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To ascertain the relation between the infiltration rate, cover material and hydraulic conductivity of forest soils in Japanese cedar (Cryptomeria japonica) and Hiba arborvitae (Thujopsis dolabrata) plantations, we conducted artificial rainfall experiments using an oscillating nozzle rainfall simulator. The maximum infiltration rate (FIRmax) was higher than that found in previous studies of cypress plantations. Especially in the conditions where surface cover materials are less than 1000 g/m2, FIRmax tends to become higher than the value of the cypress forest by several magnitudes. FIRmax was over 100 mm/h, irrespective of the amount of surface cover materials. The result confirmed little or no correlation between FIRmax and surface cover materials in either of the studied tree species. FIRmax were lower than hydraulic conductivity. FIRmax showed no correlation with hydraulic conductivity and fine fraction content. Therefore, the differences of FIRmax between cedar and Hiba plantation were not explainable by surface cover materials, hydraulic conductivity or the fine soil fraction content, which contrasts with results of previous studies of cypress plantations.

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Relation between Infiltration Rate, Cover Materials and Hydraulic Conductivity of Forest Soils in Japanese Cedar and Hiba Arborvitae Plantation Forests under Artificial Rainfall in Ishikawa Prefecture, Japan