Effects of thinning on development of understory vegetation and nitrogen utilization of hinoki cypress trees

• Project/Area Number: 25450224
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Forest science
• Research Institution: Forestry and Forest Products Research Institute
• Principal Investigator: Inagaki Yoshiyuki 国立研究開発法人森林総合研究所, 四国支所, 主任研究員 (00353590)
• Co-Investigator(Kenkyū-buntansha): 木庭 啓介 京都大学, 生態学研究センター, 教授 (90311745)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: ヒノキ / 下層植生 / 間伐 / 窒素 / 競争 / 安定同位体比 / 窒素安定同位体

Outline of Final Research Achievements

Thinning in hinoki cypress plantations can develop understory vegetation. Understory vegetation is expected to promote nitrogen cycling of forest ecosystems and enhance nitrogen uptake of hinoki cypress trees. Nitrogen content in leaves of hinoki cypress trees thinned 10 years ago remained lower than that in the unthinned control. Increase of nitrogen uptake by hinoki cypress is not large due to limited increase of leaf biomass.
Nitrogen isotope ratio in leaves was used as an indicator of soil nitrogen sources. Hinoki cypress and understory vegetation utilize similar nitrogen sources in thinned plots while they utilize different sources in the unthinned control. The competition for nitrogen sources between hinoki cypress and understory vegetation was reduced by thinning

Research Products

• [Journal Article] 高知県のヒノキ人工林における豊作年の雄花・球果生産 (2016)
  • Author(s): 稲垣善之・倉本惠生・深田英久
  • Journal Title: 森林応用研究 Volume: 25 Pages: 5-11
  • NAID: 130008062813
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Stable nitrogen and carbon isotope ratios and related leaf traits of four tree species at high and low nitrogen-deposition sites in the Kanto district of Japan (2015)
  • Author(s): Inagaki Y, Inagaki M, Hashimoto T, Kaneko S
  • Journal Title: Bulletin of Forestry and Forest Products Research Institute 14 Volume: 14 Pages: 201-208
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] 間伐がスギ人工林におけるリターフォール供給と土壌の炭素窒素蓄積量に及ぼす影響 (2014)
  • Author(s): 稲垣善之・篠宮佳樹・野口享太郎・平井敬三・金子真司
  • Journal Title: 関東森林研究 Volume: 65 Pages: 115-118
  • Peer Reviewed
• [Presentation] 地形の異なるヒノキ林における樹冠葉量の推定 (2017)
  • Author(s): 稲垣善之・宮本和樹・奥田史郎・野口麻穂子・伊藤武治
  • Organizer: 日本生態学会大会
  • Place of Presentation: 早稲田大学（東京都新宿区）
  • Year and Date: 2017-03-16
• [Presentation] Effects of thinning on leaf carbon isotope composition and stem growth in hinoki cypress plantation forests in Japan (2016)
  • Author(s): Yoshiyuki Inagaki, Hidehisa Fukata
  • Organizer: The 10th international conference on the applications of stable isotopes to ecological studies
  • Place of Presentation: 東京大学（東京都文京区）
  • Year and Date: 2016-04-05
  • Int'l Joint Research
• [Presentation] 間伐がヒノキ葉の窒素濃度および炭素・窒素安定同位体比に及ぼす影響 (2015)
  • Author(s): 稲垣善之、野口享太郎、宮本和樹、奥田史郎、野口麻穂子、伊藤武治
  • Organizer: 地球惑星科学連合大会2015年大会、MIS26-27
  • Place of Presentation: 幕張国際会議場
  • Year and Date: 2015-05-28
• [Presentation] 下層植生が針葉樹人工林の窒素循環に及ぼす影響 (2015)
  • Author(s): 稲垣善之、野口享太郎、三浦覚、中西麻美、舘野隆之輔、福島慶太郎、大浦典子、市川貴大、戸田浩人
  • Organizer: 第126回日本森林学会大会
  • Place of Presentation: 北海道大学
  • Year and Date: 2015-03-28
• [Presentation] Effects of thinning on nitrogen utilization of hinoki cypress and understory vegetation in Shikoku Island、southern Japan (2014)
  • Author(s): Yoshiyuki Inagaki, Kyotaro Noguchi, Hidehisa Fukata
  • Organizer: 20th World Congress of Soil Science
  • Place of Presentation: ICC Jeju, Korea
  • Year and Date: 2014-06-09
• [Presentation] Nitrogen stable isotopic composition of leaves and soil in Japanese cedar and hinoki cypress plantation along a precipitation gradient in Shikoku district, southern Japan (2013)
  • Author(s): Inagaki Y, Fukata H, Koba K
  • Organizer: International Symposium on Forest Soils
  • Place of Presentation: Shengyang, China
• [Remarks] Ｒｅｓｅａｒｃｈｍａｐ
  • URL: http://researchmap.jp/hinokilitter
• [Remarks] researchmap
  • URL: http://researchmap.jp/hinokilitter