Emission and Production of Methane in the Paddy Fields of Japan

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X

Rates and variations of methane (CH4) emission and production in the paddy fields in Japan were analized. CH4 emission from paddy fields showed strong seasonal variations, depending on soil Eh, water management, and mineral fertilizer applied. The emission rate widely varied with soil types during the cultivation period. Annual emission rates from paddy fields composed of Peat soil, Gley soil, and Andosols are estimated at 44.8, 8.0-27.0, and 0.6-12.6 g-CH4/m2, respectively. Application of rice straw with rates of 6-9 t/ha increased the CH4 emission rates by 1.8- to 3.5-fold. The CH4 production rates of paddy soils measured under the laboratory incubation experiments also showed seasonal variations, which were well correlated with the CH4 emission rates measured in the paddy fields. These results indicate that the seasonal variations of CH4 emission from paddy fields to the atmosphere are mainly brought about by the variation of CH4 production in paddy soils. However, the ratio of the production rates to the emission rates varied among soils, suggesting that physical and chemical properties of soils play a significant role for production and emission of CH4 in the paddy fields.

作成者 Kazuyuki YAGI Katsuyuki MINAMI
国立情報学研究所メタデータ主題語彙集(資源タイプ) Journal Article
開始ページ 165
終了ページ 171
言語 eng