Enhanced emission of nitrous oxide (N2O) from a nitrogen-saturated watershed

• KAWAKAMI Tomonori

  Department of Environmental Systems Engineering, Toyama Prefectural University

Bibliographic Information

Other Title

• 森林土壌の窒素飽和化による亜酸化窒素発生フラックスの増加

Abstract

Many streams of Kureha Hill, Toyama, Japan, are believed to suffer from nitrogen saturation because of their extremely high concentration of nitrate. The enhanced nitrification by nitrogen saturation would accelerate an emission of N₂O to the atmosphere. We measured the N₂O flux to the atmosphere both from a nitrogen-saturated forest floor and from a non-nitrogen-saturated forest floor in order to determine the effect of nitrogen saturation on the emission of N₂O.<BR>As a representative of a nitrogen-saturated stream, Hyakumakidani was selected because it contains a high concentration of nitrate as 164μmol/l. Sannokuma Stream on Imizu Hill, adjacent to Kureha Hill, was selected as a non-nitrogen-saturated stream because it contains no more than 9μmol/l of nitrate. Both forested watersheds are covered mainly by hardwood. Their vegetation, soil types, and nitrogen deposition are similar.<BR>The average N₂O flux from the nitrogen-saturated watershed, Hyakumakidani, was 2.42μg-N/m²/h from October 2004 to May 2005, while it was only 0.21μg-N/m²/h from the non-nitrogen-saturated watershed.This result clearly shows that nitrogen saturation could accelerate N₂O emission to the atmosphere.

Journal

• ENVIRONMENTAL ENGINEERING RESEARCH

  ENVIRONMENTAL ENGINEERING RESEARCH 42 163-170, 2005

  Japan Society of Civil Engineers

Keywords

• nitrogen saturation
• greenhouse gas
• N<SUB>2</SUB>O flux
• nitrate
• forested watershed

Details

• CRID: 1390001204111426560
• NII Article ID: 130003949441
• DOI: 10.11532/proes1992.42.163
• ISSN: 1884829X
• ISSN: 13415115
• Text Lang: ja
• Data Source:
  • JaLC
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed