寒冷地水田における水稲生育にともなう水管理がメタン発生に及ぼす影響

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Methane emission from rice paddy fields (with or without rice straw application) was measured in Yamagata, a cold district of Japan, from 1992 to 1994. The characteristics of methane emission and influence of rice plant growth and mid-summer drainage on methane emission are as follows. 1) Methane emission from the rice paddy fields in the cold district was less than that of warm districts during the early growth stage of rice in June. Methane emission increased in July and August as (soil) temperature rose. 2) In years when rice plants grew briskly in the early growth stage, complete mid-summer drainage was needed to control plant growth, which in turn suppressed methane emission. In the case that weather in July and August was unusually cool, the rise in soil temperature was held down and the emission rate of methane was decreased. 3) In the case of poor rice plant growth and high soil temperature after mid-summer drainage, the emission rate of methane increased. 4) As the result of multiple regression analysis, the influences of soil reduction and temperature were different before and the mid-summer drainage. 5) These results suggested the importance of cultivation management for the suppression of methane emission and the maintenance of rice yield as follows. (1) Sufficient rice plant growth must be kept by appropriate ponding to keep soil temperature high, which enables strong mid-summer drainage. (2)After mid-summer drainage, soil oxidation and a drop in soil temperature would be anticipated by appropriate intermittent irrigation.
社団法人日本土壌肥料学会の論文
2000-10-05

寒冷地水田における水稲生育にともなう水管理がメタン発生に及ぼす影響

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