Impact of expanding oil palm plantations on water and carbon cycling in Southeast Asian tropical forests

• Project/Area Number: 15H02645
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 海外学術
• Research Field: Forest science
• Research Institution: The University of Tokyo (2017-2019); Nagoya University (2015-2016)
• Principal Investigator: Kumagai Tomo'omi 東京大学, 大学院農学生命科学研究科(農学部), 教授 (50304770)
• Co-Investigator(Kenkyū-buntansha): 松本 一穂 琉球大学, 農学部, 准教授 (20528707) ; 檜山 哲哉 名古屋大学, 宇宙地球環境研究所, 教授 (30283451) ; 永井 信 国立研究開発法人海洋研究開発機構, 地球環境観測研究開発センター, 主任研究員 (70452167) ; 小田 智基 東京大学, 大学院農学生命科学研究科(農学部), 助教 (70724855) ; 市榮 智明 高知大学, 教育研究部自然科学系農学部門, 准教授 (80403872) ; 藤波 初木 名古屋大学, 宇宙地球環境研究所, 講師 (60402559)
• Project Period (FY): 2015-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥42,770,000 (Direct Cost: ¥32,900,000、Indirect Cost: ¥9,870,000); Fiscal Year 2018: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000); Fiscal Year 2017: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000); Fiscal Year 2016: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000); Fiscal Year 2015: ¥20,150,000 (Direct Cost: ¥15,500,000、Indirect Cost: ¥4,650,000)
• Keywords: フラックス / 土地利用変化 / 物質循環 / 気候変動

Outline of Final Research Achievements

While land use changes from natural forests to oil palm plantations in tropical forest regions might deteriorate the local environments and biodiversity, there is a lack of qualitative researches on it. In this study, to clarify the effect of the expansion of oil palm plantations on the local environment in Borneo, we conducted observations of water and carbon cycling at individuals to plot scales mainly using eddy-covariance measurement system with a flux-tower. Furthermore, the comparison with water and carbon cycling data in a neighboring natural tropical rainforest allowed us to consider the effect of the land use changes.

Academic Significance and Societal Importance of the Research Achievements

世界のヤシ油需要は常に増加しており、特に東南アジアにおいて、アブラヤシ農園が急速に拡大しており、今後さらに加速すると予測されている。アブラヤシ農園への土地利用変化は、熱帯林破壊の元凶であり、生物多様性や地域環境に及ぼす悪影響が指摘されている。ヤシ油生産国にとってアブラヤシ農園は国全体にとっても地域経済にとっても重要な収入源であり続けている。現在のアブラヤシ農園拡大の速度から考えて、ヤシ油生産と環境保全のバランスを取る合理的な理由を見つけることが喫緊の要事である。本研究の成果は、その合理的理由の大勢を決するものと考える。

Research Products

• [Int'l Joint Research] Malaysian Palm Oil Board(マレーシア)
• [Journal Article] Characteristics of root decomposition based on in-situ experiments in a tropical rainforest in Sarawak, Malaysia: Impacts of root diameter and soil biota (2019)
  • Author(s): Ohashi, M., Makita, N., Katayama, A., Kume, T., Matsumoto, K., Kumagai, T., Endo, I. and Kho, L. K.
  • Journal Title: Plant and Soil Volume: 436 Pages: 439-448
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Gas exchange by the mesic-origin, arid land plantation species Robinia pseudoacacia under annual summer reduction in plant hydraulic conductance (2018)
  • Author(s): Miyazawa, Y., Du, S., Taniguchi, T., Yamanaka, N. and Kumagai, T.
  • Journal Title: Tree Physiology Volume: In press
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Effects of rainfall exclusion on leaf gas exchange traits and osmotic adjustment in mature canopy trees of Dryobalanops aromatica (Dipterocarpaceae) in a Malaysian tropical rain forest (2017)
  • Author(s): Inoue, Y., Ichie, T., Kenzo, T., Yoneyama, A., Kumagai, T. and Nakashizuka, T.
  • Journal Title: Tree Physiology Volume: 37 Pages: 1301-1311
  • Peer Reviewed
• [Journal Article] Impact of tropical deforestation and forest degradation on precipitation over Borneo Island (2017)
  • Author(s): Takahashi, A., Kumagai, T., Kanamori, H., Fujinami, H., Hiyama, T. and Hara, M.
  • Journal Title: Journal of Hydrometeorology Volume: 18 Pages: 2907-2922
  • Peer Reviewed
• [Journal Article] What factors are most influential in governing stemflow production from plantation-grown teak trees? (2017)
  • Author(s): Tanaka, N., Levia, D., Igarashi, Y., Yoshifuji, N., Tanaka, K., Tantasirin, C., Nanko, K., Suzuki, M. and Kumagai, T.
  • Journal Title: Journal of Hydrology Volume: 544 Pages: 10-20
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Persistence and memory timescales in root-zone soil moisture dynamics (2016)
  • Author(s): Ghannam, K., Nakai, T., Paschalis, A., Oishi, A. C., Kotani, A., Igarashi, Y., Kumagai, T., Katul, G.
  • Journal Title: Water Resources Research Volume: 52 Issue: 2 Pages: 1427-1445
  • DOI: 10.1002/2015wr017983
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Evapotranspiration of rubber (Hevea brasiliensis) cultivated at two sites in southeast Asia (2016)
  • Author(s): Giambelluca, T. W., Mudd, R. G., Liu, W., Ziegler, A. D., Kobayashi, N., Kumagai, T., Miyazawa, Y., Lim, T. K., Huang, M., Fox, J., Yin, S., Mak, S. V. and Kasemsap, P.
  • Journal Title: Water Resources Research Volume: 52 Issue: 2 Pages: 660-679
  • DOI: 10.1002/2015wr017755
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Characteristics of wood CO2 efflux in a Bornean tropical rainforest (2016)
  • Author(s): Katayama, A., Kume, T., Ohashi, M., Matsumoto, K., Nakagawa, M., Saito, T., Kumagai, T. and Otsuki, K.
  • Journal Title: Agricultural and Forest Meteorology Volume: 220 Pages: 190-199
  • Peer Reviewed / Int'l Joint Research
• [Book] Observation and modelling of net ecosystem carbon exchange over canopy. (In: Canopy Photosynthesis: From Basics to Applications. Advances in Photosynthesis and Respiration, Eds. Hikosaka, K., Anten, N. and Niinemets, U.) (2016)
  • Author(s): Kumagai, T.
  • Publisher: Springer-Verlag