Methane Emission from Paddy Field (Part 1):Effect of Fertilization, Growth Stage and Midsummer Drainage : Pot Experiment

概要

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Pot experiment was conducted to elucidate the effects of soil type (Brow Lowland Soil and Gray Lowland Soil), type of fertilization, and growth stage of rice plant on the methane emission fluxes from paddy field. The methane emission fluxes from non-planted plots kept very low level and they were 1/3 to 1/500 of respective planted plots. Among the planted plots, the emission fluxes were far larger in the rice straw applied plot than in other plots up to the heading stage. The methane emission fluxes in the chemical fertilizer plot increased steadily along the growth stage and it maintained high level during its ripening stage. From the total methane emission calculated separately before and after the heading stage, it was known that the main stage when the manurial treatment and soil type reflect on the methane emission is in the early growth stage (before the heading stage), and that methane emission is similar each other and large in the late stage (after the heading stage), irrespective of manurial treatment and soil type. Thus, it is considered that the methane emission in the late stage is controlled by the rice plant itself. maybe by means of root exudates and slough-off. Midsummer drainage decreased the methane emission in the late stage effectively in spite of short drainage period.
社団法人環境科学会の論文