Underground competition of Picea mariana in central Alaska: an analysis focused on the root gaps

• Project/Area Number: 15K14752
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Forest science
• Research Institution: Shinshu University
• Principal Investigator: SHIROTA Tetsuoh 信州大学, 学術研究院農学系, 助教 (10374711)
• Co-Investigator(Kenkyū-buntansha): 安江 恒 信州大学, 学術研究院農学系, 准教授 (00324236)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2017: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000); Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 個体間競争 / 根系 / クロトウヒ / 周極域 / 永久凍土域

Outline of Final Research Achievements

Picea mariana trees on the upland of interior Alaska were competitive below the ground, not above ground. This hypothesis was supported by three evidences. At first, roots occupied 98% of ground surface, whereas their canopy covered only 21%. Second, root system of each individual represent asymmetric shape. And third, local root length density of focused individual was negatively affected by one of competing individuals. These results suggest that P.mariana allocate much of the productions to their root system.

Research Products

• [Int'l Joint Research] アラスカ大学フェアバンクス校(米国)
• [Journal Article] イチイシュートの二列互生はいつ形成されるのか？ (2016)
  • Author(s): 岩崎千鶴，飯島健史，西野美樹，城田徹央，岡野哲郎
  • Journal Title: 信州大学環境科学年報 Volume: 38 Pages: 43-48
  • NAID: 130005166948
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] The annual change of defoliation intensity by Lymantria disper and its size dependency of Larix sibirica in Mongolia (2018)
  • Author(s): S.Okaniwa, T.Shirota, K.Inoue, Y.Fujioka, T.Tanabe, K.Yasue, T.Okano, N. Baatarbileg, B. Oyunsanaa
  • Organizer: ISAR-5 / Fifth International Symposium on Arctic Research
  • Int'l Joint Research
• [Presentation] Underground competition may be occurred among Picea mariana trees in central Alaska (2018)
  • Author(s): T.Shirota, K.Yasue, S.Otake, T.Saito, T.Tanabe, M.Dannnoura, Y.Matsuura, K.Noguchi, T.Morishita, R.Ruess, J.Hollingsworth
  • Organizer: ISAR-5 / Fifth International Symposium on Arctic Research
  • Int'l Joint Research
• [Presentation] アラスカ内陸部におけるクロトウヒ根系の水平分布 (2017)
  • Author(s): 城田徹央・安江恒・檀浦正子・大嶽聡子
  • Organizer: 日本森林学会
  • Place of Presentation: 鹿児島大学（鹿児島県鹿児島市）
  • Year and Date: 2017-03-27
• [Presentation] アラスカ内陸部に成育するクロトウヒ一次枝伸張量の気候応答 (2017)
  • Author(s): 田邊智子・城田徹央・兼松真里衣・安江恒・野口亨太郎・岡野哲郎
  • Organizer: 日本森林学会
  • Place of Presentation: 鹿児島大学（鹿児島県鹿児島市）
  • Year and Date: 2017-03-27
• [Presentation] アラスカ内陸部に生育するぷラックスプルースの根の肥大成長と側根発生の経時変化 (2017)
  • Author(s): 大嶽聡子・森下智陽・松浦陽次郎・野口享太郎・城田徹央・安江恒
  • Organizer: 日本木材学会
  • Place of Presentation: アクロス福岡（福岡県福岡市）
  • Year and Date: 2017-03-18
• [Presentation] イチイシュートの二列互生はいつ形成されるのか？ (2016)
  • Author(s): 岩崎千鶴，飯島健史，西野美樹，城田徹央，岡野哲郎
  • Organizer: 日本森林学会
  • Place of Presentation: 日本大学生物資源科学部
  • Year and Date: 2016-03-28