Comparison of indirect nitrous oxide emission through lysimeter drainage between an Andosol upland field and a Fluvisol paddy field(Environment)
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概要
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Indirect emission of nitrous oxide (N_2O) due to nitrogen (N) leaching and runoff from agricultural soils is a major source of atmospheric N_2O. To evaluate the effect of agricultural land use in combination with soil type on indirect N_2O emission through groundwater, we compared the indirect N_2O emission between an upland field of Andosol and a paddy field of Fluvisol in a 1-year lysimeter experiment. We established a shallow groundwater table during the non-flooded fallow period in the Fluvisol paddy field to simulate moisture conditions in a lowland soil. Drainage was 795mm yr^<-1> (median, n=6) in the Andosol upland field, versus 1583mm yr^<-1> in the Fluvisol paddy field due to flooding during part of the year. The total leached nitrate in the Andosol upland field (4.24g N m^<-2>yr^<-1>) was comparable to that in the Fluvisol paddy field (5.57g N m^<-2>yr^<-1>). The total indirect N_2O emission in the Fluvisol paddy field (88.6mg N m^<-2>yr^<-1>) was 55 times that in the Andosol upland field (1.62mg N m^<-2>yr^<-1>). The daily indirect N_2O emission during the flooded period (0.239mg N m^<-2>d^<-1>) was comparable to that in the non-flooded period (0.156mg N m^<-2>d^<-1>) in the Fluvisol paddy field. The decrease in dissolved N_2O concentration due to the flooding was offset by the increase in the drainage volume. The groundwater emission factors (EF_<5g>) were 0.0003 in the Andosol upland field and 0.0160 in the Fluvisol paddy field versus the IPCC default value of 0.0025. Although the lysimeters had some limitations to simulate actual field conditions, the results indicate that agricultural land use in combination with soil type can strongly affect indirect N_2O emission through groundwater.
- 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
National Institute for Agro-environmental Sciences
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Hayakawa Atsushi
National Institute For Agro-environmental Sciences
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Yagi Kazuyuki
Carbon And Nutrient Cycles Division National Institute For Agro-environmental Sciences
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AKIYAMA Hiroko
National Institute for Agro-Environmental Sciences
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Akiyama H
National Institute For Agro-environmental Sciences
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Minamikawa Kazunori
Univ. Tsukuba Ibaraki Jpn
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Nishimura Seiichi
National Institute For Agro-environmental Sciences
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Akiyama Hiroko
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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HAYAKAWA Atsushi
Carbon and Nutrient Cycles Division, National Institute for Agro-Environmental Sciences
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NISHIMURA Seiichi
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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Hayakawa Atsushi
Carbon And Nutrient Cycles Division National Institute For Agro-environmental Sciences:(present Offi
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