風化土層中の溶出過程に及ぼす標高の影響 : 関東山地花崗閃緑岩地域の例

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In order to clarify the variations of dissolution processes from regolith materials with elevation, and to estimate the role of soil temperature, CO_2 concentration and microbic activities on the dissolution processes, field observations and chemical analysis were conducted. Data for this study was collected in four small catchments in a part of the Kanto Mountain Range, which consists of granodiorite, located about 80 km west of Tokyo. Catchments were sampled at elevation of 700 m, 1200 m, 1500 m, 1900 m, respectively. The solute concentrations of spring water and soil water increased as the elevation decreased. Cation and SiO_2 concentrations of soil water were related to organic acid concentrations, which were estimated from cation-anion balances, in the surface soil layer (10 cm ≦ D ≦ 50 cm) whereas bicarbonate concentrations in the deeper soil layer (75 cm ≦ D). SiO_2 concentrations of soil water varied seasonally at lower catchment. Organic acid concentrations in the surface soil layer showed not only seasonal variations but also variations depending on altitude change. There were no apparent differences in CO_2 concentrations in the soil air among the four catchments. These results suggest that the contribution of organic acids to dissolution processes of cation and SiO_2 in the surface soil layer whereas CO_2 in the deeper soil layer. Soil temperature as an index of altitude controlled biochemical processes that produced organic acids, and affected the cation dissolution process indirectly in the surface soil layer. On the other hands, soil temperature controlled the reaction rate of chemical weathering directly in the deeper soil layer.
日本地形学連合の論文
2002-01-25

風化土層中の溶出過程に及ぼす標高の影響 : 関東山地花崗閃緑岩地域の例

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