Soil nitrogen dynamics following a slash-and-burn treatment in a secondary forest of western Japan

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  • SU J.
    The United Grad. Sch. of Agric. Sci., Tottori Univ.
  • KATAGIRI S.
    Fac. of Life and Environ. Sci., Shimane Univ.
  • KANEKO N.
    Fac. of Life and Environ. Sci., Shimane Univ.
  • NAGAYAMA Y.
    Fac. of Life and Environ. Sci., Shimane Univ.

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Other Title
  • 焼畑にともなう火入れが土壌の窒素動態に与える影響
  • 焼畑にともなう火入れが土壌の窒素動態に与える影響--斜面地形との関係
  • ヤキハタ ニ トモナウ ヒイレ ガ ドジョウ ノ チッソ ドウタイ ニ アタエ
  • 斜面地形との関係
  • In relation to topography

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The effects of a slash-and-burn treatment on soil nitrogen in a secondary forest were measured at Nita-cho, Shimane Prefecture, Japan. After burning, the amount of NH4-N, only in the soil surface layer (05 cm) increased significantly, and the soil NOx-N in all layers within the upper and lower parts of the bottom, and the lower part of the ridge of the slope were increased significantly. After burning of the forest floor, there were few possibilities, in terms of erosion of nitrogen, on the ridge, but it was considered to be possible for the nitrogen to leach out in the lower part of the bottom. The microbial biomass-N decreased significantly in the surface layer due to the burning. Therefore, the decreases of nitrogen mineralization rates after burning suggest that the fire first decreased the microbial biomass-N and then intensified the process of immobilization of the soil nitrogen. By means of microbial immobilization after burning, it is reasonable to buffer the effects of fire on soil nitrogen. It also was found that fire behavior is very important in affecting soil nitrogen.

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