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- W2032077688 abstract "The quality, quantity, and origin of suspended organic matter were studied in the highly agricultural Upper Scioto River in Central Ohio. Late summer baseflow conditions were compared to late autumn high flow conditions. Variables examined in the suspended matter were the total suspended solids concentration, semi-quantitative concentrations of lignin, carbohydrate concentrations, total organic C, total and organic P, and δ-13C. Also examined were ratios of C to N, organic C to organic P ratios and fluxes of total organic C. The primary hypothesis of this research was that the quality (or biodegradability) and quantity of organic matter in the Upper Scioto River would increase during autumn stormflow conditions due to inputs of fresh terrestrial organic matter. The autumn suspended matter was also expected to reflect C4 plant contributions from corn organic matter. Results show that the quality and quantity of organic matter were greater during summer, as reflected in low molar ratios (178:1) of organic C to organic P, and higher organic C content of the suspended matter in summer. Summer suspended matter was 3.6% organic C and autumn suspended matter was 2.3% organic C. Carbon to N molar ratios in both seasons were very close to the Redfield ratio (6.6:1 in summer and 6.7:1 in autumn). Total suspended matter and total organic C concentrations were lower in autumn (8.7 mg/l−1 TOC and 17.7 mg/l−1 TSS) than in summer (17.5 mg/l−1 TOC and 39.0 mg/l−1 TSS), but the fluxes were greater in autumn due to greater stream flow. Stable isotope analyses suggested a phytoplankton or C3 plant source (most likely corn) for summer organic C (mean δ13C of −24.8‰) and a phytoplankton or C4 plant source for autumn organic matter (δ13C=−21.5‰)." @default.
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- W2032077688 date "2004-07-01" @default.
- W2032077688 modified "2023-10-08" @default.
- W2032077688 title "Organic matter sources and transport in an agriculturally dominated temperate watershed" @default.
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- W2032077688 doi "https://doi.org/10.1016/j.apgeochem.2004.01.010" @default.
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