抄録
Quantity and quality of Coarse Particulate Organic Matter (CPOM) was investigated in Nakatsugawa River, Saitama during five floods occurred between July 2005 and September 2007. CPOM drift density, and fiber components were compared, Peak discharge was ranged from 54.3 m3/s in winter to 702.4 m3/s in autumn. For winter, summer and autumn flood, average drift density was ranged from 0.21 g/m3, 1.52 g/m3 and 2.84 g/m3 (dry weight), respectively. In high flood magnitude, CPOM was found to have highest in lignin but lowest in soluble organics. Conversely, in lower flood magnitude, exports were dominated by low lignin CPOM with high in soluble organics. There was a significant correlation between discharge with lignin (r =0.666, p<0.01) as well as with soluble organics (r = -0.722, p<0.01), Correlation in both hemicellulose and cellulose with discharge was not found, C:N was high in all floods ranged from 30.0 to 34.9, but TP was generally low (0.04%), Based on the quality, exported CPOM was different significantly between floods and are highly affected by flood timing and magnitude.
