Abstract
The chemical properties of leachates percolating through A_0 and surface soil (A horizon) using by micro-lysimeter method were analyzed in a Cryptomeria japonica stand and a deciduous broadleaved forest (dominated by Quercus serrata) at Sanbe Forest of Shimane University. The pH of water through A_0 layer was lower than that of through-fall in the Quercus forest. The Ca and NO_3 concentrations of water through A horizon in the Cryptomeria forest, and NO_3 concentration of water through A_0 layer in the Quercus forest, are lower than those of through-fall. Al concentrations of both forests increased from autumn to winter, but are extremely low compared with the spraying experiment of artificial acid rain. Amounts of ions leaching from surface soil are greater in Cryptomeria forest than in Quercus forest. The rates from A_0 layer to total amount of ions leaching were 23〜50% for Ca, 39〜43% for Mg, 18〜36% for K, 21〜62% for Cl, 3〜222% for NO_3, 8〜60% for SO_4, and 41〜56% for Al, respectively. These rates were high in the Quercus forest, except for Mg, Na, NH_4.
