非栽培期間中の地下水位の長期管理が水田からのメタンフラックスに及ぼす影響

概要

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In order to understand the effect of groundwater level on methane emission from submerged paddy soil during the fallow season, methane flux was measured during the cropping season of 1996 at the lysimeter of Sandy soil, Loam soil, Clay soil and Peat soil, of which the groundwater level was kept at 0 or -30 cm during the fallow seasons from 1985 to 1995 and at -1.2 m in 1995-96. Methane fluxes at -30 cm plots were higher than that at the 0 cm plot, especially in Peat soil and Sandy soil. From these soils, methane emission from -30 cm plots started even in the early period of submergence. Cumulative amounts of emitted methane from -30 cm plots during the cropping season were 1.8, 1.2, 1.2 and 3.5 times higher than those from the 0 cm plots of Sandy soil, Loam soil, Clay soil and Peat soil, respectively. The amounts of free iron oxide in -30 cm plots tended to be smaller than those in 0 cm plots, particularly in Peat soil, which would be one of the reasons for higher methane emission from -30 cm plots.
社団法人日本土壌肥料学会の論文
1999-04-05