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

Miyazawa, Yoshiyuki; Tateishi, Masahiro; Komatsu, Hirokazu; Iwanaga, Fumiko; Mizoue, Nobuya; Ma, Vuthy; Sokh, Heng; Kumagai, Tomo’omi

doi:10.1016/j.agrformet.2014.08.013

Cited by 9 publications

(7 citation statements)

References 88 publications

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“…Therefore, maintenance of m and LAI at low levels in the studied deciduous species implies that trees experienced drought events in the past and acclimated the ecophysiological traits against sudden reduction in soil moisture, sacrificing the higher carbon gain under wet soil condition. This result was in contrast to the finding in a monsoon Southeast Asian forest where trees plastically change m in dry and rainy seasons and control E (Miyazawa et al 2014a).…”

Section: Model Simulation For the Detection In Changes In Plant Ecophcontrasting

confidence: 87%

“…Such unpredictable reduction in kE was not observed in Q. acutissima and A. hirsuta with low m, possibly because E was maintained at relatively low levels in these species and was able to be balanced by root water uptake even during rainless period (Katul et al 2003). The observed m values of these species were as low as m of trees in Mediterranean climate during the dry season (Baldocchi 1997), a phreatophyte with low leaf water potential in an arid area (Miyazawa et al 2016), and trees in a monsoon Southeast Asia forest during the dry season (Miyazawa et al 2014a). Increase in m and g sw could have allowed A. hirsuta to achieve higher A both at leaf-scale (Farquhar and Sharkey 1982) and standscale (Law et al 2000).…”

Section: Model Simulation For the Detection In Changes In Plant Ecophmentioning

confidence: 91%

“…For this study, in which we address only transpiration from the overstory canopy, leaf-level gas exchange rates of leaves at different vertical positions in the canopy were computed using a biophysical model and standscale A and E mod were calculated by integrating the vertical profile of the modeled leaf-level gas exchange rates (Miyazawa et al 2014a). Here we briefly describe the model simulation.…”

Section: Model Simulation Of Canopy-scale Transpirationmentioning

confidence: 99%

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Transpiration of trees in a cool temperate forest on Mt. Aso, Japan: comparison of model simulation and measurements

Miyazawa

Inoue

Maruyama

et al. 2017

Ecological Research

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In the large caldera of Mt. Aso, Japan, artificial grasslands were converted into forests of different species due to the decline of the livestock industry in this region. These changes in species composition are thought to have changed not only the transpiration rates (E), but also the responses in E to variations in environmental conditions. For three introduced forest types, we monitored E using sap flux sensors and computed E with a multilayer model parameterized by independently obtained leaf‐scale ecophysiological traits. Modeled E replicated the time series of measured E reasonably well, but did not reproduce a decrease in E lasting 20 days after a short rainless period in conifer plantation. Mean leaf‐scale stomatal conductance of two deciduous broadleaved tree species was as low as that of trees under dry conditions in other studies, possibly an adaptation for the avoidance of excessive E during rainless periods. These results suggest that land use change influenced E and its response to the rainfall patterns of the region and that drought plays an important role in influencing species‐specific E characteristics in this rainy region. The multilayer model in combination with sap flux measurements was found to be a useful tool not only for the extrapolation of E, but also for the detection of the unexpected events, as long as the measured parameter values capture the species‐specific seasonality in leaf ecophysiological traits.

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Section: Model Simulation For the Detection In Changes In Plant Ecophcontrasting

confidence: 87%

Section: Model Simulation For the Detection In Changes In Plant Ecophmentioning

confidence: 91%

Section: Model Simulation Of Canopy-scale Transpirationmentioning

confidence: 99%

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Transpiration of trees in a cool temperate forest on Mt. Aso, Japan: comparison of model simulation and measurements

Miyazawa

Inoue

Maruyama

et al. 2017

Ecological Research

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“…As drought progresses, the photosynthetic capacity of plants will be limited by drought. Vcmax25 is an important parameter for measuring crop photosynthetic capacity, which is of great importance to plant photosynthesis and gas exchange [26,46]. Water deficit is considered to be the main environmental factor limiting Vcmax25 [47].…”

Section: Discussionmentioning

confidence: 99%

Quantitative Response of Maize Vcmax25 to Persistent Drought Stress at Different Growth Stages

