Kyushu University Academic Staff Educational and Research Activities Database
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Miyazawa Yoshiyuki Last modified date:2019.04.23

Assistant Professor / Campus Planning Office

Academic Degree
Country of degree conferring institution (Overseas)
Field of Specialization
Plant Ecophysiology
Total Priod of education and research career in the foreign country
Research Interests
  • Measurements and modeling of gas exchange between forest canopy and the atmosphere at leaf- and stand-levels.
    keyword : Photosynthesis, transpiration, sap flow, ecophysiology, forest, Cambodia, rubber plantation, community forestry
Academic Activities
1. 宮沢良行,杜盛,谷口武士,山中典和,熊谷朝臣, Gas exchange by the mesic-origin, arid land plantation species Robinia pseudoacacia under annual summer reduction in plant hydraulic conductance, Tree Physiology, In press, 2018.08, The mesic-origin plantation species Robinia pseudoacacia L. has been successfully grown in many arid land plantations around
the world but often exhibits dieback and reduced growth due to drought. Therefore, to explore the behavior of this species
under changing environmental conditions, we examined the relationship between ecophysiological traits, gas exchange and
plant hydraulics over a 3-year period in trees that experienced reduced plant hydraulic conductance (Gp) in summer. We found
that the transpiration rate, stomatal conductance (Gs) and minimum leaf water potential (Ψlmin) decreased in early summer in
response to a decrease in Gp, and that Gp did not recover until the expansion of new leaves in spring. However, we did not
observe any changes in the leaf area index or other ecophysiological traits at the leaf level in response to this reduction in Gp.
Furthermore, model simulations based on measured data revealed that the canopy-scale photosynthetic rate (Ac) was 15–25%
higher than the simulated Ac when it was assumed that Ψlmin remained constant after spring but almost the same as the simulated
Ac when it was assumed that Gp remained high even after spring. These findings indicate that R. pseudoacacia was frequently
exposed to a reduced Gp at the study site but offset its effects on Ac by plastically lowering Ψlmin to avoid experiencing
any further reduction in Gp or Gs..
Membership in Academic Society
  • American Geophysical Union
  • Forestry Society of Japan
  • Ecological Society of Japan
Other Educational Activities
  • 2018.05.