This study was conducted to investigate the effects of forest fire on the water quality and quantity. The burned watershed had been damaged by forest fire broken out in April, 2000. An unburned watershed was selected to compare with the burned watershed. Monitoring parameters were precipitation, water level, BOD, COD, TN, TP, Cl~-, NO_3~-, Na~+, Mg~(2+) and SS, and the monitoring was continued from June to September, 2000. Hydrograph separations in two watersheds during 2 months in 2000 resulted thatthe rates of direct runoff and base flow in the burned watershed were 41 and 59, whereas those represented 22 and 78 in the unburned watershed. The periodic mean concentrations of each water quality parameters measured in the burned watershed were higher than those in the unburned watershed. Especially, there were big differences between the periodic mean concentrations of TN, TP, NO_3~- and SS under the burned and unburned watershed. Also, there were wide differences between monthly mean concentrations of each parameter under the burned and unburned watershed in June, 2000. However, those differences were smaller in a lapse of time. In particular, there weren't distinctive differences between monthly mean concentrations of each parameter under the burned watershed and those under the unburned watershed from August, 2000. Therefore, it was concluded that the effects of forest fire on the streamwater quality were decreased after four months forest fire broke out.
展开▼
