Comparison of soil microbial biomass and activity among site positions on a slope planted with Japanese cypress and cedar forests

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  • Ichikawa Takahiro
    Graduate School of Science and Technology, Chiba University:(Present Office)Shioya Agricultural Development Office, Tochigi Prefecture
  • Okabe Norihiro
    Faculty of Horticulture, Chiba University:Graduate School of Science and Technology, Niigata University
  • Takahashi Terumasa
    Faculty of Horticulture, Chiba University
  • Asano Yoshito
    Graduate School of Science and Technology, Chiba University

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  • 同一斜面に隣接するヒノキ・スギ人工林における土壌中の微生物の量および活性の比較
  • ドウイツ シャメン ニ リンセツ スル ヒノキ スギ ジンコウリン ニ オケル ドジョウ チュウ ノ ビセイブツ ノ リョウ オヨビ カッセイ ノ ヒカク

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Abstract

The purpose of this study was to establish the effects of tree species on microbial biomass and activity in top soil of each slope position (upper, middle, lower). Study sites were planted with Japanese cypress in parallel with Japanese cedar along a slope from ridge to stream. The numbers of fungi and actinomycetes, and the amount of microbial biomass carbon and microbial activity in the soil, at a depth of 0-10cm, in the cypress plantations were 1.1-3.9 times greater than in the cedar plantations, regardless of slope position. The quantity of bacteria in the soil on the lower slope was 2.6 times greater in the cypress plantation than in the cedar plantation. The residence time of litter (standing stock of litter / annual litterfall) correlated negatively with the quantity of bacteria in the top soil, and it was particularly low in the cypress plantation on the lower slope. On the lower slope, it was thought that decomposition of litter was faster among the cypresses than among the cedars due to the fungi and bacteria.

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