The effect of cultivation on changes in soil carbon stocks in the Andosols of Tokachi district, Hokkaido

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  • NIWA Katsuhisa
    Zukosha Co., Ltd
  • NAGATA Osamu
    NARO Hokkaido Agricultural Research Center:(Present office)Agriculture, Forestry and Fisheries Research Council, Ministry of Agriculture, Forestry and Fisheries
  • WAKABAYASHI Katsufumi
    NARO Hokkaido Agricultural Research Center
  • HONGO Chiharu
    Center for Environmental Remote Sensing, Chiba University

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Other Title
  • 北海道十勝地域における黒ボク土地帯の耕地化による土壌炭素変化の要因解析
  • ホッカイドウ トカチ チイキ ニ オケル クロ ボク ドチタイ ノ コウチカ ニ ヨル ドジョウ タンソ ヘンカ ノ ヨウイン カイセキ

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The changes in soil C stocks caused by cultivation were estimated by comparing C stocks in the A horizons of cultivated fields with those in un-cultivated fields. These fields were in Andosol areas of Tokachi district, Hokkaido. The results were as follows: (1) Three patterns of change in soil C stocks were observed with cultivation: Group 1: increased soil C stocks, seen in Low-humic Andosols; Group 2: no change, seen in High-humic Haplic Andosols; and Group 3: decreased soil C stocks, seen in High-humic Haplic Andosols, High-humic Haplic Wet Andosols, and High-humic Cumulic Wet Andosols. (2) With cultivation, soil C stocks in Group 1 increased by 21.9 to 31.8 Mg C ha^<-1>, whereas those in Group 3 decreased by 78.5 to 149.8 Mg C ha^<-1>. The soil C stocks in the un-cultivated fields in Group 3 were highest among the three groups (more than 250 Mg C ha^<-1>) due to poor drainage; however, pipe drainage improved drainage and decreased soil C stocks in cultivated fields.

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