立山弥陀ヶ原の泥炭土壌におけるメタン放出量の変動

概要

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Measurements of CH_4 emission and soil temperature on a small bog margin at 1,900 m elevation in the Tateyama Midagahara (36°34'N, 137°33'E) were made on a monthly basis from June to November during 1997-1998. The CH_4 fluxes determined by a static chamber technique ranged from 0.31 to 270 mg CH_4-Cm^<-2>day^<-1> and were related to peat temperature. There was a positive relationship between precipitation and CH4 flux: larger precipitation led to larger fluxes. The CO_2 flux ranged from 0.026 to 2.8 g CO_2-C m^<-2>day^<-1> and strongly correlated with CH_4 flux. Determinations of carbon isotopic compositions in CH_4 and CO_2 revealed δ^<13>C values of -60.9 to -72.9‰ and -19.2 to -24.9‰, respectively. Comparision of S13C signatures between CH_4 and CO_2 suggested that CH_4 oxidation is not an important overall control on CH_4 emission and indicated that most of the CH_4 was formed by mixture of acetate fermentation and CO_2 reduction pathways.
日本地球化学会の論文
2004-06-05