Thawing permafrost can mitigate warming-induced drought stress in boreal forest trees

0581727 - ÚVGZ 2025 RIV NL eng J - Článek v odborném periodiku
Kirdyanov, A. - Saurer, M. - Arzac, A. - Knorre, A.A. - Prokushkin, A.S. - Churakova (Sidorova), O. - Arosio, T. - Bebchuk, T. - Siegwolf, R. - Büntgen, Ulf
Thawing permafrost can mitigate warming-induced drought stress in boreal forest trees.
Science of the Total Environment. Roč. 912, FEB (2024), č. článku 168858. ISSN 0048-9697. E-ISSN 1879-1026
Institucionální podpora: RVO:86652079
Klíčová slova: maximum latewood density * root-system development * larix-gmelinii * ring width * siberian larch * northern-hemisphere * carbon isotopes * white spruce * climate * growth * Active soil layer * Boreal forest * Dendrochronology * Global warming * Siberia * Stable isotopes * Tree growth
Obor OECD: Environmental sciences (social aspects to be 5.7)
Impakt faktor: 9.8, rok: 2022
Způsob publikování: Omezený přístup
https://www.sciencedirect.com/science/article/pii/S0048969723074879?via%3Dihub

Perennially frozen soil, also known as permafrost, is important for the functioning and productivity of most of the boreal forest, the world's largest terrestrial biome. A better understanding of complex vegetation-permafrost interrelationships is needed to predict changes in local-to large-scale carbon, nutrient, and water cycle dy-namics under future global warming. Here, we analyze tree-ring width and tree-ring stable isotope (C and O) measurements of Gmelin larch (Larix gmelinii (Rupr.) Rupr.) from six permafrost sites in the northern taiga of central Siberia. Our multi-parameter approach shows that changes in tree growth were predominantly controlled by the air and topsoil temperature and moisture content of the active soil and upper permafrost layers. The observed patterns range from strong growth limitations by early summer temperatures at higher elevations to significant growth controls by precipitation at warmer and well-drained lower-elevation sites. Enhanced radial tree growth is mainly found at sites with fast thawing upper mineral soil layers, and the comparison of tree-ring isotopes over five-year periods with different amounts of summer precipitation indicates that trees can prevent drought stress by accessing water from melted snow and seasonally frozen soil. Identifying the active soil and upper permafrost layers as central water resources for boreal tree growth during dry summers demonstrates the complexity of ecosystem responses to climatic changes.
Trvalý link: https://hdl.handle.net/11104/0353093