Short-term effects of grassland renovation on CO₂ exchange of grasslands in a temperate humid region

• MATSUURA Shoji

  Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization

• NAKAO Seiji

  Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization

• HOJITO Masayuki

  Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization School of Veterinary Medicine, Field Science Center, Kitasato University

書誌事項

タイトル別名

• Short-term effects of grassland renovation on CO<SUB>2</SUB> exchange of grasslands in a temperate humid region

抄録

To investigate the short-term effects of grassland renovation on carbon dioxide (CO₂) exchange of intensively managed grasslands in Japan, we conducted CO₂ flux measurements during the renovation process by using the eddy covariance and closed chamber methods in 2007, 2012, and 2013. The flux measurements were conducted at three grassland fields: two fields used for cutting, one receiving only chemical fertilizer (CF) and the other receiving composted cattle manure (CM) annually, and one field used for grazing (GM). Chamber measurements revealed flushes of CO₂ after plowing (14.45-23.94 μmol m^-2 s^-1) and subsequent disk harrowing (7.36 μmol m^-2 s^-1, in CF) followed by rapid drops of CO₂ flux, which were local and temporary phenomena. The mean CO₂ losses during renovation periods were calculated as 4.52-4.74, 6.00-6.81, and 4.57 g C m^-2 d^-1 in CF, CM, and GM, respectively; CF and CM calculation is based on eddy covariance measurements, including temporal flux variations and representing footprint areas. The amount of carbon input during renovation including non-harvested grass biomass (stubble and roots) and applied manure was estimated as 2.24-3.50 and 6.17-8.77 Mg C ha^-1 in CF and CM, respectively. Among them, carbon derived from plowed roots and manure is presumably resistant in soil, contributing to long-term soil organic carbon (SOC) accumulation. Our results also indicate that grassland renovation work does not affect short-term net CO₂ loss significantly, although it affects CO₂ emissions to a certain extent. We can therefore say that net CO₂ loss during renovation is mainly brought by the absence of vegetation in this site. Grasses contribute SOC accumulation through biomass allocation belowground; and it is thus recommended to shorten grassland renovation period, the duration without photosynthesis, to reduce CO₂ loss associated with grassland renovation.

収録刊行物

• 農業気象

  農業気象 73 (4), 174-186, 2017

  日本農業気象学会

キーワード

• Carbon dioxide
• Closed static chamber
• Eddy covariance
• Grassland renovation
• Soil organic carbon

詳細情報

• CRID: 1390282679647139840
• NII論文ID: 130006163808
• NII書誌ID: AN00200732
• DOI: 10.2480/agrmet.d-16-00019
• ISSN: 18810136
• ISSN: 00218588
• NDL書誌ID: 028567280
• Web Site: http://id.ndl.go.jp/bib/028567280
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I028567280
• Web Site: https://www.jstage.jst.go.jp/article/agrmet/73/4/73_D-16-00019/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可