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

0555989 - ÚVGZ 2023 RIV NL eng J - Článek v odborném periodiku
Krejza, Jan - Haeni, M. - Dařenová, Eva - Foltýnová, Lenka - Fajstavr, Marek - Světlík, Jan - Nezval, Ondřej - Bednář, P. - Šigut, Ladislav - Horáček, Petr - Zweifel, R.
Disentangling carbon uptake and allocation in the stems of a spruce forest.
Environmental and Experimental Botany. Roč. 196, APR (2022), č. článku 104787. ISSN 0098-8472. E-ISSN 1873-7307
Grant CEP: GA TA ČR(CZ) TJ01000309; GA MŠMT(CZ) EF16_019/0000797; GA TA ČR(CZ) TO01000345; GA MŠMT(CZ) LM2018123
Institucionální podpora: RVO:86652079
Klíčová slova: net ecosystem exchange * tree water-deficit * norway spruce * sonic anemometer * summer drought * radius changes * climate-change * conifer tree * root-system * growth * Carbon balance * Stem radial increment * Drought stress * Carbon flux * Picea abies * Partitioning * Xylogenesis * Wood formation * Dendrometer * Eddy covariance * Forest inventory * Tree ring
Obor OECD: Environmental sciences (social aspects to be 5.7)
Impakt faktor: 5.7, rok: 2022
Způsob publikování: Open access
https://www.sciencedirect.com/science/article/pii/S0098847222000090

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.
Trvalý link: http://hdl.handle.net/11104/0330436