Disentangling carbon uptake and allocation in the stems of a spruce forest

Krejza, Jan; Haeni, Matthias; Dařenová, Eva; Foltýnová, Lenka; Fajstavr, Marek; Světlík, Jan; Nezval, Ondřej; Bednář, Pavel; Šigut, Ladislav; Horáček, Petr; Zweifel, Roman

doi:10.1016/j.envexpbot.2022.104787

Cited by 25 publications

(18 citation statements)

References 84 publications

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“…(2018) presented that the culmination of radial increment for Norway spruce usually occurs around the beginning-middle of June. Krejza et al. (2022) in a study aimed on carbon uptake and allocation in mature Norway spruce monoculture (located 30 km from our study location), showed the radial growth onset on old Norway spruce in the middle of May (128 DOY), ends in the beginning of September (249 DOY) with the highest rates of daily increment between the second half of May till the beginning of August (139 to 214 DOY), which agrees with our study.…”

Section: Discussionsupporting

confidence: 92%

Sap flow and growth response of Norway spruce under long-term partial rainfall exclusion at low altitude

et al. 2023

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IntroductionUnder ongoing climate change, more frequent and severe drought periods accompanied by heat waves are expected in the future. Under these conditions, the tree’s survival is conditioned by fast recovery of functions after drought release. Therefore, in the presented study, we evaluated the effect of long-term water reduction in soil on tree water use and growth dynamics of Norway spruce.MethodsThe experiment was conducted in two young Norway spruce plots located on suboptimal sites at a low altitude of 440 m a.s.l. In the first plot (PE), 25% of precipitation throughfall was excluded since 2007, and the second one represented the control treatment with ambient conditions (PC). Tree sap flow, stem radial increment, and tree water deficit were monitored in two consecutive growing seasons: 2015-2016, with contrasting hydro-climatic conditions.ResultsTrees in both treatments showed relatively isohydric behavior reflected in a strong reduction of sap flow under the exceptional drought of 2015. Nevertheless, trees from PE treatment reduced sap flow faster than PC under decreasing soil water potential, exhibiting faster stomatal response. This led to a significantly lower sap flow of PE, compared to PC in 2015. The maximal sap flow rates were also lower for PE treatment, compared to PC. Both treatments experienced minimal radial growth during the 2015 drought and subsequent recovery of radial growth under the more the humid year of 2016. However, treatments did not differ significantly in stem radial increments within respective years.DiscussionPrecipitation exclusion treatment, therefore, led to water loss adjustment, but did not affect growth response to intense drought and growth recovery in the year after drought.

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Section: Discussionsupporting

confidence: 92%

Sap flow and growth response of Norway spruce under long-term partial rainfall exclusion at low altitude

et al. 2023

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“…Trees consequently grow mainly at night. Growth processes clearly come to a halt before the onset of stomatal closure (VPD > 0.8 kPa) and the photosynthetic output coupled to it, which was recently confirmed by Krejza et al (2022). However, if the soil water potential sinks too low during a dry period, even high air humidity (low VPD) can no longer initiate growth.…”

Section: Introductionmentioning

confidence: 70%

“…In addition, drought conditions often trigger stomatal down-regulation entailing a rise in leaf temperature due to reduced transpirational cooling (Leuzinger and Körner, 2007;Scherrer et al, 2011). Commonly, drought-related reductions in g s do not (rapidly) result in carbohydrate depletion but often rather in an increase in non-structural carbohydrates due to diminished sink strength since structural sinks are far more sensitive to turgor loss than photosynthesis (Körner, 2019;Krejza et al, 2022). Even under curtailed photosynthate supply, the maintenance of non-structural carbohydrate levels has been shown to take precedence over carbon allocation to growth across a variety of woody species (Weber et al, 2019).…”

Section: Radial Stem Incrementmentioning

confidence: 99%

Less Pronounced Drought Responses in Ring-Porous than in Diffuse-Porous Temperate Tree Species

Bader¹,

Scherrer²,

Zweifel³

et al. 2022

SSRN Journal

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“…lack of considering inter-annual variability of wood anatomy (Björklund et al 2017), which can lead to relevant biases (Cuny et al 2015, Pretzsch et al 2018, Vannoppen et al 2018. Other methods to assess tree growth, such as stem circumference increment (Delpierre et al 2016) and xylogenesis (Krejza et al 2022) monitoring, are more temporally detailed and provide information on intra-annual wood formation processes and phenology, but lack the temporal extent of tree rings necessary to assess how inter-annual variability of C fluxes affects tree radial growth.…”

Section: Introductionmentioning

confidence: 99%

“…When wood anatomical variations are assessed at the intra-ring level, intra-seasonal climate influence on tree radial growth can be retrieved, overcoming the typical annual resolution of TRW analysis (Castagneri et al 2017, Belokopytova et al 2019, Pérez-de-Lis et al 2022. Since both ecosystem productivity and wood formation patterns vary considerably over the growing season, and show different sensitivity to seasonal climate (Deslauriers et al 2017, Xu et al 2020, Krejza et al 2022, long time-series analysis at intra-annual scale could disclose the complex relationships between environmental variability, C fluxes and biomass accumulation in wood which are obscured by annually resolved analyses.…”

Section: Introductionmentioning

confidence: 99%

Revealing how intra- and inter-annual variability of carbon uptake (GPP) affects wood cell biomass in an eastern white pine forest

Puchi

Khomik

Frigo

et al. 2023

Environ. Res. Lett.

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Forests are major terrestrial carbon (C) sinks and play a crucial role in climate change mitigation. Despite extensive studies on forest C sequestration, the relationship between seasonal C uptake and its allocation to woody biomass is poorly understood. Here we used a novel dendro-anatomical approach to investigate the relationships between climate variability, C uptake, and woody biomass growth in an 80-year-old eastern white pine (Pinus strobus) plantation forest in Ontario, Canada. We used eddy covariance Gross Primary Productivity (GPP) from 2003-2018 and woody biomass estimated from chronologies of cell wall area (CWA, a proxy for C storage in individual wood cells) and ring wall area (RWA) for earlywood and latewood from 1970-2018. Warm temperatures in early spring and high precipitation in mid-spring and summer positively and strongly affected GPP, while high temperature and high VPD in the summer had a negative effect. From 2003 to 2018, there was a steady increase in both GPP and woody cell biomass. Moreover, we found strong positive correlations between GPP and CWA both in earlywood (May – July GPP, r = 0.65) and latewood (July – August GPP, r = 0.89). Strong positive correlations were also found between GPP and RWA both in earlywood and latewood (April – September, r = ≥ 0.79). All these associations were stronger than the association between annual GPP and tree-ring width (r = 0.61) used in previous studies. By increasing the resolution of tree-ring analysis to xylem-cell level, we captured intra-annual variability in biomass accumulation. We demonstrated a strong control of seasonal C assimilation (source) over C accumulation in woody biomass at this site. Coupling high-resolution eddy covariance fluxes (GPP) and wood anatomical measurements can help to reduce existing uncertainties on C source-sink relationships, opening new perspectives in the study of the C cycle in forests.

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Disentangling carbon uptake and allocation in the stems of a spruce forest

Cited by 25 publications

References 84 publications

Sap flow and growth response of Norway spruce under long-term partial rainfall exclusion at low altitude

Sap flow and growth response of Norway spruce under long-term partial rainfall exclusion at low altitude

Less Pronounced Drought Responses in Ring-Porous than in Diffuse-Porous Temperate Tree Species

Revealing how intra- and inter-annual variability of carbon uptake (GPP) affects wood cell biomass in an eastern white pine forest

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