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, Masahiro; Inoue, Yuta; Yoneyama, Aogu; Nakashizuka, Tohru

doi:10.1007/s10265-019-01161-3

Cited by 10 publications

(6 citation statements)

References 74 publications

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“…Although the present study focused on seedlings of dipterocarp species, if mature dipterocarp trees show a similar response to drought, the large number of tree species exhibiting anisohydric responses in this study may influence the forest-wide response to ENSO-induced drought. Supporting our findings, in a rainfall excursion experiment with mature DrA trees conducted in Lambir Hills National Park, stomatal conductance did not decrease significantly in response to soil drought (Yoshifuji et al, 2020); instead, leaf drought tolerance was enhanced via a decrease in tlp (Inoue et al, 2017). The similar response by mature trees and seedlings of DrA suggests a close relationship between seedlings and mature trees with regard to drought response.…”

Section: Discussionsupporting

confidence: 82%

“…A significant increase in dipterocarp mortality was reported during a severe ENSO-induced drought (Nakagawa et al, 2000;Slik, 2004;van Nieuwstadt and Sheil, 2005;Newbery and Lingenfelder, 2009;Itoh et al, 2012). Moreover, experiments on the responses of several dipterocarp species to controlled drought revealed that mature trees of Dryobalanops aromatica increased their leaf drought tolerance via altered osmotic regulation (Inoue et al, 2017) without a significant reduction in leaf stomatal conductance (Yoshifuji et al, 2020). This species had a lower mortality rate under ENSO-induced drought compared to other dipterocarps (Hiromi et al, 2012), suggesting that responses to drought might vary widely among this family.…”

Section: Introductionmentioning

confidence: 93%

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Ecophysiological responses of seedlings of six dipterocarp species to short-term drought in Borneo

Ichie

Igarashi

Tanimoto

et al. 2023

Front. For. Glob. Change

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To predict the dynamics of tropical rainforest ecosystems in response to climate change, it is necessary to understand the drought tolerance and related mechanisms of trees in tropical rainforests. In this study, we assessed the ecophysiological responses of seedlings of six dipterocarp species (Dipterocarpus pachyphyllus, Dryobalanops aromatica, Shorea beccariana, S. curtisii, S. parvifolia, and S. smithiana) to experimental short-term drought conditions. The seedlings were initially grown in plastic pots with sufficient irrigation; irrigation was then stopped to induce drought. Throughout the soil-drying period, we measured various ecophysiological parameters, such as maximum photosynthetic and transpiration rates, stomatal conductance, water-use efficiency, predawn water potential, the maximum quantum yield of photosystem II (Fv/Fm), leaf water characteristics (using pressure-volume curves), leaf water content, and total sugar and starch contents. In all six dipterocarp species studied, the Fv/Fm values dropped sharply when the soil water content fell below 8%. However, there were interspecific differences in physiological responses to such a decrease in soil water content: S. parvifolia and S. beccariana actively controlled their stomata during drought to reduce water consumption via an isohydric response, but showed an increase (S. parvifolia) or no change (S. beccariana) in leaf drought tolerance; Di. pachyphyllus and Dry. aromatica maintained photosynthesis and transpiration close to the wilting point during drought without reducing water consumption via an anisohydric response, and also increased their leaf drought tolerance over the drying period; and S. curtisii and S. smithiana maintained their photosynthetic capacity without stomatal closure, but showed no change or a slight decrease in leaf drought tolerance. Our results indicate that extreme drought can cause the death of dipterocarp seedlings via various drought response, which could substantially impact the future distribution, population dynamics, and structure of tropical rainforests.

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Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 93%

Ecophysiological responses of seedlings of six dipterocarp species to short-term drought in Borneo

Ichie

Igarashi

Tanimoto

et al. 2023

Front. For. Glob. Change

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“…Canopy conductance was easily affected by different environmental conditions which was an important biological factor indicating the response of ecosystem to environmental factors (Igarashi et al, 2015). Changes in canopy conductance and control mechanisms had been applied to different ecosystems, such as poplar plantations (Song et al, 2021), tropical rainforest (Yoshifuji et al, 2020), farmland shelterbelt (Fu et al, 2016), and temperate deciduous forests (Wehr et al, 2017) conduct research. In addition to tree species, the reason for the difference in canopy conductance was that the regional environment also played a particularly important role in driving the change in canopy conductance (Saito et al, 2017).…”

Section: Effects Of Environmental Factors On Canopy Conductance At Di...mentioning

confidence: 99%

Characteristics of Canopy Conductance and Environmental Driving Mechanism in Three Monsoon Climate Regions of China

Jia

Yan

et al. 2022

Front. Environ. Sci.

