高濃度硝酸態窒素含有地下水の流入するアシ湿地における脱窒速度の実測

概要

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Denitrification rates were directly measured by acetylene inhibition technique in a reed bed receiving ground water with high nitrate concentration. Aboveground biomass of reed showed its seasonal maximum (30gN·m-2) in July, when its rhizome reached 40cm and its root 60cm depth, respectively. Total organic carbon content was high in the surface sediment (0-15cm), ranging from 50 to 180mgC·g-1 dry weight. Nitrate concentration in the pore-water varied between sampling dates; high nitrate concentrations of 10-40mgN·l-1 were observed from surface to 15cm depth on some dates, whereas 1-10mgN·l-1 was detected only in the 0-2cm layer on other dates. Denitrification rates on 24 April, 1992 ranged from 200 to 600ngN·cm-3·h-1 between surface and 15cm depth. The rates on other dates, however, were one to two orders less than those values, and denitrification was restricted to 0-5cm sections on most cases. Areal denitrification rates ranged from 1 to 1,200mgN·m-2·d-1, with an integrated annual value of 112gN·m-2·yr-1. Denitrification rates at greater depths (20-160cm) were very low or less than detectable limit in mid-July when the reed aboveground biomass reached its seasonal maximum.
社団法人　日本水環境学会の論文
1995-05-10