山林河川における流域特性と水質との関係について

概要

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Statistical analyses were applied to data obtained from 9 watersheds, almost all of them forested in order to elucidate the relationship among basin characteristics such as land cover, geologic features, proportion of natural forest cover, forest age, river water qualities, etc. The water quality variables measured during dry weather periods were classified into 3 groups, i.e., 1) NO3-N, NH4-N, DTN, DON, DOC, dry weight, POC, PON, 2) Ca2+, Mg2+, Na+, K+, Cl-, SO42-, 3) PO4-P, DTP, TP, Si. The items of group 1) have positive correlations with the portion of the basin which was eroded ; those of group 2) have negative correlations with annual rainfall ; those of group 3) have positive correlations with mean forest age. For rainy periods, the items of group 1) exhibited positive relationships with water discharge ; therefore a survey considering the discharge change is necessary to evaluate their loads. Higher concentrations of dry weight, NH4-N, etc. were observed in the basin with more area in tree plantations during rainy periods, but not during dry periods.
社団法人　日本水環境学会の論文
1995-11-10