Nocturnal sap flow is mainly caused by stem refilling rather than nocturnal transpiration for Acer truncatum in urban environment

Wu, Ju; Liu, Haixuan; Zhu, Jiyou; Gong, Li; Xu, Lei; Jin, Guixiang; Li, Jing; Hauer, Richard J.; Xu, Chengyang

doi:10.1016/j.ufug.2020.126800

Cited by 15 publications

(43 citation statements)

References 34 publications

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“…Wind speed affected the moisture movement around plant canopy (Fricke 2019 ) and thus influenced on nocturnal water loss (Chen et al 2020), which also could not be ignored. In this study, we found that wind speed was not a driving force in sap flow, whether during the daytime or nighttime, which is consistent with the result that wind speed had little effects on the nocturnal water loss by Wang et al 2018and Wu et al 2020. Rosado et al (2012 found strong positive relationships between VPD andQ n in woody species in rain forest and indicated that the E n was driven by atmospheric demand for water.…”

Section: Driving Force Of Nocturnal Sap Flow In Mangrovessupporting

confidence: 86%

“…Growing evidence has suggested that in some plants the stomata remained open or partially open at night (Gindel, 1970;Caird et al, 2007;Fisher et al, 2007;Zhao et al, 2017), and that incomplete stomata closure provides the structure basic for nocturnal transpiration. Vapor pressure deficit (VPD) has been identified in some studies as the most crucial environmental driver of nocturnal transpiration (Fisher et al, 2007;Dawson et al, 2007;Wu et al, 2020;Zeppel et al, 2014). Other studies reported negative (Bucci et al, 2004) or negligible effects (Barbour et al, 2005) of VPD on nocturnal stomata.…”

Section: Introductionmentioning

confidence: 99%

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Nocturnal Sap Flow as Compensation for Water Deficits: An Implicit Water-saving Strategy Used by Mangroves in Stressful Environments

Chen

et al. 2022

Preprint

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As part of the plant water-use process, plant nocturnal sap flow ( Q) has been demonstrated to have important ecophysiological significance to compensate for water loss. The purpose of this study was to explore nocturnal water-use strategies to fill the knowledge gap in mangroves, by measuring three species co-occurring in a subtropical estuary. The Q existed persistently and contributed markedly over 5.5%~24.0% of the daily sap flow ( Q) across species, which was associated with two processes, nocturnal transpiration ( E) and nocturnal stem water refilling ( R). The diversity of stem recharge patterns and response to sap flow to high salinity conditions were the main reasons for the differences in Q/ Q among species. For Kandelia obovata and Aegiceras corniculatum, R was the main contributor to Q, which driven by the demands of stem water refilling after diurnal water depletion and high salinity. In contrast, Avicennia marina maintained a low Q, driven by vapor pressure deficit, and the Q mainly used for E, which adapts to high salinity conditions by limiting water dissipation at night. We conclude that the diverse ways Q properties act as water-compensating strategies among the co-occurring mangrove species might help the trees to overcoming water scarcity.

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Section: Driving Force Of Nocturnal Sap Flow In Mangrovessupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Nocturnal Sap Flow as Compensation for Water Deficits: An Implicit Water-saving Strategy Used by Mangroves in Stressful Environments

Chen

et al. 2022

Preprint

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“…The xylem water column generates tension and a large amount of water enters the roots; the water enters the tree in a passive way. The sap flow at night was caused by root water potential, and water was actively absorbed into the tree to replace the water lost by daytime transpiration ( Wu et al, 2020 ). In addition, the sap flow is more active in the first half of the night than that in the second half of the night.…”

Section: Discussionmentioning

confidence: 99%

“…However, studies on daytime sap flow in trees have mainly been carried out in plantations. The lack of information and studies on the diurnal sap flow of urban landscape trees has led to the underestimation of plant water consumption and subsequent decline in their growth and longevity ( Wu et al, 2020 ). Therefore, the common green tree species of F. pennsylvanica found in North China is used as the research object of this study to investigate diurnal sap flow change patterns.…”

Section: Introductionmentioning

confidence: 99%

Sap Flow Velocity in Fraxinus pennsylvanica in Response to Water Stress and Microclimatic Variables

