Early diagenesis of organic matter in water of Lake Haruna. (I) Flux of organic matter to the bottom by determination of carbon and nitrogen of sediment trap sample, particulates and sediments.:Flux of Organic Matter to the Bottom by Determination of Carb

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Sediment traps were deployed in Lake Haruna for 25 days for investigation of early diagenesis of organic matter. Carbon and nitrogen of the trap sample were compared with those of particulates and sediments. The daily flux of particles, carbon, nitrogen, and inorganic matter to the trap was 3.5 g·m-2·d-1, 0.37 g·m-2·d-1, 0.050 g·m-2·d-1, and 2.76 g·m-2·d-1, respectively. The percentages of retention of biogenic elements in 4 m-layer particulate, in which biogenic elements were most abundant, in the sediment trap sample, fresh sediment and sediment were 19, 18, and 17%, for carbon respectively, and 15, 12, and 9%, for nitrogen, respectively. Thus, the trap sample seems to have been subject to sufficient biodegradation during the deployment. The particulate standing mass above 12 m layer were 38.6 g·m-2 in total weight, 10.7 g·m-2 in carbon, 1.83 g·m-2 in nitrogen, and 17.2 g·m-2 in inorganic matter. The mean percentages of the matter settling in the trap to the standing mass were 9%·d-1 for total weight, 3.5%·d-1 for carbon, 2.7%·d-1 for nitrogen, and 16%·d-1 for inorganic matter, respectively. The average settling velocity of the particles was 1.9 m·d-1, this was comparable to 1.54±0.22 m·d-1, which is an average settling velocity of particles, 10-64 m in size.
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