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

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

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  • NSTL
  • Elsevier
Although forests store significant amounts of carbon in tree stems, the extent to which stem growth depends on carbon assimilation and environmental factors is poorly understood. In this study, gross primary productivity (GPP) and net ecosystem productivity (NEP) are compared for the first time at daily resolution with stem carbon allocation (SCA) in a spruce forest. We found substantial differences in the seasonal patterns of all variables as a function of environmental conditions, leading to three important findings. First, carbon uptake was only marginally invested in wood growth during the first half of the growing season. This means that there were other priorities for carbon allocation than stem growth at this time of year. Second, our results show that SRI at the beginning of the stem growth period, which mainly involves cell division and expansion, is a process that requires less carbon than the process of xylem lignification and thickening that follows. And third, NEP was generally less sensitive to drought than SCA. This suggests that the carbon uptake balance is less sensitive to dry periods than growth, particularly because the carbon uptake period is much longer than the growth window. These results may change the way we perceive the effects of climate change on forests, as tree carbon dynamics are primarily explained by the seasonal timing of dry periods rather than the intensity of these events.

Carbon balanceStem radial incrementDrought stressCarbon fluxPicea abiesPartitioningXylogenesisWood formationDendrometerEddy covarianceForest inventoryTree ringNET ECOSYSTEM EXCHANGETREE WATER-DEFICITNORWAY SPRUCESONIC ANEMOMETERSUMMER DROUGHTRADIUS CHANGESCLIMATE-CHANGECONIFER TREEROOT-SYSTEMGROWTH

Krejza, Jan、Haeni, Matthias、Darenova, Eva、Foltynovova, Lenka、Fajstavr, Marek、Sve, Jan、Nezval, Ondrej、Bednar, Pavel、Sigut, Ladislav、Horacek, Petr、Zweifel, Roman

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CAS

Swiss Fed Inst Forest

Forestry & Game Management Res Inst

2022

10.1016/j.envexpbot.2022.104787

Environmental and experimental botany

Environmental and experimental botany

SCI
ISSN：0098-8472
年,卷(期)：2022.196
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