Contribution of subsoil and season for nitrogen mineralization under field condition in forest soil

• Hirai Keizo

  Dep. of Forest Site Environment., For. and Forest Prod. Res. Inst.:(Present office)Tohoku Research Center, Forestry and Forest Products Research Institute

• Noguchi Kyotaro

  Dep. of Forest Site Environment., For. and Forest Prod. Res. Inst.

• Mizoguchi Takeo

  Dep. of Forest Site Environment., For. and Forest Prod. Res. Inst.:(Present office)Kansai Research Center, Forestry and Forest Products Research Institute

• Kaneko Shinji

  Dep. of Forest Site Environment., For. and Forest Prod. Res. Inst.

• Takahashi Masamichi

  Dep. of Forest Site Environment., For. and Forest Prod. Res. Inst.

Bibliographic Information

Other Title

• 森林土壌の現地窒素無機化における下層土および季節別の寄与
• シンリン ドジョウ ノ ゲンチ チッソ ムキカ ニ オケル カソウド オヨビ キセツベツ ノ キヨ

Abstract

We discussed rate of mineralized nitrogen changing through soil profile and their seasonal changes in the soil of small catchments under Sugi (Cryptomeria japonica) and broad leaved forest at North Kanto region. We determined rate of nitrogen mineralization in the soil under field condition using resin core method. Rate of mineralized nitrogen in the soil decreased from lower to upper slope positions. We also cleared that rate of nitrogen mineralization has positive correlation with sum of soil temperature during incubation. An estimated annual amounts of mineralized nitrogen in the soil of a mid slope position was highest among the site, 176.6kgN ha^<-1>yr^<-1>, and those at in a lower slope position was small, 124.6kgN ha^<-1>yr^<-1>. Proportion of mineralized nitrogen in the subsoil, from 20 to 50cm depth, to 0 to 50cm depth is 41% at lower slope, 30% at mid slope and 43% at upper slope position. Amounts of mineralized nitrogen were high in summer. In this duration, 31 to 45% of mineralized nitrogen through a year was mineralized, but 10 to 32% was mineralized in winter. There were possibilities that mineralized nitrogen during winter will leach to the stream water because of fewer uptakes by trees in this season, and be useful for the nutrient source for uptake by trees at the begging of growing season if mineralized nitrogen will remain in the soil until spring also. Therefore, we must study the role of subsoil on nitrogen cycling and dynamics of mineralized nitrogen of winter season in detail.

Journal

• Japanese Journal of Forest Environment

  Japanese Journal of Forest Environment 49 (1), 51-59, 2007

  The Japanese Society of Forest Environment

Details

• CRID: 1390001204212898944
• NII Article ID: 110006976767
• NII Book ID: AN00124077
• DOI: 10.18922/jjfe.49.1_51
• ISSN: 21896275
• ISSN: 03888673
• NDL BIB ID: 8906581
• Web Site: http://id.ndl.go.jp/bib/8906581
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8906581
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed