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

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http://hdl.handle.net/10138/318584

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Vernay , A , Tian , X , Chi , J , Linder , S , Makela , A , Oren , R , Peichl , M , Stangl , Z R , Tor-Ngern , P & Marshall , J D 2020 , ' Estimating canopy gross primary production by combining phloem stable isotopes with canopy and mesophyll conductances ' , Plant, Cell and Environment , vol. 43 , no. 9 , pp. 2124-2142 . https://doi.org/10.1111/pce.13835

Title: Estimating canopy gross primary production by combining phloem stable isotopes with canopy and mesophyll conductances
Author: Vernay, Antoine; Tian, Xianglin; Chi, Jinshu; Linder, Sune; Makela, Annikki; Oren, Ram; Peichl, Matthias; Stangl, Zsofia R.; Tor-Ngern, Pantana; Marshall, John D.
Contributor: University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
Date: 2020-09
Language: eng
Number of pages: 19
Belongs to series: Plant, Cell and Environment
ISSN: 0140-7791
URI: http://hdl.handle.net/10138/318584
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.
Subject: boreal forest
intrinsic water-use efficiency
mesophyll conductance
nitrogen fertilization
phloem delta C-13
PRELES
sap flux
stand transpiration
WATER-USE EFFICIENCY
EDDY COVARIANCE TECHNIQUE
CARBON-DIOXIDE EXCHANGE
SAP FLOW MEASUREMENT
STOMATAL CONDUCTANCE
SCOTS PINE
SOIL-WATER
LEAF-AREA
PHOTOSYNTHETIC CAPACITY
TEMPERATURE RESPONSE
11831 Plant biology
4112 Forestry
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