<報文>釧路湿原におけるメタン, 一酸化二窒素, 水素のフラックスと微生物過程

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Fluxes of radiatively active gases such as methane and nitrous oxide at different vegetations (low moor, alder forest and high moor) in Kushiro wetland, Hokkaido Japan, were measured by the chamber method in summer seasons from 1993 to 1997. Hydrogen gas fluxes were also measured simultaneously with methane fluxes by SCD (Semi-conductor detector) GC in order to understand microbial metabolism in the wetland. Distribution of several microbial groups concerning with nitrogen cycling were also studied for understanding nitrous oxide fluxes. Following results were obtained. (1) Methane fluxes at low moor sites were 2-3 times higher than those in another vegetation sites, and correlated loosely with average air temperature during observation period. (2) In contrast to methane fluxes, dissolved methane concentrations in surface water at low moor site were the lowest, and those in high moor site were the highest. (3) Absorption and emission fluxes of hydrogen were observed at high and low moor, respectively. These results suggest different mechanism of methane production between high and low moor sites. (4) Free living nitrogen fixer was dominant than the other groups of nitrogen cycling bacteria in high moor and it was not detected in low moor where aerobic heterotrophs, denitrifiers and NH_4-oxidizers were most abundant. (5) Surface water both in low and high moor was under-saturated with dissolved nitrous oxide. Influxes of nitrous oxide into low and high moor were sometimes observed. Absorption mechanisms of nitrous oxide in low and high moor were discussed.
2002-03-31

<報文>釧路湿原におけるメタン, 一酸化二窒素, 水素のフラックスと微生物過程

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