Nitrogen acquisition strategy of boreal forest plants: Winter nitrogen assimilation and its energy source

• Project/Area Number: 25712017
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Forest science
• Research Institution: Kyoto University
• Principal Investigator: Koyama Lina 京都大学, 情報学研究科, 准教授 (50378832)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥25,350,000 (Direct Cost: ¥19,500,000、Indirect Cost: ¥5,850,000); Fiscal Year 2016: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2015: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2014: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2013: ¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
• Keywords: 北方林 / 植物栄養代謝 / 冬季 / 窒素同化 / 光合成

Outline of Final Research Achievements

Nitrate use and photosynthesis of boreal tree species were investigated throughout winter to demonstrate that boreal tree species can acquire N in winter to meet the N demand. Field investigations on black spruce (Picea mariana) in interior Alaska, USA showed that black spruce was able to assimilate nitrate throughout the winter, while the capacity of photosynthesis declined with decreasing temperature in early to mid-winter, but did not increase when the temperature recovered in the late winter. Sakhalin spruce (Picea glehnii) grown in a low temperature incubator showed the same trend. Photosynthetic capacity of Sakhalin spruce declined with decreasing temperature, but did not increased with the temperature rise simulating late winter.

Research Products

• [Int'l Joint Research] University of Alaska Fairbanks(米国)
• [Int'l Joint Research] University of Alaska Fairbanks(米国)
• [Journal Article] Winter climate change in plant-soil systems : summary of recent findings and future perspectives (2014)
  • Author(s): Makoto, K., Kajimoto, T., Koyama, L., Kudo, G., Shibata, H., Yanai, Y., Cornelissen, J. H. C.
  • Journal Title: Ecological Research Volume: (印刷中) Issue: 4 Pages: 593-606
  • DOI: 10.1007/s11284-013-1115-0
  • Peer Reviewed
• [Presentation] Nitrate Use by Black Spruce in Winter in Boreal Forests (2017)
  • Author(s): Lina A. Koyama, Knut Kielland
  • Organizer: 日本生態学会第64回大会
  • Place of Presentation: 早稲田大学早稲田キャンパス（東京都新宿区）
  • Year and Date: 2017-03-16
• [Presentation] 低温環境下におけるアカエゾマツの光合成能力に温度変化が及ぼす影響 (2016)
  • Author(s): 藤野 匠、小山里奈
  • Organizer: 日本生態学会第63回大会
  • Place of Presentation: 仙台国際センター（宮城県仙台市）
  • Year and Date: 2016-03-24
• [Presentation] Wintertime photosynthetic capacity of black spruce (Picea mariana) in boreal forests in interior Alaska (2015)
  • Author(s): Takumi Fujino, Lina A. Koyama, Knut Kielland
  • Organizer: 2015 AGU Fall Meeting
  • Place of Presentation: The Moscone Center (San Francisco, CA, USA)
  • Year and Date: 2015-12-17
  • Int'l Joint Research