Six-year change of heterotrophic respiration rate in a clear-cutting site of <i>Cryptomeria japonica</i> plantation

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  • Abe Yukiko
    Graduate School of Agricultural and Life Sciencies, The University of Tokyo
  • Hashimoto Shoji
    Graduate School of Agricultural and Life Sciencies, The University of Tokyo Forestry and Forest Products Research Institute
  • Kurokochi Hiroyuki
    Graduate School of Agricultural and Life Sciencies, The University of Tokyo
  • Teramoto Munemasa
    Center for Global Environmental Research, National Institute for Environmental Studies
  • Sugawara Izumi
    Faculty of Regional Environment Science, Tokyo University of Agriculture
  • Liang Naishen
    Center for Global Environmental Research, National Institute for Environmental Studies
  • Tange Takeshi
    Graduate School of Agricultural and Life Sciencies, The University of Tokyo

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Other Title
  • スギ人工林皆伐跡地の微生物呼吸速度の６年間の変化
  • スギ ジンコウリン カイバツアトチ ノ ビセイブツ コキュウ ソクド ノ 6ネンカン ノ ヘンカ

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<p>Knowledge about carbon dynamics on the organic matter pooled in the forest soil was important as basic data to discuss the effect of the progress of global warming. In this study, one treatment area (0.23 ha) and one control area (0.24 ha) were set in a 35-year-old Cryptomeria japonica plantation of Tokyo University of Agriculture Okutama Forest in Okutama-machi, Nishitama-gun, Tokyo, in December 2012, and clear-cutting and ground clearance were done in the treatment area in March 2013. Fixed-point measurements of soil respiration rate (RS) were conducted regularly from January 2013 to December 2018 at 19 and 21 points in the treatment and the control areas, respectively. Volcanic ash soil distributes in the study site. From the comparison of RS estimated at 20℃ （RS20), the ratios of RS20 in the treatment area to the control area were increasing from 0.60 in 2013 to 0.74 (highest) in 2016, but decreased to 0.49 in 2018. The carbon stocks in the surface soil (0-5 cm deep) measured in 2018 were 24.6 t ha-1 at the treatment area and 23.2 t ha-1 at the control area. The total carbon emission for six years was estimated to be 50.3 tC ha-1 in the treatment area, which could not be explained by the decomposition of the organic matter pooled in the surface soil before harvesting. These results support the importance of the carbon pool of subsurface soil for consideration of soil carbon dynamics.</p>

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