scholarly journals Hot drought reduces the effects of elevated CO 2 on tree water‐use efficiency and carbon metabolism

2020 ◽  
Vol 226 (6) ◽  
pp. 1607-1621 ◽  
Author(s):  
Benjamin Birami ◽  
Thomas Nägele ◽  
Marielle Gattmann ◽  
Yakir Preisler ◽  
Andreas Gast ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Carbon Metabolism ◽  
Tree Water Use ◽  
Use Efficiency

Effects of climate change on tree water use efficiency, nitrogen availability and growth in boreal forest of northern China

2020 ◽  
Vol 20 (10) ◽  
pp. 3607-3614
Author(s):  
Amal Succarie ◽  
Zhihong Xu ◽  
Wenjie Wang ◽  
Tengjiao Liu ◽  
Xiting Zhang ◽  
...  
Keyword(s):  
Climate Change ◽  
Boreal Forest ◽  
Water Use Efficiency ◽  
Water Use ◽  
Nitrogen Availability ◽  
Northern China ◽  
Tree Water Use ◽  
Use Efficiency

scholarly journals Paludification reduces black spruce growth rate but does not alter tree water use efficiency in Canadian boreal forested peatlands

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Joannie Beaulne ◽  
Étienne Boucher ◽  
Michelle Garneau ◽  
Gabriel Magnan
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Tree Ring ◽  
Water Table ◽  
Black Spruce ◽  
Forest Growth ◽  
Peat Accumulation ◽  
Tree Water Use ◽  
Growth Decline ◽  
Use Efficiency

Abstract Background Black spruce (Picea mariana (Mill.) BSP)-forested peatlands are widespread ecosystems in boreal North America in which peat accumulation, known as the paludification process, has been shown to induce forest growth decline. The continuously evolving environmental conditions (e.g., water table rise, increasing peat thickness) in paludified forests may require tree growth mechanism adjustments over time. In this study, we investigate tree ecophysiological mechanisms along a paludification gradient in a boreal forested peatland of eastern Canada by combining peat-based and tree-ring analyses. Carbon and oxygen stable isotopes in tree rings are used to document changes in carbon assimilation rates, stomatal conductance, and water use efficiency. In addition, paleohydrological analyses are performed to evaluate the dynamical ecophysiological adjustments of black spruce trees to site-specific water table variations. Results Increasing peat accumulation considerably impacts forest growth, but no significant differences in tree water use efficiency (iWUE) are found between the study sites. Tree-ring isotopic analysis indicates no iWUE decrease over the last 100 years, but rather an important increase at each site up to the 1980s, before iWUE stabilized. Surprisingly, inferred basal area increments do not reflect such trends. Therefore, iWUE variations do not reflect tree ecophysiological adjustments required by changes in growing conditions. Local water table variations induce no changes in ecophysiological mechanisms, but a synchronous shift in iWUE is observed at all sites in the mid-1980s. Conclusions Our study shows that paludification induces black spruce growth decline without altering tree water use efficiency in boreal forested peatlands. These findings highlight that failing to account for paludification-related carbon use and allocation could result in the overestimation of aboveground biomass production in paludified sites. Further research on carbon allocation strategies is of utmost importance to understand the carbon sink capacity of these widespread ecosystems in the context of climate change, and to make appropriate forest management decisions in the boreal biome.

scholarly journals Land‐use legacies influence tree water‐use efficiency and nitrogen availability in recently established European forests

2021 ◽  
Author(s):  
Rossella Guerrieri ◽  
Marta Correia ◽  
Irene Martín‐Forés ◽  
Raquel Alfaro‐Sánchez ◽  
Joan Pino ◽  
...  
Keyword(s):  
Land Use ◽  
Water Use Efficiency ◽  
Water Use ◽  
Nitrogen Availability ◽  
European Forests ◽  
Tree Water Use ◽  
Use Efficiency ◽  
Land Use Legacies

scholarly journals Paludification reduces black spruce growth rate but does not alter tree water use efficiency in Canadian boreal forested peatlands

2021 ◽  
Author(s):  
Joannie Beaulne ◽  
Étienne Boucher ◽  
Michelle Garneau ◽  
Gabriel Magnan
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Water Table ◽  
Black Spruce ◽  
Carbon Assimilation ◽  
Forest Growth ◽  
Peat Accumulation ◽  
Tree Water Use ◽  
Growth Decline ◽  
Use Efficiency

Abstract Background: Black spruce (Picea mariana (Mill.) BSP)-forested peatlands are widespread ecosystems in boreal North America in which peat accumulation, known as the paludification process, has been shown to induce forest growth decline. However, the ecophysiological mechanisms that lead to growth reductions in black spruce remain unexplored. Trees growing in paludified forests have to deal with continuously evolving environmental conditions (e.g., water table rise, increasing peat thickness) that may require growth mechanism adjustments over time. In this study, we investigated tree ecophysiological mechanisms along a paludification gradient in a boreal forested peatland of eastern Canada by combining peat-based and tree-ring analyses. Carbon and oxygen stable isotopes in tree rings were used to document changes in carbon assimilation rates, stomatal conductance, and water use efficiency. In addition, paleohydrological analyses were performed to evaluate the dynamical ecophysiological adjustments of black spruce trees to site-specific water table variations.Results: Increasing peat accumulation considerably impacted forest growth, but no significant differences in tree water use efficiency (iWUE) were observed between the study sites. Tree-ring isotopic analysis indicates no iWUE decrease over the last 100 years, but rather an important increase at each site up to the 1980s, before iWUE stabilized. Surprisingly, inferred basal area increments did not reflect such trends. Our results suggest that the slower growth rates observed at the most paludified sites are attributable, at least partially, to both lower carbon assimilation rates and stomatal conductance. These findings show that iWUE variations do not necessarily reflect tree ecophysiological adjustments required by changes in growing conditions. Local water table variations induced no changes in ecophysiological mechanisms, but the synchronous shift in iWUE observed at all sites in the mid-1980s suggests a tree response to regional or global factors, such as increasing atmospheric CO2 concentration.Conclusions: Our study shows that paludification induces black spruce growth decline without, however, altering tree water use efficiency in boreal forested peatlands. This is the first attempt in exploring the complex interactions between stem growth, ecophysiological mechanisms, and environmental conditions in paludified sites. Additional research on carbon allocation strategies is of utmost importance to understand the carbon sink capacity of these widespread ecosystems and better predict their response to future climate change.

scholarly journals Effects of water deficits on whole tree water use efficiency of orange

2014 ◽  
Vol 140 ◽  
pp. 61-68 ◽  
Author(s):  
Giancarlo Roccuzzo ◽  
Francisco J. Villalobos ◽  
Luca Testi ◽  
Elías Fereres
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Water Deficits ◽  
Tree Water Use ◽  
Use Efficiency ◽  
Whole Tree
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