Night-time transpiration, predawn hydraulic conductance and water potential disequilibrium in hybrid aspen coppice

Kangur, Ott; Tullus, Arvo; Sellin, Arne

doi:10.1007/s00468-019-01903-9

Cited by 6 publications

(5 citation statements)

References 46 publications

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“…The response of T n to VPD n and G c-n was similar to that of E n , but different to that of R e (Figure 6). A positive relationship between R e and the VPD of previous day was reported for hybrid aspen coppice [6], indicating a high proportion of SF n in the refilling of dehydrated tissues. However, the driving force of stem refilling became weak with the decrease in water demand [54], especially under high levels of VPD n .…”

Section: Environmental and Stomatal Effects On Nocturnal Water Usementioning

confidence: 73%

“…However, the driving force of stem refilling became weak with the decrease in water demand [54], especially under high levels of VPD n . The difference in the environmental and stomatal mechanisms between T n and R e dynamics might be related to disequilibrium between leaf and soil water potentials and the whole tree's hydraulic conductance [6]. Therefore, analysis of plant hydraulic capacity in planted forests should be undertaken in the future.…”

Section: Environmental and Stomatal Effects On Nocturnal Water Usementioning

confidence: 99%

“…During the past two decades, nocturnal water use has been reported across a range of forest species and habitats; and the average contribution of nocturnal water use to daily water use is approximately 12% in diverse woody species, and reaches up to 30-60% in water-limited environments [1][2][3][4][5]. The occurrence, pattern and alteration of nocturnal water use play important roles in adjusting predawn disequilibrium between leaves and soil [6], reducing hydraulic redistribution within dry rhizosphere soils [7], avoiding the delay between carbon assimilation and stomatal opening in the early morning hours [8,9] and facilitating oxygen and nutrient uptake for tree growth [10,11]. Therefore, nocturnal water use is regarded as a special water use strategy that enables plants to adapt to different environments, and the accurate quantification of nocturnal water use and its contribution to total daily water use is important for understanding the carbon and water budgets of forest ecosystems [12].…”

Section: Introductionmentioning

confidence: 99%

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Nocturnal Water Use Partitioning and Its Environmental and Stomatal Control Mechanism in Caragana korshinskii Kom in a Semi-Arid Region of Northern China

Li,

Zhang,

Wang

et al. 2023

Forests

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As an important aspect of plant water consumption, nocturnal water use (En) behavior provides reliable information on the effect of plantation carbon and water budgets at stand and regional scales. Therefore, quantifying En and its environmental and stomatal controlling mechanisms is urgent to establish adaptation strategies for plantation management in semiarid regions. With the help of the sap flow technique, our study investigated the seasonal variations in canopy transpiration and canopy conductance in a Caragana korshinskii Kom plantation. Environmental variables were measured concurrently during the growing seasons of 2020 and 2021. The results indicated that the average En values were 0.10 mm d−1 and 0.09 mm d−1, which accounted for 14% and 13% of daily water use, respectively, over two years. The proportions of nocturnal transpiration (Tn) to En were approximately 49.76% and 54.44%, while stem refilling (Re) accounted for 50.24% and 45.56% of En in 2020 and 2021, respectively, indicating that C. korshinskii was able to draw on stored stem water to support transpiration. En was predominantly affected by nocturnal canopy conductance (Gc–n), air temperature (Ta–n) and wind speed (u2-n). In contrast, Gc–n and Ta–n explained the highest variation in Tn and nocturnal vapor pressure (VPDn), and u2-n explained the highest variation in Re. Total effects of the five environmental and stomatal variables explained 50%, 36% and 32% of En, Tn and Re variation, respectively. These findings could enable a better understanding of nocturnal water use dynamics and their allocation patterns in C. korshinskii plantations on the Bashang Plateau. Moreover, our results reveal the water use strategies of artificial shrubs and highlight the importance of incorporating nocturnal water use processes into large-scale ecohydrological models in semiarid regions.

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Section: Environmental and Stomatal Effects On Nocturnal Water Usementioning

confidence: 73%

Section: Environmental and Stomatal Effects On Nocturnal Water Usementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nocturnal Water Use Partitioning and Its Environmental and Stomatal Control Mechanism in Caragana korshinskii Kom in a Semi-Arid Region of Northern China

Li,

Zhang,

Wang

et al. 2023

Forests

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“…Mature trees with a high Ψ pd may uptake deeper water resources, and saplings were likely to utilize the water sources closer to the soil surface because of the drop in Ψ pd . Predawn plant water potential does not always correspond with the available soil water potential according to investigations of plant nocturnal sap flow, which have identified an imbalance between the predawn leaf water potential and soil water potential in several species [58,59]. However, field studies have also shown that soil water potential and Ψ pd are closely related under various water treatments, even when there is little transpiration at night, and Ψ pd can be used as a rough substitute for the water potential of soil, from which plants extract water [60].…”

