Estimation of mineral weathering rates under field Conditions based on Base cation budget And strontium isotope rations

摘要

Base cation (BC) concentrations of rain, throughfall, percolation from leaf litter, and soil solution were periodically measured in two forests: Kannondai (red pine stand on volcanic soil) and Yasato (deciduous stands on granitic soil). Calculation of a BC budget gave the rate of BC Release From soils; the BCs originated from mineral weathering and cation exchange. Weathering rates Under field conditions were estimated from the Sr isotope ratios (~87Sr/86Sr) of water and soil sam- Ples.