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Estimating canopy gross primary production by combining phloem stable isotopes with canopy and mesophyll conductances

Vernay, Antoine and Tian, Xianglin and Chi, Jinshu and Linder, Sune and Makela, Annikki and Oren, Ram and Peichl, Matthias and Stangl, Zsofia Réka and Tor-Ngern, Pantana and Marshall, John D (2020). Estimating canopy gross primary production by combining phloem stable isotopes with canopy and mesophyll conductances. Plant, Cell and Environment. 43 , 2124-2142
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Abstract

Gross primary production (GPP) is a key component of the forest carbon cycle. However, our knowledge of GPP at the stand scale remains uncertain, because estimates derived from eddy covariance (EC) rely on semi-empirical modelling and the assumptions of the EC technique are sometimes not fully met. We propose using the sap flux/isotope method as an alternative way to estimate canopy GPP, termed GPP(iso/SF), at the stand scale and at daily resolution. It is based on canopy conductance inferred from sap flux and intrinsic water-use efficiency estimated from the stable carbon isotope composition of phloem contents. The GPP(iso/SF)estimate was further corrected for seasonal variations in photosynthetic capacity and mesophyll conductance. We compared our estimate of GPP(iso/SF)to the GPP derived from PRELES, a model parameterized with EC data. The comparisons were performed in a highly instrumented, boreal Scots pine forest in northern Sweden, including a nitrogen fertilized and a reference plot. The resulting annual and daily GPP(iso/SF)estimates agreed well with PRELES, in the fertilized plot and the reference plot. We discuss the GPP(iso/SF)method as an alternative which can be widely applied without terrain restrictions, where the assumptions of EC are not met.

Authors/Creators:Vernay, Antoine and Tian, Xianglin and Chi, Jinshu and Linder, Sune and Makela, Annikki and Oren, Ram and Peichl, Matthias and Stangl, Zsofia Réka and Tor-Ngern, Pantana and Marshall, John D
Title:Estimating canopy gross primary production by combining phloem stable isotopes with canopy and mesophyll conductances
Year of publishing :2020
Volume:43
Page range:2124-2142
Number of Pages:19
ISSN:0140-7791
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:boreal forest, intrinsic water-use efficiency, mesophyll conductance, nitrogen fertilization, phloem delta C-13, PRELES, sap flux, stand transpiration
URN:NBN:urn:nbn:se:slu:epsilon-p-106977
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-106977
Additional ID:
Type of IDID
DOI10.1111/pce.13835
Web of Science (WoS)000551855300001
ID Code:17625
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
(S) > Southern Swedish Forest Research Centre
Deposited By: SLUpub Connector
Deposited On:29 Sep 2020 12:00
Metadata Last Modified:29 Sep 2020 12:01

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