Time-course changes in tree hydraulics under the soil desiccation processes in dry dwarf forest in Bonin islands.

• Project/Area Number: 26870833
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Ecology/Environment; Forest science
• Research Institution: Kyoto University (2016); Forestry and Forest Products Research Institute (2014-2015)
• Principal Investigator: Yoshimura Kenichi 京都大学, 農学研究科, 研究員 (20640717)
• Research Collaborator: ISHIDA Atsushi ; Saiki Shintaro ; YAZAKI Kenichi ; NAKANO Takashi
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: エンボリズム / 非構造性炭素 / 乾燥耐性 / 水利用 / 通水回復 / 柔細胞 / 野外乾燥 / 小笠原 / キャビテーション / 可溶性糖 / 通水性 / 乾性低木林 / 水分生理 / 野外灌水実験 / 通水性回復 / 糖

Outline of Final Research Achievements

We explored tree hydraulics and the mechanism how trees survive under the severe soil desiccation processes in dry dwarf forest in Bonin islands. Xylem embolism proceeded under the soil-drying processes, and simultaneously starch contents in xylem decreased and soluble-sugar contents increased. Such dynamics in non-structural carbohydrates enables recovery in xylem hydraulic conductance after the rainfall events. We also found that stem and branch respiration rates decreased under the soil drying process. We concluded that carbon use process such as respiration and the dynamics in non-structural carbohydrates are important for survival under the drought.

Research Products

• [Journal Article] Physiological mechanisms of drought-induced tree die-off in relation to carbon, hydraulic and respiratory stress in a drought-tolerant woody plant (2017)
  • Author(s): SAIKI, S, ISHIDA, A, YOSHIMURA, K, YAZAKI, K
  • Journal Title: Scientific Reports Volume: 印刷中
  • NAID: 120006309303
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] The dynamics of carbon stored in xylem sapwood to drought-induced hydraulic stress in mature trees (2016)
  • Author(s): Kenichi Yoshimura, Shintaro Saiki, Kenichi Yazaki, Mayumi Y. Ogasa, Makoto Shirai, Takashi Nakano, Jin Yoshimura, Atsushi Ishida
  • Journal Title: Scientific Reports Volume: 6 Issue: 1 Pages: 24513-24513
  • DOI: 10.1038/srep24513
  • NAID: 120005745660
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] 父島低木林における強度乾燥経験後の樹木生理活性回復過程と衰退過程の分岐点 (2017)
  • Author(s): 吉村謙一・才木真太朗・木村芙久・甲野裕理・矢崎健一・丸山 温・石田 厚
  • Organizer: 日本森林学会
  • Place of Presentation: 鹿児島大学
  • Year and Date: 2017-03-27
• [Presentation] 小笠原乾性低木林樹木の夏の乾燥と野外潅水パルスに対する生理応答 (2015)
  • Author(s): 吉村謙一、才木真太朗、白井誠、乙成こずえ、矢崎健一、中野隆志、石田厚
  • Organizer: 日本森林学会
  • Place of Presentation: 北海道大学
  • Year and Date: 2015-03-28