Influence of Temperature and Oxygen Availability on the Flux of Methane and Carbon Dioxide from Wetlands : A Comparison of Peat and Paddy Soils

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Methane and carbon dioxide emissions from two Scottish peat soils and two Japanese paddy soils were compared. During aerobic incubation, CH_4 uptake occurred with the peat soils showing a slightly higher activity than the paddy soils. Temperature exerted a marked effect on CO_2 production but had a negligible effect on CH_4 uptake rate except at 30℃ where two soils showed a slight emission of CH_4. At 10 and 20℃, the mean first order uptake rate constant for all soils was 0.19 d^<-1>. With anaerobic incubation, CO_2 production decreased while CH_4 emission was promoted. The highest production (ng CH_4-C g^<-1> fresh wt. soil over 7 d) originated from the indigenous bog peat (4, 500) while that from the other peat soil (10), from an area of drained and forested bog, was less than the production from either paddy soils (290 and 140). The proportion of carbon emitted as CH_4 reached 11% for the bog peat, 1% for the paddy soils but only 0.02% for the forest peat. Though organic matter levels played some role in CH_4 emission, the population level of methanogens determined by previous land use was thought to be the major factor controlling this process. Hence, greater differences, particularly for CH_4 emission, were found between the two peat soils as a result of previous flooding history than was found between the peat and paddy soils.
社団法人日本土壌肥料学会の論文