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Influences of light and humidity on carbonyl sulfide-based estimates of photosynthesis

Kooijmans, Linda M. J.; Sun, Wu; Aalto, Juho; Erkkilä, Kukka-Maaria; Maseyk, Kadmiel; Seibt, Ulrike; Vesala, Timo; Mammarella, Ivan and Chen, Huilin (2019). Influences of light and humidity on carbonyl sulfide-based estimates of photosynthesis. Proceedings of the National Academy of Sciences, 116(7) pp. 2470–2475.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1073/pnas.1807600116
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Abstract

Understanding climate controls on gross primary productivity (GPP) is crucial for accurate projections of the future land carbon cycle. Major uncertainties exist due to the challenge in separating GPP and respiration from observations of the carbon dioxide (CO2) flux. Carbonyl sulfide (COS) has a dominant vegetative sink, and plant COS uptake is used to infer GPP through the leaf relative uptake (LRU) ratio of COS to CO2 fluxes. However, little is known about variations of LRU under changing environmental conditions and in different phenological stages. We present COS and CO2 fluxes and LRU of Scots pine branches measured in a boreal forest in Finland during the spring recovery and summer. We find that the diurnal dynamics of COS uptake is mainly controlled by stomatal conductance, but the leaf internal conductance could significantly limit the COS uptake during the daytime and early in the season. LRU varies with light due to the differential light responses of COS and CO2 uptake, and with vapor pressure deficit (VPD) in the peak growing season, indicating a humidity-induced stomatal control. Our COS-based GPP estimates show that it is essential to incorporate the variability of LRU with environmental variables for accurate estimation of GPP on ecosystem, regional, and global scales.

Item Type: Journal Item
Copyright Holders: 2019 The Authors
ISSN: 0027-8424
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNA13OAR4310082National Oceanic and Atmospheric Administration Climate Program Office
Not Set654182European Union Horizon 2020
Not SetNot SetVilho, Yrjö, and Kalle Väisälä Foundation
Not Set281255Integrated Carbon Observation System-Finland
Not Set307331Academy of Finland Center of Excellence
Keywords: carbonyl sulfide; photosynthesis; stomatal conductance; carbon cycle
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 59047
Depositing User: Kadmiel Maseyk
Date Deposited: 08 Feb 2019 14:08
Last Modified: 30 May 2019 13:45
URI: http://oro.open.ac.uk/id/eprint/59047
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