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Canopy conductance was an important index to measure the process of water exchange between canopy and atmosphere interface of forest ecosystem, as well as to judge the status of water use or the degree of drought stress. Therefore, the accurate estimation of forest canopy conductance was of great significance for the research of water-use efficiency. In the past, canopy conductance was measured on vegetation types in a single-point region, but there were few studies on systematic comparison in different climate zones. Based on the data sets of EC flux and conventional meteorological elements from the eddy covariance (EC) flux observation station during 2003–2010 in three typical climate zones (temperate continental monsoon climate zone, south subtropical monsoon climate zone, and mid-subtropical monsoon climate zone), Penman-Monteith model was used to calculate forest canopy conductance in different climate regions and analyze the dynamic changes of canopy conductance in different time scales. At the same time, combined with environmental factors including temperature, net radiation, soil water content, and vapor pressure deficit to explore their driving ability on the canopy conductivity of forest ecosystem in different climate regions, we finally explored the mechanism driving the canopy conductivity of forest ecosystem under different climates. The results showed that: 1) the driving ability of environmental factors in different climate regions to the canopy conductance was different, and the contribution rate of soil water content to the canopy conductance in subtropical monsoon climate zone was the largest. It was 36.01%, and the contribution rate of vapor pressure deficit to the canopy conductance in mid-subtropical monsoon climate region was the largest. It was 29.4% and the contribution rate of temperature to the canopy conductance in temperate monsoon climate region was the largest; it was 28.14%. 2). Temperature was an important factor limiting and driving canopy conductance, and there was a synergistic effect between water and temperature, which jointly drove the change in canopy conductance. 3) Environmental factors in different climate regions had threshold for the synergistic driving effect of canopy conductance. When the factors were within the appropriate threshold, the factors had a strong promoting effect on canopy conductance.

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“…Although the genetic background of such intrinsic properties has been questioned [66,67], and a continuum between both behaviors has been proposed instead [68], the expanded hydricity concept of Meinzer et al [69] has proven useful in plant ecohydrology. Anisohydric performance has been shown for part of the trees of a moist tropical forest in Borneo [70,71], while isohydric behavior appears to prevail in an Amazon lowland forest [72]. Regarding the trees investigated in this study, isohydric-like performance could be attributed to Ocotea and anisohydric-like to Tapirira: It exhibited a comparatively high water consumption, and its…”

Section: The Tree Level: Water Relations and Hydrological Typesmentioning

confidence: 64%

Trees with anisohydric behavior as main drivers of nocturnal evapotranspiration in a tropical mountain rainforest

et al. 2023

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This study addresses transpiration in a tropical evergreen mountain forest in the Ecuadorian Andes from the leaf to the stand level, with emphasis on nocturnal plant-water relations. The stand level: Evapotranspiration (ET) measured over 12 months with the Eddy-Covariance (ECov) technique proved as the major share (79%) of water received from precipitation. Irrespective of the humid climate, the vegetation transpired day and night. On average, 15.3% of the total daily ET were due to nocturnal transpiration. Short spells of drought increased daily ET, mainly by enhanced nighttime transpiration. Following leaf transpiration rather than air temperature and atmospheric water vapor deficit, ET showed its maximum already in the morning hours. The tree level: Due to the humid climate, the total water consumption of trees was generally low. Nevertheless, xylem sap flux measurements separated the investigated tree species into a group showing relatively high and another one with low sap flux rates. The leaf level: Transpiration rates of Tapirira guianensis, a member of the high-flux-rate group, were more than twice those of Ocotea aciphylla, a representative of the group showing low sap flux rates. Representatives of the Tapirira group operated at a relatively high leaf water potential but with a considerable diurnal amplitude, while the leaves of the Ocotea group showed low water potential and small diurnal fluctuations. Overall, the Tapirira group performed anisohydrically and the Ocotea group isohydrically. Grouping of the tree species by their water relations complied with the extents of the diurnal stem circumference fluctuations. Nighttime transpiration and hydrological type: In contrast to the isohydrically performing trees of the Ocotea group, the anisohydric trees showed considerable water vapour pressure deficit (VPD)-dependent nocturnal transpiration. Therefore, we conclude that nighttime ET at the forest level is mainly sourced by the tree species with anisohydric performance.

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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

Cited by 10 publications

References 74 publications

Ecophysiological responses of seedlings of six dipterocarp species to short-term drought in Borneo

Ecophysiological responses of seedlings of six dipterocarp species to short-term drought in Borneo

Characteristics of Canopy Conductance and Environmental Driving Mechanism in Three Monsoon Climate Regions of China

Trees with anisohydric behavior as main drivers of nocturnal evapotranspiration in a tropical mountain rainforest

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