Abstract:We investigated nutrient concentrations, during periods of low streamflow, from medium-scale watersheds (5.1-15.3 km 2 ) with paddy fields. Data were collected both during irrigation and non-irrigation periods, from 1996 to 2000. Mean total nitrogen (TN) concentration during irrigation periods (2.6 mg l À1 ) was significantly lower than during non-irrigation periods (6.2 mg l À1 ), most likely due to the dilution effect of higher discharge and nitrogen removal in the forest and paddy field by denitrification. … Show more
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