Contrasting growth and water use strategies in four co-occurring Mediterranean tree species revealed by concurrent measurements of sap flow and stem diameter variations

Sánchez-Costa, Elisenda; Poyatos, Rafael; Sabaté, Santiago

doi:10.1016/j.agrformet.2015.03.012

Cited by 86 publications

(76 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A previous study reported that Js for different species had a nonlinear negative relationship to ∆W when VPD > 0.5 kPa and solar radiation > 150 W·m −2 , and that it was related to soil water content [12]. However, we observed a strong nonlinear increase in Js with an increase in ∆W in Qinghai spruce, with Js subsequently gradually stabilizing when ∆W reached over 50 mm (Figure 3).…”

Section: Seasonal Course Of Sap Flow Density and Tree Water Deficitcontrasting

confidence: 43%

“…The significant positive nonlinear relationships between ∆W and R, and ∆W and VPD suggested that drought stress intensified with high solar radiation and vapor pressure deficit. High values of both factors increased water loss by transpiration, exacerbating drought stress [12,58,59]. Several studies reported that ∆W was significantly positively related to air temperature [18,19], which both influence transpiration.…”

Section: Environmental Control On Sap Flow Density and Tree Water Defmentioning

confidence: 99%

“…Based on the growth trend, daily weighted mean basal area increment (BAI, cm 2 ) of monitored trees was calculated (Figure 2f). To study water use strategies of Qinghai spruce for different growth periods, water-use efficiency (WUE) was defined as the ratio of BAI and Jt (WUE = BAI/Jt) [12]. Daily WUE was calculated based on the weighted mean BAI and Jt.…”

Section: Stem Radial Change Measurements and Related Parametersmentioning

confidence: 99%

See 2 more Smart Citations

Growing Season Stem Water Status Assessment of Qinghai Spruce through the Sap Flow and Stem Radial Variations in the Qilian Mountains of China

Tian

Xiao

et al. 2017

Forests

View full text Add to dashboard Cite

Global climate change is likely to change precipitation patterns with consequences for tree water use and growth in semi-arid areas. However, little is known about the effects of variability in precipitation on growth-and water-related physiological processes of native trees in dry areas of northwestern China. In this study, sap flow and stem radial variability in four Qinghai spruce trees (Picea crassifolia) were monitored in the Qilian Mountains, China. Tree water deficit (∆W) and basal area increment (BAI) were calculated using stem radial variation; water-use efficiency (WUE) was then estimated as the ratio of BAI and sap flow (Jt). The results showed that sap flow density (Js) increased logarithmically with increasing ∆W when ∆W < 50 µm, and then gradually stabilized. Multiple factor generalized additive models (GAM) showed that Js was closely related to all measured environmental variables except for daily mean temperature and relative air humidity. ∆W was related to the minimum daily temperature and soil water content. WUE exhibited higher values in early July. Low WUE was observed under conditions of prolonged dry weather, but it quickly increased during rainy days. WUE decreased after precipitation events due to high transpiration. We concluded that, in these semi-arid areas, precipitation is the most important controlling factor in tree growth and transpiration.

show abstract

Section: Seasonal Course Of Sap Flow Density and Tree Water Deficitcontrasting

confidence: 43%

Section: Environmental Control On Sap Flow Density and Tree Water Defmentioning

confidence: 99%

Section: Stem Radial Change Measurements and Related Parametersmentioning

confidence: 99%

See 1 more Smart Citation

Growing Season Stem Water Status Assessment of Qinghai Spruce through the Sap Flow and Stem Radial Variations in the Qilian Mountains of China

Tian

Xiao

et al. 2017

Forests

View full text Add to dashboard Cite

show abstract

“…Although many papers (e.g., Ehrenberger et al, ; Oberhuber, Hammerle, & Kofler, ; Oberhuber, Kofler, Schuster, & Wieser, ; Sánchez‐Costa, Poyatos, & Sabaté, ) deal with tree water status (or tree water deficit, Δ W ) calculated throughout the daily courses, we focused on extracted morning Δ W , which seems to be more connected to soil water availability represented by Ψ . When the soil is not fully hydrated, soil and stem water potentials are lower, and water storage pools are no longer replenished overnight (Steppe et al, ).…”

