Analysis of the NSC Storage Dynamics in Tree Organs Reveals the Allocation to Belowground Symbionts in the Framework of Whole Tree Carbon Balance

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dc.contributor.author Schiestl-Aalto, Pauliina
dc.contributor.author Ryhti, Kira
dc.contributor.author Mäkelä, Annikki
dc.contributor.author Peltoniemi, Mikko
dc.contributor.author Bäck, Jaana
dc.contributor.author Kulmala, Liisa
dc.date.accessioned 2019-06-28T09:37:01Z
dc.date.available 2019-06-28T09:37:01Z
dc.date.issued 2019-05-03
dc.identifier.citation Schiestl-Aalto , P , Ryhti , K , Mäkelä , A , Peltoniemi , M , Bäck , J & Kulmala , L 2019 , ' Analysis of the NSC Storage Dynamics in Tree Organs Reveals the Allocation to Belowground Symbionts in the Framework of Whole Tree Carbon Balance ' , Frontiers in Forests and Global Change , vol. 2 , 17 . https://doi.org/10.3389/ffgc.2019.00017
dc.identifier.other PURE: 124379899
dc.identifier.other PURE UUID: b79bc45e-375a-4e96-8487-1ed0965c4bca
dc.identifier.other ORCID: /0000-0002-6107-667X/work/58950545
dc.identifier.other ORCID: /0000-0001-9633-7350/work/58952552
dc.identifier.other ORCID: /0000-0003-1775-8240/work/58954462
dc.identifier.other ORCID: /0000-0002-9006-5689/work/58958162
dc.identifier.other WOS: 000516820800001
dc.identifier.uri http://hdl.handle.net/10138/303571
dc.description.abstract Photosynthesis is not entirely synchronized with carbon sinks, implying that trees are capable of storing non-structural carbohydrates (NSC), such as soluble sugars and starch. These storages provide a buffer between carbohydrate supply and demand and also allow trees to resist drought through osmoregulation. However, estimates of the total pool size and seasonal dynamics of the NSC storage of mature trees are still rare. Part of NSC is allocated outside roots, mainly to symbiotic, root-associated mycorrhizal fungi. The quantity and dynamics of this allocation are difficult to estimate in field conditions due to the close interaction between the symbionts. The aims of this study were to (1) determine the temporal development of NSC concentrations in tree organs, (2) upscale the storage compounds to whole-tree level and (3) analyse the significance of NSC allocation to belowground symbionts as part of the carbon balance in mature pines in a boreal Scots pine stand in southern Finland. We took samples every 2–4 weeks of needles, fine roots, stem wood, shoot wood and phloem from 1 to 3 trees in 2015. Concentrations of soluble sugars and starch were analyzed from the samples and upscaled to tree level. For quantifying the third aim, we used a whole-tree carbon balance model CASSIA that incorporates daily photosynthesis, respiration and organ-specific growth as functions of environmental factors. In this study, we included the allocation to belowground symbionts as an additional carbon sink and scaled the flux using the NSC pool over the whole tree. We observed that organ-specific NSC concentrations were highest in phloem, needles and fine roots. Total NSC increased in spring, peaked duringmid-summer and decreased again in autumn without any notable decrease during the most intensive growth period at midsummer. In the model analysis, 6% of yearly photosynthesis was allocated to the root-associated symbionts. The study highlights the applicability of the carbon balance approach in evaluating the importance of processes that cannot yet be directly measured. en
dc.format.extent 14
dc.language.iso eng
dc.relation.ispartof Frontiers in Forests and Global Change
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 1172 Environmental sciences
dc.subject 4112 Forestry
dc.title Analysis of the NSC Storage Dynamics in Tree Organs Reveals the Allocation to Belowground Symbionts in the Framework of Whole Tree Carbon Balance en
dc.type Article
dc.contributor.organization Ecosystem processes (INAR Forest Sciences)
dc.contributor.organization Department of Forest Sciences
dc.contributor.organization Institute for Atmospheric and Earth System Research (INAR)
dc.contributor.organization Forest Ecology and Management
dc.contributor.organization Forest Modelling Group
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.3389/ffgc.2019.00017
dc.relation.issn 2624-893X
dc.rights.accesslevel openAccess
dc.type.version publishedVersion
dc.relation.funder Valtion perusrahoitus/hankkeet
dc.relation.grantnumber

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