IngentaConnect Temperature Dependence of Methane Production in Tropical Rice Soi...

Abstract:

Although CH₄ production is sensitive to temperature, it is not clear how temperature controls CH₄ production directly versus the production of organic substrates that methanogens convert into CH₄. Therefore, this study was done to better understand how CH₄ production in rice paddy soil responded to temperature when the process was not limited by the availability of substrates. In a laboratory-incubation study using three Indian rice soils under flooded conditions, the effect of temperature on CH₄ production was examined. CH₄ production in acid sulphate, laterite, and alluvial soil samples under flooded conditions distinctly increased with increase in temperature from 15°C to 35°C. Laterite and acid sulphate soils produced distinctly less CH₄ than alluvial soils. CO₂ production increased with increase in temperature in all the soils. The readily mineralizable carbon C and Fe²⁺ contents in soils were least at 15°C and highest at 35°C, irrespective of soil type. Likewise, a significant correlation existed between microbial population (methanogens and sulphate reducers) and CH₄ production. Comparing the temperature coefficients (Q₁₀) for methane production within each soil type at low (15°C-25°C) and medium (25°C-35°C) temperature intervals revealed that these values were not uniform for both alluvial and laterite soils. But acid sulphate soil had Q₁₀ values that were near 2 at both temperature intervals. When these soil samples were amended with substrates (acetate, H₂-CO₂, and rice straw), there were stimulatory effects on methane production rates and consequently on the Q₁₀ values. The pattern of temperature coefficients was characteristic of the soil type and the nature of substrates used for amendment.

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Temperature Dependence of Methane Production in Tropical Rice Soils