Section: Discussionmentioning

confidence: 99%

Drought and irrigation affect transpiration rate and morning tree water status of a mature European beech (Fagus sylvatica L.) forest in Central Europe

et al. 2018

View full text Add to dashboard Cite

Severity and frequency of recurrent droughts is likely to be amplified by recent climate changes and may adversely affect large areas of temperate forests. This study addresses the ecophysiological responses of a mature beech forest in Central Europe (Slovakia, 450 m a.s.l.) exposed to drought during the growing seasons of 2012–2014. Sap flow and stem circumference changes of European beech (Fagus sylvatica L.) were measured in two contrasting treatments (drought vs. irrigation). Limited water availability reflected in the morning tree water status (morning stem contraction, ΔW) significantly reduced transpiration. Trees stressed by drought in the years 2012 and 2013 showed remarkably lower values of morning ΔW than those in the irrigated group. This suggests (a) lower water potential of the stem‐conducting tissues and (b) increased use of internally stored water to maintain daily transpiration. Additionally, morning ΔW showed a close relationship with soil water potential, particularly in the nonirrigated trees. Potential evapotranspiration (PET) explained less variability in the transpiration of the control stand than that of the irrigated stand. The use of a simple analysis of covariance model comprising morning ΔW and PET interaction significantly increased the explained variability in transpiration in the control stand. Morning ΔW of mature beech trees seems to be a useful and easily obtainable non‐invasive bioindicator of their ability to reduce and regulate transpiration in relation to atmospheric evaporative demands in response to drought.

show abstract

“…Sap flow is higher in winter than in summer, but trees do not allocate carbon to aboveground growth in winter (Sánchez-Costa et al 2015). Thus, carbon assimilated during winter is likely to be directed to other functions, such as defence or cold hardening.…”

Section: Trends Of Crown Defoliation and Their Relationship With Droumentioning

confidence: 99%

Sequence of plant responses to droughts of different timescales: lessons from holm oak (Quercus ilex) forests

Barbeta

Peñuelas

2016

Plant Ecology & Diversity

View full text Add to dashboard Cite

The functional traits of plants in regions of the world with a Mediterranean climate have been shaped to tolerate periods of water deficit. These species are adapted to summer droughts but may not be able to cope with future increases in drought intensity, duration, and/or frequency. Here, we review the mechanisms and traits of drought resistance and recovery of the well-studied holm oak (Quercus ilex), which we propose as a model species for Mediterranean-type ecosystems. Our aim was to understand the differences and links between the responses of Q. ilex to summer droughts, extreme droughts, and long-term drought experiments. A main goal was to provide an integral picture of drought responses across organisational and temporal scales for identifying the most relevant processes that are likely to contribute to determining the future of Mediterranean vegetation. Evidence from long-term drought experiments showed that acclimation processes from the molecular (e.g. epigenetic changes) to the ecosystem level (e.g. reductions in stand density) mitigate the effects of drought. Changes in leaf morphology and hydraulics, leaf-to-shoot allometry, and root functioning are among the key mechanisms for overcoming increasing drought. The duration of drought determines its severity in terms of canopy loss and stem mortality. Although Q. ilex can vigorously resprout after such episodes, its resilience may be subsequently reduced. In the future, higher frequency of return of extreme droughts will challenge thus the capacity of these forests to recover. The insights provided by this review of the complex interplay of processes that determine the response of trees to droughts of different duration, intensity, and frequency will also help us to understand the likely responses of other resprouting angiosperms in seasonally dry ecosystems that share similar functional traits with Q. ilex.

show abstract

Contrasting growth and water use strategies in four co-occurring Mediterranean tree species revealed by concurrent measurements of sap flow and stem diameter variations

Cited by 86 publications

References 58 publications

Growing Season Stem Water Status Assessment of Qinghai Spruce through the Sap Flow and Stem Radial Variations in the Qilian Mountains of China

Growing Season Stem Water Status Assessment of Qinghai Spruce through the Sap Flow and Stem Radial Variations in the Qilian Mountains of China

Drought and irrigation affect transpiration rate and morning tree water status of a mature European beech (Fagus sylvatica L.) forest in Central Europe

Sequence of plant responses to droughts of different timescales: lessons from holm oak (Quercus ilex) forests

Contact Info

Product

Resources

About