Song

Zhou

et al. 2021

Water

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Drought stress has adverse effects on crop growth and yield, and its identification and monitoring play vital roles in precision crop water management. Accurately evaluating the effect of drought stress on crop photosynthetic capacity can provide a basis for decisions related to crop drought stress identification and monitoring as well as drought stress resistance and avoidance. In this study, the effects of different degrees of persistent drought in different growth stages (3rd leaf stage, 7th leaf stage and jointing stage) on the maximum carboxylation rate at a reference temperature of 25 °C (Vcmax25) of the first fully expanded leaf and its relationship to the leaf water content (LWC) were studied in a field experiment from 2013 to 2015. The results indicated that the LWC decreased continuously as drought stress continued and that the LWC decreased faster in the treatment with more irrigation. Vcmax25 showed a decreasing trend as the drought progressed but had no clear relationship to the growth stage in which the persistent drought occurred. Vcmax25 showed a significantly parabolic relationship (R2 = 0.701, p < 0.001) with the LWC, but the different degrees of persistent drought stress occurring in different growth stages had no distinct effect on the LWC values when Vcmax25 reached its maximum value or zero. The findings of this study also suggested that the LWC was 82.5 ± 0.5% when Vcmax25 reached its maximum value (42.6 ± 3.6 μmol m−2 s−1) and 67.6 ± 1.2% (extreme drought) when Vcmax25 reached zero. These findings will help to improve crop drought management and will be an important reference for crop drought identification, classification and monitoring as well as for the development of drought monitoring and early warning systems for other crops or maize varieties.

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“…Conforme el periodo de exposición de estrés se aumente, la afectación a la planta se incrementa. Estudios desarrollados por Miyazawa et al (2014) mencionan que los daños en los procesos fisiológicos de especies tropicales pueden ser permanentes, si la exposición a estrés hídrico es prolongada, y afectar la turgencia foliar, traspiración y capacidad fotosintética de forma permanente.…”

Section: Introductionunclassified

Fluorescencia, reflectancia y respuesta fisiológica al estrés hídrico en plántulas de Gmelina arborea Roxb

et al. 2021

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Se realizó una caracterización de la fluorescencia, reflectancia y respuesta fisiológica al estrés hídrico en plántulas de Gmelna arborea Roxb. Para lo cual, se desarrolló un experimento durante 31 días con dos tratamientos: plantas testigo (se aplicó un régimen hídrico normal) y plantas en condición de estrés hídrico (a las que se les limitó en su totalidad el agua por el periodo del experimento). Para ambos métodos se implementaron clones de G. arborea y se evaluaron cada siete días hasta el final del experimento, se analizó la fotosíntesis, conductancia estomática, turgencia foliar, contenido relativo de clorofila, fluorescencia y reflectancia. Los resultados mostraron que la biomasa en las plantas con estrés se redujo en un 26,9 % siendo la cobertura foliar la que mostró mayor afectación (disminución del 29,1 %), la reducción de la fotosíntesis fue del 60,1 % (5,8 µmol m-2 s-1) con respecto a la planta testigo (14,6 µmol m-2 s-1). Para las variables conductancia estomática, turgencia y contenido relativo de clorofila el comportamiento fue de disminuir sus valores de un 20 a 60 % conforme el periodo de estrés se incrementó. Con respecto a la fluorescencia se determinaron dos patrones: de los 400 a 550 nm la fluorescencia se incrementó en las plantas estresadas, mientras que a partir de los 600 a 725 nm fueron las plantas testigo las que presentaron mayor excitación, en ambos rangos se presentaron valores máximos en los puntos correspondientes a clorofila a y b. Finalmente, la reflectancia mostró diferenciación entre los 460 y 770 nm siendo las plantas en condiciones de estrés las que presentaron una reflectancia mayor. El patrón obtenido de degradación fisiológica de las plantas estresadas se debe a la pérdida de agua del organismo que incide en cierre de estomas, aumento de producción de ácido abscísico, disminución de la síntesis de pared celular y limitaciones en la síntesis de proteínas.

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

Cited by 9 publications

References 88 publications

Transpiration of trees in a cool temperate forest on Mt. Aso, Japan: comparison of model simulation and measurements

Transpiration of trees in a cool temperate forest on Mt. Aso, Japan: comparison of model simulation and measurements

Quantitative Response of Maize Vcmax25 to Persistent Drought Stress at Different Growth Stages

Fluorescencia, reflectancia y respuesta fisiológica al estrés hídrico en plántulas de Gmelina arborea Roxb

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