Mechanism of carbon accumulation in soil on a millennial time scale using Quaternary, buried volcanic ash soils

• Project/Area Number: 25870653
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Environmental dynamic analysis; Forest science
• Research Institution: Rakuno Gakuen University
• Principal Investigator: HOBARA Satoru 酪農学園大学, 農食環境学群, 准教授 (70391159)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 埋没土壌 / 古土壌 / 火山灰 / アミノ酸 / 炭素隔離 / 炭素蓄積 / 土壌有機物

Outline of Final Research Achievements

In this study, I took soils including paleosols of the Quaternary period, buried deep in soil, and conducted biochemical analyses including hydrolyzable amino acid composition. The results showed that older soils contain more amino acids derived from microorganisms and amino acid composition changed to a direction. Additionally, the results in the soil incubation experiment with organic carbon addition indicated that accumulation of amino acids and carbon are closely associated with adsorption properties of soil. These observations newly demonstrate that (1) microorganisms significantly contribute to soil organic matter on a millennial time scale, (2) there is selectivity in compounds that can remain in deep soil on long time scales, and (3) the quantity of the remaining organic matter is strongly controlled by soil geochemical characteristics of organic matter adsorption.

Research Products

• [Journal Article] Relationships among pH, minerals, and carbon in soils from tundra to boreal forest across (2016)
  • Author(s): Hobara, S., Kushida, K., Kim, Y.W., Koba, K., Lee, B.Y., Ae, N.
  • Journal Title: Ecosystems Volume: 19
  • Peer Reviewed
• [Journal Article] 34,000年間における大気からの水銀降下量の変化 (2015)
  • Author(s): 水野直治、保原 達、天野洋司
  • Journal Title: 農業および園芸 Volume: 90 Pages: 25-31
  • NAID: 120006311874
• [Presentation] 土壌の有機物吸着性は土壌炭素蓄積量に違いをもたらすか？ (2016)
  • Author(s): 河上智也・小林高嶺・保原 達・松本真悟・春日純子・阿江教治
  • Organizer: 日本森林学会
  • Place of Presentation: 日本大学生物資源学部
  • Year and Date: 2016-03-28
• [Presentation] 森林生態系における埋没腐植土の地化学的・微生物学的特性 (2016)
  • Author(s): 金子 命・末次亮太・磯部一夫・保原 達
  • Organizer: 日本生態学会
  • Place of Presentation: 仙台国際センター
  • Year and Date: 2016-03-21
• [Presentation] Global cycle of mercury estimated from historical tephra soil layers (2015)
  • Author(s): Satoru Hobara, Yoji Amano, Naoharu Mizuno
  • Organizer: International Conference on Biogeochemistry of Trace Elements（ICOBTE 2015）
  • Place of Presentation: 横浜国際会議場
  • Year and Date: 2015-07-13
  • Int'l Joint Research
• [Presentation] Effects of microorganisms and minerals on size distribution of organic matter adsorbed to soil (2015)
  • Author(s): Satoru Hobara, Yuki Hasegawa, Kyohei Fujita, Takayuki Satou, Akio Imai, Hiroshi Ogawa, Hideaki Ito, Noriharu Ae
  • Organizer: 日本地球惑星連合JPGU 2015年大会
  • Place of Presentation: 幕張メッセ
  • Year and Date: 2015-05-26
• [Presentation] 様々な環境条件下の分解過程で生成される微生物由来有機物にみられる生化学的共通性 (2014)
  • Author(s): 保原 達
  • Organizer: 日本地球惑星科学連合 連合大会 2014年大会
  • Place of Presentation: パシフィコ横浜
  • Year and Date: 2014-04-28 – 2014-05-02