Mechanism of decomposition of soil organic matter in relation to different stages of forest degradation in tropical region

• Project/Area Number: 26740011
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Environmental dynamic analysis
• Research Institution: Forest Research and Management Organization
• Principal Investigator: Toriyama Jumpei 国立研究開発法人森林研究・整備機構, 森林総合研究所, 研究員 (00582743)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
• Keywords: 森林劣化 / 熱帯林 / 土壌有機物 / 土壌炭素 / データセット / 土壌炭素動態モデル / カンボジア / 土地利用変化 / キャッサバ

Outline of Final Research Achievements

Based on soil samplings before and after the events of forest degradation in Central Cambodia, we assessed the decomposition rate of soil organic matter and pointed out its controlling factors in this region. We also reviewed the published and unpublished data on soil organic carbon in Cambodia to create a new dataset on soil carbon stock and a technical report for public release. We used this dataset to develop a model for estimating soil carbon stock and the potential amount of decomposition of soil organic carbon after forest degradation in the national level.

Research Products

• [Int'l Joint Research] 森林局/環境省(カンボジア)
• [Int'l Joint Research] カンボジア環境省/カンボジア森林局(カンボジア)
• [Int'l Joint Research] カンボジア森林局(カンボジア)
• [Journal Article] Effects of forest type and environmental factors on the soil organic carbon pool and its density fractions in a seasonally dry tropical forest (2015)
  • Author(s): Jumpei Toriyama, Mao Hak, Akihiro Imaya, Keizo Hirai, Yoshiyuki Kiyono
  • Journal Title: Forest Ecology and Management Volume: 335 Pages: 147-155
  • DOI: 10.1016/j.foreco.2014.09.037
  • Peer Reviewed
• [Presentation] 森林劣化が進む熱帯地域の炭素貯留量推定のための土壌炭素データベース (2018)
  • Author(s): 鳥山淳平
  • Organizer: 第129回日本森林学会大会
• [Presentation] 熱帯季節林の劣化とキャッサバへの転換が土壌炭素蓄積量に与える影響 (2015)
  • Author(s): 鳥山淳平ら
  • Organizer: 日本熱帯生態学会年次大会
  • Place of Presentation: 京都大学（京都市）
  • Year and Date: 2015-06-19