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N2O emissions during the freezing and thawing periods from six fields in a livestock farm, southern Hokkaido, Japan

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Title: N2O emissions during the freezing and thawing periods from six fields in a livestock farm, southern Hokkaido, Japan
Authors: Katayanagi, Nobuko Browse this author
Hatano, Ryusuke Browse this author →KAKEN DB
Keywords: corn field
denitrification activity
freezing and thawing periods
grassland
nitrous oxide
Issue Date: Apr-2012
Publisher: Taylor & Francis
Journal Title: Soil Science and Plant Nutrition
Volume: 58
Issue: 2
Start Page: 261
End Page: 271
Publisher DOI: 10.1080/00380768.2012.670810
Abstract: In many countries, high nitrous oxide (N2O) emissions have been observed during soil freezing and thawing periods. Quantification of those emissions is crucial to evaluate annual N2O emissions. For this study, we measured N2O and NO fluxes along with soil N2O concentrations at a corn field and five grasslands during a winter-spring period in Southern Hokkaido, Japan. We also measured denitrification activities of the soils from those sites. During the observation period, the soils froze to a maximum depth of 370 mm under saturated conditions and the lowest soil temperature at a 50 mm depth was -4.5℃. After 6 March 2005, daily air temperature rose above 0℃, but the soil temperature remained approximately 0℃ for about two weeks. These two weeks were defined as the 'transition period,' while the periods before and after the transition period were defined as the 'freezing' and the 'thawing' periods, respectively. During the freezing and transition periods, N2O concentration increased in the frozen soils relative to the unfrozen soils and the highest values were observed in the frozen soils during the transition period. During the thawing period, the N2O concentration in the soils decreased. N2O emissions were much higher during the thawing period than during the freezing and transition periods, and remarkably higher N2O emissions were observed at the corn site compared to those at the grassland sites. NO emissions were also observed during the thawing period but at much lower levels than N2O emissions at all the sites. N2O-N/NO-N ratio exceeded one at all the sites during the entire period, indicating N2O production through denitrification. At the corn site, denitrification activity was much lower and N2O/(N2O+N2) was much higher than at the grasslands. The result indicated that high N2O emissions at the corn site were caused by complementary processes: (1) high accumulated N2O through denitrification in the frozen soil during the freezing and transition periods, and (2) low N2O reduction rate during the thawing period.
Rights: This is an electronic version of an article published in Soil Science and Plant Nutrition 58(2), 261-271, 2012. Soil Science and Plant Nutrition is available online at: http://www.informaworld.com/openurl?genre=article&issn=0038-0768&volume=58&issue=2&spage=261
Relation: http://www.informaworld.com/openurl?genre=article&issn=0038-0768&volume=58&issue=2&spage=261
Type: article (author version)
URI: http://hdl.handle.net/2115/52660
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 波多野 隆介

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