Limited stomatal regulation of the largest-size class of Dryobalanops aromatica in a Bornean tropical rainforest in response to artificial soil moisture reduction

Natsuko Yoshifuji, Tomo’omi Kumagai, Tomoaki Ichie, Tomonori Kume, Makiko Tateishi, Yuta Inoue, Aogu Yoneyama, Tohru Nakashizuka

Research output: Contribution to journalArticle

Abstract

The physiological response of trees to drought is crucial for understanding the risk of mortality and its feedbacks to climate under the increase in droughts due to climate change, especially for the largest trees in tropical rainforests because of their large contribution to total carbon storage and water use. We determined the response of the mean canopy stomatal conductance per unit leaf area (gs) and whole-tree hydraulic conductance (Gp) of the largest individuals (38–53 m in height) of a typical canopy tree species in a Bornean tropical rainforest, Dryobalanops aromatica C.F.Gaertn., to soil moisture reduction by a 4-month rainfall exclusion experiment (REE) based on the measurements of sap flux and leaf water potentials at midday and dawn. In the mesic condition, the gs at vapor pressure deficit (D) = 1 kPa (gsref) was small compared with the reported values in various biomes. The sensitivity of gs to D (m) at a given gsref (m/gsref) was ≥ 0.6 irrespective of soil moisture conditions, indicating intrinsically sensitive stomatal control with increasing D. The REE caused greater soil drought and decreased the mean leaf water potentials at midday and dawn to the more negative values than the control under the relatively dry conditions due to natural reduction in rainfall. However, the REE did not cause a greater decrease in gs nor any clear alteration in the sensitivity of gs to D compared with the control, and induced greater decreases in Gp during REE than the control. Thus, though the small gs and the sensitive stomatal response to D indicate the water saving characteristics of the studied trees under usual mesic conditions, their limited stomatal regulation in response to soil drought by REE and the resulting decline in Gp might suggest a poor resistance to the unusually severe drought expected in the future.

Original languageEnglish
JournalJournal of Plant Research
DOIs
Publication statusAccepted/In press - Jan 1 2019

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Dryobalanops aromatica
tropical rain forests
soil water
rain
drought
mesic conditions
leaf water potential
canopy
vapor pressure
carbon sequestration
physiological response
sap
stomatal conductance
soil
fluid mechanics
leaf area
water
climate change
climate
ecosystems

All Science Journal Classification (ASJC) codes

  • Plant Science

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Limited stomatal regulation of the largest-size class of Dryobalanops aromatica in a Bornean tropical rainforest in response to artificial soil moisture reduction. / Yoshifuji, Natsuko; Kumagai, Tomo’omi; Ichie, Tomoaki; Kume, Tomonori; Tateishi, Makiko; Inoue, Yuta; Yoneyama, Aogu; Nakashizuka, Tohru.

In: Journal of Plant Research, 01.01.2019.

Research output: Contribution to journalArticle

Yoshifuji, Natsuko ; Kumagai, Tomo’omi ; Ichie, Tomoaki ; Kume, Tomonori ; Tateishi, Makiko ; Inoue, Yuta ; Yoneyama, Aogu ; Nakashizuka, Tohru. / Limited stomatal regulation of the largest-size class of Dryobalanops aromatica in a Bornean tropical rainforest in response to artificial soil moisture reduction. In: Journal of Plant Research. 2019.
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