Section: Comparison Of Water Sources Between Saplings and Mature Treesmentioning

confidence: 99%

Comparative Apparent Hydraulic Conductance, Leaf Gas Exchange, and Water Resource Partitioning of Populus euphratica Trees and Saplings

Chen

Hao

Zhu

2022

Forests

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Water acquisition via the root system of woody species is a key factor governing plant physiology. In order to compare the impact of water acquisition on the hydraulic and photosynthetic characteristics of different-sized Populus euphratic, which is a desert riparian tree species, we quantified leaf hydraulic conductance (KL), stomatal conductance (gs), net photosynthetic rate (PN), predawn and midday leaf water potential (Ψ), and the stem δ18O of the saplings and mature trees. The results showed that the saplings had a lower predawn leaf water potential (Ψpd) and soil-to-leaf water potential gradient (ΔΨ) and a higher KL than the mature trees but had a similar gs and PN to the mature trees. In arid zones, probably due to root limitation, the saplings were more likely to use unreliable topsoil water (<80 cm), whereas the mature trees typically uptake reliable deep soil water (>80 cm) and groundwater due to having deeper root systems. The unreliability of the water supply might make saplings hold a higher hydraulic conductance to ensure that the water is transported efficiently to the leaves and to satisfy their transpiration need. In contrast, the mature trees, which uptake the more reliable deeper water resources, had a relatively low leaf-specific hydraulic conductance because of the increased path length versus the saplings. However, adult trees can maintain stomatal conductance by upregulating ΔΨ, thereby facilitating their ability to maintain a carbon assimilation rate similar to that of the saplings. This regulating behavior benefits mature trees’ net carbon gain, but it comes at the expense of an increased risk of hydraulic failure. These results imply that the top priority for saplings should be to maintain hydraulic system functioning, whereas, for mature trees, the priority is to assure stable net carbon gain for their growth.

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“…Leaf water potential ( Ψ ), in particular, is the principal driver for stomatal conductance and photosynthetic carbon absorption ( Novick et al., 2022 ), and can effectively be used to evaluate the trade-off between water-source use and plant water deficit ( Zunzunegui et al., 2022 ). In addition, the hydraulic capacity of plants, that is, the water transfer efficiency from the root surface to the leaves, accurately determines Ψ ( Kangur et al., 2020 ). In water-stressed environments, isohydric species gradually close their stomata to strictly control Ψ , whereas anisohydric species maintain their stomata open, making Ψ drop sharply as water availability decreases.…”

Section: Introductionmentioning

confidence: 99%

Water use strategies of Nitraria tangutorum in the lake-basin region of the Badain Jaran Desert

Qin,

Si,

Jia

et al. 2023

Front. Plant Sci.

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Information regarding plant water-use strategies is essential for understanding the hydrological processes and plant survival adaptation mechanisms in desert lake basin regions. To examine the water use strategies of plants in desert lake basin areas, water uptake patterns, water use efficiency, and water potential of Nitraria tangutorum were investigated at different distances from the lake duringhe growing seasons in the lake basin regions of the Badain Jaran Desert. The results indicate that N. tangutorum primarily absorbed groundwater in May (63.8%) and August (53.5%), relied on deep soil water in June (75.1%), and uniformly absorbed soil water from different layers in July. These observations could be explained by periodic fluctuations in the groundwater level and the consequent decrease in soil water availability, as well as plant root adjustments. As soil water availability decreases, N. tangutorum adapts to water variation by increasing its water use efficiency (WUE) and reducing its leaf water potential (Ψ). With intensified water stress, N. tangutorum gradually shifted from adventurous anisohydric regulation to conservative isohydric regulation. Thus, N. tangutorum responds to diverse degrees of environmental changes by altering its water-use strategy. A better understanding of the adaptive water use strategies developed by desert plants under varying water availability conditions provides insight into the diversity of species’ reactions to long-term drought and quantifies the hydrological cycle of desert ecosystems against the background of worldwide climate warming.

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Night-time transpiration, predawn hydraulic conductance and water potential disequilibrium in hybrid aspen coppice

Cited by 6 publications

References 46 publications

Nocturnal Water Use Partitioning and Its Environmental and Stomatal Control Mechanism in Caragana korshinskii Kom in a Semi-Arid Region of Northern China

Nocturnal Water Use Partitioning and Its Environmental and Stomatal Control Mechanism in Caragana korshinskii Kom in a Semi-Arid Region of Northern China

Comparative Apparent Hydraulic Conductance, Leaf Gas Exchange, and Water Resource Partitioning of Populus euphratica Trees and Saplings

Water use strategies of Nitraria tangutorum in the lake-basin region of the Badain Jaran Desert

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