Gas exchange by the mesic-origin, arid land plantation species Robinia pseudoacacia under annual summer reduction in plant hydraulic conductance

Yoshiyuki Miyazawa, Sheng Du, Takeshi Taniguchi, Norikazu Yamanaka, Tomo'omi Kumagai

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)1166-1179
Number of pages14
JournalTree physiology
Volume38
Issue number8
DOIs
Publication statusPublished - Aug 1 2018

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Robinia
Robinia pseudoacacia
arid lands
gas exchange
fluid mechanics
plantations
Gases
Droughts
summer
dieback
leaf water potential
leaf area index
stomatal conductance
Water
leaves
transpiration
simulation models
Growth
drought
canopy

All Science Journal Classification (ASJC) codes

  • Physiology
  • Plant Science

Cite this

Gas exchange by the mesic-origin, arid land plantation species Robinia pseudoacacia under annual summer reduction in plant hydraulic conductance. / Miyazawa, Yoshiyuki; Du, Sheng; Taniguchi, Takeshi; Yamanaka, Norikazu; Kumagai, Tomo'omi.

In: Tree physiology, Vol. 38, No. 8, 01.08.2018, p. 1166-1179.

Research output: Contribution to journalArticle

Miyazawa, Yoshiyuki ; Du, Sheng ; Taniguchi, Takeshi ; Yamanaka, Norikazu ; Kumagai, Tomo'omi. / Gas exchange by the mesic-origin, arid land plantation species Robinia pseudoacacia under annual summer reduction in plant hydraulic conductance. In: Tree physiology. 2018 ; Vol. 38, No. 8. pp. 1166-1179.
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