Tree organ growth and carbon allocation dynamics impact the magnitude and δ13C signal of stem and soil CO2 fluxes

Autor:	Yu Tang, Pauliina Schiestl-Aalto, Matthias Saurer, Elina Sahlstedt, Liisa Kulmala, Pasi Kolari, Kira Ryhti, Yann Salmon, Tuula Jyske, Yiyang Ding, Jaana Bäck, Katja T Rinne-Garmston
Přispěvatelé:	Ecosystem processes (INAR Forest Sciences), Institute for Atmospheric and Earth System Research (INAR), Department of Forest Sciences, Micrometeorology and biogeochemical cycles, Viikki Plant Science Centre (ViPS), Forest Soil Science and Biogeochemistry, Department of Microbiology, Forest Ecology and Management
Rok vydání:	2022
Předmět:	compound-specific Physiology Carbohydrates Plant Science Forests Trees DIOXIDE EFFLUX Soil SUMMER DROUGHT ISOTOPE DISCRIMINATION PHLOEM boreal forest PINUS-SYLVESTRIS SEEDLINGS SCOTS PINE water-soluble carbohydrates (WSCs) 4112 Forestry starch 1184 Genetics developmental biology physiology NORWAY SPRUCE Pinus sylvestris sucrose 11831 Plant biology Carbon LARCH TREES RESPIRATION ELEVATED CO2 non-structural carbohydrates (NSCs)
Zdroj:	Tree Physiology
ISSN:	1758-4469
Popis:	Incomplete knowledge of carbon (C) allocation dynamics in trees hinders accurate modeling and future predictions of tree growth. We studied C allocation dynamics in a mature Pinus sylvestris L. dominated forest with a novel analytical approach, allowing the first comparison of: (i) magnitude and delta C-13 of shoot, stem and soil CO2 fluxes (A(shoot), R-stem and R-soil), (ii) concentration and delta C-13 of compound-specific and/or bulk non-structural carbohydrates (NSCs) in phloem and roots and (iii) growth of stem and fine roots. Results showed a significant effect of phloem NSC concentrations on tracheid growth, and both variables significantly impacted R-stem. Also, concentrations of root NSCs, especially starch, had a significant effect on fine root growth, although no effect of root NSC concentrations or root growth was detected on R-soil. Time series analysis between delta C-13 of A(shoot) and delta C-13 of R-stem or delta C-13 of R-soil revealed strengthened C allocation to stem or roots under high C demands. Furthermore, we detected a significant correlation between delta C-13 of R-stem and delta C-13 of phloem sucrose and glucose, but not for starch or water-soluble carbohydrates. Our results indicate the need to include C allocation dynamics into tree growth models. We recommend using compound-specific concentration and delta C-13 analysis to reveal C allocation processes that may not be detected by the conventional approach that utilizes bulk organic matter.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9bff1a7438740fcdebd00b2ed3aaa603 https://doi.org/10.1093/treephys/tpac079 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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