Mathematics – Logic
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.4015s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 57, Issue 16, pp.4015-4027
Mathematics
Logic
20
Scientific paper
Anaerobic incubations of paddy soil collected from Konosu, Japan, were carried out for 10 weeks to clarify the general principles that govern the variation of carbon isotopic composition of bacterial methane from freshwater areas. The concentrations and isotopic compositions of CH 4 , CO 2 , and acetate produced in the incubated system were measured. The 13 C value of biogenic CH 4 was highly variable ranging from -60 to -33%., corresponding to changes in its formation pathways: acetate fermentation and CO 2 / H 2 reduction. Acetate accumulated only during the first week. After it became depleted, acetate production completely limited CH 4 production. The 13 C value of the methyl carbon of acetate, which was accumulated with addition of inhibitor for methanogenesis, ranged from -43 to -30%.. The 13 C value of methane from acetate was estimated to be -43 to -30%., after acetate depletion. The 13 C value of CH 4 from CO 2 / H 2 reduction was estimated to be -77 to -60%.. An enrichment in 13 C of CO 2 localized around the site of methanogenesis was suggested. CO 2 produced in situ during methanogenesis (e.g., CO 2 from carboxyl group of acetate) was possibly utilized as well. Using the above 13 C values of two endmembers of CH 4 , the change of acetate contribution for CH 4 production was calculated: less than 12% until week 1, 65 to 100% at weeks 1 to 3, 16 to 28% at weeks 3 to 5, and 35 to 40% after week 5. Variability of CH 4 13 C resulted from the difference in contribution of each biological process. Also, the 13 C value of CH 4 was a useful indicator for assessing the contribution of each process to methane production in sulfate depleted freshwater areas.
Sugimoto Atsuko
Wada Eitaro
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