Abstract
We measured the concentrations of dissolved iron (Fe_d) and aluminum (Al_d) in stream water in two forested catchments in Kyoto Prefecture. The average Fe_d concentration ranged from 0.39 to 1.25μmol 1^<-1> and that of Al_d from 0.38 to 1.14μmol 1^<-1>. Fe_d concentration increased in summer and decreased in winter. A similar seasonal pattern was observed for dissolved organic carbon(DOC). Fed_ and Al_d concentrations correlated significantly with DOC concentration, suggesting that Fe_d and Al_d in stream water are complexed with organic matter. In addition, the Al_d apparently had little bad influence on organisms in the stream because it was present in low concentrations and because it was part of an organic complex.
