Groundwater-induced emissions of nitrous oxide through the soil surface and from subsurface drainage in an Andosol upland field : A monolith lysimeter study(Mitigation of methane and nitrous oxide emissions from agricultural lands)
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概要
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Nitrous oxide (N_2O) produced in shallow groundwater has two emission pathways to the atmosphere: dissolution in subsurface drainage and groundwater and later degassing from water surfaces open to the atmosphere, and upward gas diffusion. N_2O undergoing upward diffusion through the soil surface cannot usually be distinguished from N_2O produced in the topsoil. To evaluate the emission pathway and rate of groundwater-induced N_2O, we conducted a one-year experiment using monolith lysimeters containing 1 m-long undisturbed Andosol. We measured emission of N_2O via the soil surface and dissolved N_2O emitted via subsurface drainage from the non-planted lysimeters under two conditions without fertilizer-nitrogen (N) addition: (1) with the groundwater table at 0.9 m depth (GW), and (2) without any groundwater table (nonGW). Total soil surface N_2O emissions in the GW and nonGW treatments were 21.0±6.3 and 17.0±1.1mgNm^<-2>yr^<-1>, respectively (mean±standard error, n = 3), and the difference between the two treatments was not significant. Total dissolved N_2O emissions via drainage in the GW and nonGW treatments were 11.40±5.68 and 0.42±0.03mgNm^<-2>yr^<-1>, respectively. The presence of groundwater significantly increased dissolved N_2O emission under zero fertilizer-N addition. This is due to the one to three orders of magnitude higher concentration of dissolved N_2O in the GW treatment. Our results indicate that the presence of groundwater increases total N_2O emissions from an Andosol upland field via these two pathways.
- 一般社団法人日本土壌肥料学会の論文
著者
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Yagi Kazuyuki
Carbon And Nutrient Cycles Division National Institute For Agro-environmental Sciences
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Minamikawa Kazunori
Carbon And Nutrient Cycles Division National Institute For Agro-environmental Sciences
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Maeda Morihiro
Graduate School Of Environmental Science Okayama University
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IHARA Hirotaka
Division of Soil Science and Plant Nutrition, NARO Agricultural Research Center
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EGUCHI Sadao
Carbon and Nutrient Cycles Division, National Institute for Agro-Environmental Sciences
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NISHIMURA Seiichi
Division of Soil Science and Plant Nutrition, NARO Agricultural Research Center
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KOMADA Michio
Division of Soil Science and Plant Nutrition, NARO Agricultural Research Center
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