Effects of geology on biogeochemical processes in Japanese forests

蛭石是土壤中控制阳离子交换反应的物质，在日本潮湿的气候条件下，由化学性质不稳定的云母矿物形成。蛭石含量大的母质顺序为：沉积岩（即应）>酸性岩>基性岩、火山灰。高海拔地区土壤中活性铝和铁含量较高，火山岩土壤中活性铝和铁含量极高。它们有助于有机质的积累，通过溶解维持土壤pH，并控制磷的吸附量和强度。

Vermiculite, which controls cation exchangeable reactions in soils, formed from thermodynamically unstable mica minerals under humid climatic conditions in Japan. The amount of vermiculite is large in the following order of parent materials; sedimentary rock (i.e. shall) > acidic rocks > basic rocks, volcanic ash. Active aluminum and iron contents were high in high altitude soils, besides extremely high amounts in volcanic soils. They contributed to organic matter accumulation, maintained soil pH with dissolving, and controlled sorption capacity and intensity of phosphate.