不耕起乾田直播栽培の継続とメタン発生量の関係 : 水稲の不耕起乾田直播栽培が温室効果ガス発生に及ぼす影響(第2報)

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The field studies to clarify the effect of the continuation of the no-tilled rice cultivation with surface application of rice straw on methane emission were carried out throughout rice cultivation period at three rice paddy fields in Okayama, in the western part of Japan. The methane flux was measured in the rice field of Akasaka with high water percolation rate during 1992-1994,Suimon with low water percolation rate during 1994-1997 and Sanyoh with low percolation rate in 1998,under the cultivation of no-tilled direct seeding and tilled transplanting in duplicate about once a week in the rice-cultivated season by using a closed chamber method. 1) The methane emission rate from the no-tilled direct seeding field on the average was 21,47 and 91% of that from the tilled transplanting field in Akasaka, Suimon and Sanyoh, respectively. 2) The difference in the methane emission rate between the fields with the no-tilled cultivation and the tilled transplanting was largest in Akasaka with the highest percolation rate among three rice fields. However, the difference in Akasaka gradually decreased with the continuation of no-tilled direct seeding cultivation because methane emission was gradually increased year-by-year after the surface application of rice straws. 3) The difference in Suimon where the percolation rate was very small became smaller 4 y after the start of the no-tilled direct seeding cultivation, when the soil Eh in the no-tilled direct seeding field was reductive as much as that in the tilled transplanting field. 4) In Sanyoh, with extremely low water percolation rate (4.4 mm d^<-1>) where the no-tilled direct seeding field was continued for 7 y, the methane emission rate in the no-tilled field was about 91% of that in the tilled transplanting field, and both fields were constantly flooded until the final drainage in October without midsummer drainage.
社団法人日本土壌肥料学会の論文
2001-08-05

不耕起乾田直播栽培の継続とメタン発生量の関係 : 水稲の不耕起乾田直播栽培が温室効果ガス発生に及ぼす影響(第2報)

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