aluminum ion concentration in the soil solution, artificial acid rains such as pH 4.0, 3.5, 3.0, and 2.0 solutions regulated by sulfuric acid and deionized water as a control were added to the column filled with brown forest soil derived from granite which is one of the most popular forest soils in Japan. The results obtained are as follows; 1) When buffer actions by exchangeable cations and ammonium ion derived from the chemical decomposition of nitrogenous organic matter are not enough to prevent acidification of soil by acid rain because the base saturation of the soil is very low, bases are also dissolved from minerals in soil even at the beginning stage of experiment where the soil pH is not so declined. 2) When pH value of soil solution is maintained at the same level as that of the original soil or within the lowering of 0.4 unit from pH value of the original soil through those buffer actins, exchangeable aluminum ion is only released a little. 3) When pH value of soil solutionbecomes 0.5 unit lower than that of the original soil, a consederable amount of aluminum ion is leached out from the column due to the release from the adsorption complex of soil and the dissolution of aluminum compound. 4) When pH value of soil solution becomes 1.0 unit lower than that of the original soil, the breakdown of minerals in soil begins and a lot of aluminum ion and bases are leached out from the column.
森林立地学会の論文
1991-12-30

花崗岩由来の褐色森林土を用いた人工酸性雨によるカラム実験

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