Tree Water Status Affects Tree Branch Position

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Forests, Volume 13, issue 5
Physiological processes cause movements of tree stems and branches that occur in a circadian rhythm and over longer time periods, but there is a lack of quantitative understanding of the cause-and-effect relationships. We investigated the movement of tree branches in a long-term drought experiment and at a circadian time scale using time-series of terrestrial laser scanning measurements coupled with measurements of environmental drivers and tree water status. Our results showed that movement of branches was largely explained by leaf water status measured as leaf water potential in a controlled environment for both measured trees (R2 = 0.86 and R2 = 0.75). Our hypothesis is that changes in leaf and branch water status would cause branch movements was further supported by strong relationship between vapor pressure deficit and overnight branch movement (R2 = [0.57–0.74]). Due to lower atmospheric water demand during the nighttime, tree branches settle down as the amount of water in leaves increases. The results indicate that the quantified movement of tree branches could help us to further monitor and understand the water relations of tree communities.
Funding Information: Funding: This research was funded by the Finnish Cultural Foundation and the Academy of Finland (under grant numbers 265949/292757, 295047, 330422, 316096/320075). This study has been done with affiliation to the Academy of Finland Flagship Forest-Human-Machine Interplay—Building Resilience, Redefining Value Networks and Enabling Meaningful Experiences (UNITE) [grant number 337127]. Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// 4.0/).
diurnal branch movement, diurnal cycles, drought, leaf water content, leaf water potential, relative water content, terrestrial laser scanning, tree monitoring, vapour pressure deficit (VPD)
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Junttila, S, Campos, M, Hölttä, T, Lindfors, L, Issaoui, A E, Vastaranta, M, Hyyppä, H & Puttonen, E 2022, ' Tree Water Status Affects Tree Branch Position ', Forests, vol. 13, no. 5, 728 .