Are measurements from excised leaves suitable for modeling diurnal patterns of gas exchange of intact leaves?

Miyazawa, Yoshiyuki; Tateishi, Masahiro; Komatsu, Hirokazu; Kumagai, Tomo’omi; Otsuki, Kyoichi

doi:10.1002/hyp.8107

Cited by 13 publications

(11 citation statements)

References 31 publications

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“…Fully expanded young leaves were selected for photosynthesis measurements from parts of the crown that were well-exposed to the sun and within reach of a pole pruner (5-15 m above the ground). Although excision is thought to influence leaf gas exchange, preliminary research showed that impacts of excision on gas exchange or on the model simulation of leaf gas exchange were small within an hour after excision following the procedure of Miyazawa et al (2011). For each species, three trees were selected and six leaves on excised branches were used for the measurements of the A-C i relationship.…”

Section: Measurements Of Leaf Ecophysiological Traitsmentioning

confidence: 99%

Implications of leaf-scale physiology for whole tree transpiration under seasonal flooding and drought in central Cambodia

Miyazawa

Tateishi

Komatsu

et al. 2014

Agricultural and Forest Meteorology

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Section: Measurements Of Leaf Ecophysiological Traitsmentioning

confidence: 99%

Implications of leaf-scale physiology for whole tree transpiration under seasonal flooding and drought in central Cambodia

Miyazawa

Tateishi

Komatsu

et al. 2014

Agricultural and Forest Meteorology

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“…Other studies (e.g. Meng & Arp, 1993; Miyazawa et al ., 2011) have found mixed, and sometimes contrasting effects of excision on gas exchange measurements.…”

Section: Discussionmentioning

confidence: 99%

Short‐term variation in leaf‐level water use efficiency in a tropical forest

et al. 2023

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Summary The representation of stomatal regulation of transpiration and CO2 assimilation is key to forecasting terrestrial ecosystem responses to global change. Given its importance in determining the relationship between forest productivity and climate, accurate and mechanistic model representation of the relationship between stomatal conductance (gs) and assimilation is crucial. We assess possible physiological and mechanistic controls on the estimation of the g1 (stomatal slope, inversely proportional to water use efficiency) and g0 (stomatal intercept) parameters, using diurnal gas exchange surveys and leaf‐level response curves of six tropical broadleaf evergreen tree species. g1 estimated from ex situ response curves averaged 50% less than g1 estimated from survey data. While g0 and g1 varied between leaves of different phenological stages, the trend was not consistent among species. We identified a diurnal trend associated with g1 and g0 that significantly improved model projections of diurnal trends in transpiration. The accuracy of modeled gs can be improved by accounting for variation in stomatal behavior across diurnal periods, and between measurement approaches, rather than focusing on phenological variation in stomatal behavior. Additional investigation into the primary mechanisms responsible for diurnal variation in g1 will be required to account for this phenomenon in land‐surface models.

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“…One of the limitation of this study is the use of excised leaves. In demand (Miyazawa et al, 2011) concluded that the excised leaves had the same photosynthetic rate, stomatal 359 conductance and transpiration rate as the intact leaves for up to 12 hours after being detached. The leaves of water loss from the excision more easily.…”

Section: Potential Limitations 347mentioning

confidence: 99%

Dew-induced transpiration suppression impacts the water and isotope balances ofColocasialeaves

Gerlein‐Safdi

Gauthier

Caylor³

2017

Preprint

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Foliar uptake of water from the surface of leaves is common when rainfall is scarce and non-meteoric water such as dew or fog is more abundant. However, many species in more mesic environments have hydrophobic leaves that do not allow the plant to uptake water. Unlike foliar uptake, all species can benefit from dew-or fog-induced transpiration suppression, but despite its ubiquity, transpiration suppression has so far never been quantified. Here, we investigate the effect of dew-induced transpiration suppression on the water balance and the isotopic composition of leaves via a series of experiments. Characteristically hydrophobic leaves of a tropical plant, Colocasia esculenta, are misted with isotopically enriched water to reproduce dew deposition.We measure leaf water isotopes and water potential and find that misted leaves exhibit a higher water potential (p < 0.05) and a more depleted water isotopic composition than misted leaves (p < 0.001), suggesting a ∼30% decrease in transpiration rate (p < 0.001) compared to control leaves. We propose three possible mechanisms governing the interaction of water droplets with leaf energy balance: increase in albedo from the presence of dew droplets, decrease in leaf temperature from the evaporation of dew, and local decrease in vapor pressure deficit. Comparing previous studies on foliar uptake to our results, we conclude that transpiration suppression has an effect of similar amplitude, yet opposite sign to foliar uptake on leaf water isotopes.

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Are measurements from excised leaves suitable for modeling diurnal patterns of gas exchange of intact leaves?

Cited by 13 publications

References 31 publications

Implications of leaf-scale physiology for whole tree transpiration under seasonal flooding and drought in central Cambodia

Implications of leaf-scale physiology for whole tree transpiration under seasonal flooding and drought in central Cambodia

Short‐term variation in leaf‐level water use efficiency in a tropical forest

Dew-induced transpiration suppression impacts the water and isotope balances ofColocasialeaves

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