2022

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In arid and semiarid regions with water shortage, forestry development is limited by water availability. Understanding how tree sap flow responds to water stress and microclimatic variables is essential for the management of trees and the understanding of the eco-physiological properties of trees in arid areas. In the city of Tianjin in northern China, we measured the sap flow of Fraxinus pennsylvanica, a widely distributed urban greening tree species in semiarid regions of China. We measured the sap flow in four F. pennsylvanica trees over 6 months (April–September 2021), using a thermal diffusion probe method, and simultaneously monitored microclimatic variables and soil moisture. Results indicated that high nighttime sap flow velocity might be produced under the water stress condition. In addition, the nighttime sap flow velocity under the water stress condition was more susceptible to the combined effects of meteorological factors at night. The daytime sap flow velocity exerted a highly significant positive effect on the nighttime sap flow velocity during the whole research period, and the model fit was higher in the early growing season than that in the late growing season (early growing season: R2 = 0.51, P < 0.01; late growing season: R2 = 0.36, P < 0.01). Vapor pressure deficit had a positive effect on daytime sap flow. However, net vapor pressure deficit restrained daytime sap flow velocity when the intercorrelation between the microclimatic variables was removed. Our study highlights that drought areas perhaps have higher nighttime sap flow and that more emphasis should be placed on nighttime sap flow and the response of nighttime sap flow to microclimatic variables. In addition, the influence of other microclimatic variables on vapor pressure deficit needs to be considered when analyzing the relationship between daytime sap flow and vapor pressure deficit. An increase in net VPD can suppress the daytime sap flow.

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“…There were no significant interactive effects on sap flow rates for trees exposed to both elevated temperatures and elevated CO 2 levels, suggesting that temperature plays a dominant role on sap flow 18 . Finally, it has been reported that stem-stored water can provide for sap flow following over-night re-filling 20 , 21 . This phenomenon could potentially affect the influence of RH on sap flow during the hours of early morning such that there could be a time-lag between sap flow and effects of RH.…”

Section: Introductionmentioning

confidence: 99%

Sap flow of sweet cherry reveals distinct effects of humidity and wind under rain covered and netted protected cropping systems

Stone

Corkrey

et al. 2022

Sci Rep

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Protected cropping systems (PCS) alter the plant growing environment, though understanding of this in ventilated systems and how the new climate affects tree water uptake is limited. Sap flow sensors and weather stations were deployed in 16-year-old ‘Lapins’ on ‘Colt’ rootstock cherry trees under a ventilated Voen PCS and in an adjacent bird netted PCS. Average and maximum temperatures were consistently higher (14.7 °C and 22.9 °C) while total daily solar radiation and average wind were consistently lower (12.9 MJ/m2 and 0.2 m/s) in rain covered, in contrast to netted, PCS (13.9 °C, 21.3 °C, 13.7 MJ/m2 and 0.9 m/s). Over the season, a threefold lower daily sap flow rate was observed under rain covered PCS. Using generalised additive modelling (GAM), the influence of individual climate parameters on sap flow were predicted. Whilst sap flow was only slightly affected by relative humidity (RH) less than 60%, above this threshold sap flow rapidly declined under rain covered PCS whereas sap flow more gradually declined above 20% RH under netted PCS. Overall, our novel modelling approach led to the discovery of the 60% RH critical threshold on predicted sap flow and the indirect effect that wind speeds have on sap flow under PCS.

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Nocturnal sap flow is mainly caused by stem refilling rather than nocturnal transpiration for Acer truncatum in urban environment

Cited by 15 publications

References 34 publications

Nocturnal Sap Flow as Compensation for Water Deficits: An Implicit Water-saving Strategy Used by Mangroves in Stressful Environments

Nocturnal Sap Flow as Compensation for Water Deficits: An Implicit Water-saving Strategy Used by Mangroves in Stressful Environments

Sap Flow Velocity in Fraxinus pennsylvanica in Response to Water Stress and Microclimatic Variables

Sap flow of sweet cherry reveals distinct effects of humidity and wind under rain covered and netted protected cropping systems

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