小麦残渣および肥料が施与された慣行耕起・省耕起・不耕起栽培体系における亜酸化窒素の発生

• 永田 修

  北海道農業研究センター

• 杉戸 智子

  北海道農業研究センター

• 小林 創平

  北海道農業研究センター

• 鮫島 良次

  北海道農業研究センター

書誌事項

タイトル別名

• Nitrous oxide emissions following the application of wheat residues and fertilizer under conventional-, reduced-, and zero-tillage systems in central Hokkaido, Japan

抄録

Nitrous oxide (N₂O) is a major greenhouse gas produced by agricultural systems, and has a higher greenhouse effect than carbon dioxide (CO₂) and methane (CH₄). Cultivation techniques (particularly tillage) and the incorporation of crop residues contribute to N₂O release. Our objective was to quantify the rates of N₂O emissions from conventional-, reduced-, and zero-tillage systems (CT, RT, and ZT, respectively) with the application of wheat residues and fertilizer. The study included CT, RT, and ZT systems, and a no-fertilizer (NF) treatment without basal and top dressing (CT/NF). N₂O flux in each treatment reached the highest value between mid- and late October (for ZT, RT, CT, and CT/NF, 1763, 2640, 1458, and 1620 µg N m^-2 hr^-1, respectively). Immediately after snowmelt, large increases in N₂O emissions were observed in the ZT, RT, and CT plots, with maximum values of 413, 959, and 439 µg N m^-2 hr^-1, respectively. This trend was not apparent in the CT/NF plots, suggesting that basal dressing with nitrogen is responsible for large emissions after snowmelt. No remarkable N₂O emission occurred from snowmelt until harvest, indicating that nitrogen application by top dressing is not an important N₂O source. Total N₂O emissions from the ZT, RT, CT, and CT/NF plots during the sampling period (296 days) were 8.9, 11.1, 9.5, and 8.8 kg N ha^-1, respectively, and did not differ significantly. Our results suggest that incorporation of wheat straw residues, including surface mulching in the ZT plot, was an important factor that affected large N₂O emission. N₂O emission before and behind of snowmelt (27 days) accounted for 11% to 18% of total N₂O emission during the sampling period. Our results also suggest that full-year investigations are necessary to prevent underestimation of N₂O emission due to snowmelt.

収録刊行物

• 農業気象

  農業気象 65 (2), 151-159, 2009

  日本農業気象学会

キーワード

• 亜酸化窒素
• 耕起体系
• 小麦残渣
• 二酸化炭素
• 融雪

詳細情報

• CRID: 1390282679644713600
• NII論文ID: 10025614237
• NII書誌ID: AA11530034
• DOI: 10.2480/agrmet.65.2.3
• ISSN: 18810136
• ISSN: 00218588
• NDL書誌ID: 10366669
• Web Site: https://agriknowledge.affrc.go.jp/RN/2030780228
• Web Site: http://id.ndl.go.jp/bib/10366669
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10366669
• Web Site: http://www.jstage.jst.go.jp/article/agrmet/65/2/65_65.2.3/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • IRDB
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可