@article{oai:rakuno.repo.nii.ac.jp:00000354,
 author = {KUSA, Kanako and SAWAMOTO, Takuji and 澤本, 卓治 and HU, Ronggui and HATANO, Ryusuke},
 issue = {1},
 journal = {Soil Science & Plant Nutrition},
 month = {},
 note = {Article, We measured nitrous oxide (N_2O) and carbon dioxide (CO_2) fluxes from the soil surface and in the soil through to a depth of 0.3 m, and their concentration profiles through to a depth of 0.6 m in both a Gray Lowland soil with macropores and cracks and an Andosol with undeveloped soil structure in central Hokkaido, Japan. The objective of the present study was to elucidate any differences in N_2O production and flux in the soil profile between these two soil types. In the Gray Lowland soil, the N_2O concentration above 0.4 m increased with an increase in soil depth. In the Andosol, there were no distinctive N_2O concentration gradients in the topsoil when the N_2O flux did not increase. However, the N_2O concentration at a depth of 0.1 m significantly increased and this concentration was higher than the concentration below 0.2 m when the N_2O flux greatly increased. Thus, the N_2O concentration profiles were different between these two soils. The contribution ratios of the N_2O produced in the top soil (0-0.3 m depth) to the total N_2O emitted from the soil to the atmosphere in the Gray Lowland soil and the Andosol were 0.86 and 1.00, respectively, indicating that the N_2O emitted from the soil to the atmosphere was mainly produced in the top soil. However, the contribution ratio of the subsoil to the N_2O emitted from the Gray Lowland soil was higher than that of the Andosol. There was a significant positive correlation between the N_2O flux through to a 0.3 m depth and the flux from the soil to the atmosphere in the Gray Lowland soil only. These results suggest that N_2O production in the subsoil of the Gray Lowland soil could have been activated by NO_3^− leaching through macropores and cracks, and subsequently the N_2O produced in the subsoil could have been rapidly emitted to the atmosphere through the macropores and cracks.},
 pages = {186--199},
 title = {Comparison of N_2O and CO_2 concentrations and fluxes in the soil profile between a Gray Lowland soil and an Andosol},
 volume = {56},
 year = {2010}
}