Limited vertical CO2 transport in stems of mature boreal Pinus sylvestris trees

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http://hdl.handle.net/10138/340712

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Tarvainen , L , Wallin , G , Linder , S , Nasholm , T , Oren , R , Lofvenius , M O , Rantfors , M , Tor-Ngern , P & Marshall , J D 2021 , ' Limited vertical CO2 transport in stems of mature boreal Pinus sylvestris trees ' , Tree Physiology , vol. 41 , no. 1 , pp. 63-75 . https://doi.org/10.1093/treephys/tpaa113

Title: Limited vertical CO2 transport in stems of mature boreal Pinus sylvestris trees
Author: Tarvainen, Lasse; Wallin, Goran; Linder, Sune; Nasholm, Torgny; Oren, Ram; Lofvenius, Mikaell Ottosson; Rantfors, Mats; Tor-Ngern, Pantana; Marshall, John D.
Contributor organization: Department of Forest Sciences
Date: 2021-01
Language: eng
Number of pages: 13
Belongs to series: Tree Physiology
ISSN: 0829-318X
DOI: https://doi.org/10.1093/treephys/tpaa113
URI: http://hdl.handle.net/10138/340712
Abstract: Several studies have suggested that CO2 transport in the transpiration stream can considerably bias estimates of root and stem respiration in ring-porous and diffuse-porous tree species. Whether this also happens in species with tracheid xylem anatomy and lower sap flow rates, such as conifers, is currently unclear. We infused C-13-labelled solution into the xylem near the base of two 90-year-old Pinus sylvestris L. trees. A custom-built gas exchange system and an online isotopic analyser were used to sample the CO2 efflux and its isotopic composition continuously from four positions along the bole and one upper canopy shoot in each tree. Phloem and needle tissue C-13 enrichment was also evaluated at these positions. Most of the C-13 label was lost by diffusion within a few metres of the infusion point indicating rapid CO2 loss during vertical xylem transport. No C-13 enrichment was detected in the upper bole needle tissues. Furthermore, mass balance calculations showed that c. 97% of the locally respired CO2 diffused radially to the atmosphere. Our results support the notion that xylem CO2 transport is of limited magnitude in conifers. This implies that the concerns that stem transport of CO2 derived from root respiration biases chamber-based estimates of forest carbon cycling may be unwarranted for mature conifer stands.
Subject: C-13
carbon allocation
pH
respiration
Scots pine
stable isotope
stem CO2 efflux
xylem transport
CARBON-DIOXIDE
XYLEM SAP
NORWAY SPRUCE
STOMATAL CONDUCTANCE
SEASONAL-VARIATIONS
DAYTIME DEPRESSION
FLUX COMPONENTS
EXTERNAL FLUXES
RESPIRED CO2
EFFLUX
4112 Forestry
Peer reviewed: Yes
Rights: unspecified
Usage restriction: openAccess
Self-archived version: acceptedVersion


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