Dissolved N_2O, CH_4, and CO_2 Emissions from Subsurface-Drainage in a Structured Clay Soil Cultivated with Onion in Central Hokkaido, Japan (Soil Physics)
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概要
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In the soil system, the greenhouse gases (N_2O, CH_4, and CO_2) are produced by microbes or root respiration. These gases diffuse into the atmosphere directly. At the same time, they leach into ground water after their dissolution into drainage water. The dissolved gases are secondarily emitted after drainage water is discharged to the ground surface. From April 2000 to March 2001, we measured these greenhouse gas emissions through subsurface-drainage in a gray lowland soil in central Hokkaido, Japan. Direct emissions of N_2O, CH_4, and CO_2 from the soil surface were also measured. The concentration of each gas was several orders higher than the concentration equilibrated with ambient air. The CH_4 concentration ranged from 1.0 to 113 μg CH_4-C L^<-1> and was lower in the growing season (May-October) due to oxidative soil conditions. The N_2O concentration ranged from 19.3 to 189 μg N_2O-N L^<-1> and was higher in the growing season. The increase in the N_2O concentration was probably due to an increase in the denitrification process in the soil profile. There was no significant relationship between the concentration of dissolved N_2O and the NO_3 concentration. The CO_2 concentration ranged from 15.5 to 30.7 μg CO_2-C L^<-1> and was higher in the snow season (November-March). Relatively higher indirect emissions of all the gases (dissolved concentration x flow rate of the subsurface-drainage) were observed in the snowmelt season (April) and after heavy rain. The annual indirect emissions through the subsurface-drainage were calculated to be 0.747 kg N_2O-N ha^<-1>, 0.115 kg CH_4-C ha^<-1>, 132 kg CO_2-C ha^<-1>, which corresponded to 4.6, 58, and 2.5% of direct emissions, respectively.
- 社団法人日本土壌肥料学会の論文
著者
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Hatano Ryusuke
Graduate School of Agriculture, Hokkaido University
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KUSA Kanako
National Agricultural Research Center
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Sawamoto Takuji
Graduate School of Agriculture, Hokkaido University
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Kusa Kanako
Laboratory Of Soil Science Graduate School Of Agriculture Hokkaido University:(present Office)nation
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Sawamoto Takuji
Laboratory Of Soil Science Graduate School Of Agriculture Hokkaido University:(present Office)facult
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Sawamoto Takuji
Rakuno Gakuen Univ. Hokkaido Jpn
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KUSA Kanako
Graduate School of Agriculture, Hokkaido University
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HU Ronggui
Graduate School of Agriculture, Hokkaido University
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Hu Ronggui
Graduate School Of Agriculture Hokkaido University
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Hatano Ryusuke
Graduate School Of Agriculture Hokkaido Univ.
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