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

Linda M.J. Kooijmans*, Wu Sun, Juho Aalto, Kukka Maaria Erkkilä, Kadmiel Maseyk, Ulrike Seibt, Timo Vesala, Ivan Mammarella, Huilin Chen

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

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 (CO 2 ) 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 CO 2 fluxes. However, little is known about variations of LRU under changing environmental conditions and in different phenological stages. We present COS and CO 2 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 CO 2 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.

Original languageEnglish
Pages (from-to)2470-2475
JournalProceedings of the National Academy of Sciences of the United States of America
Volume116
Issue number7
DOIs
Publication statusPublished - 12 Feb 2019

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Photosynthesis
Humidity
Light
Carbon Monoxide
Air Conditioning
Vapor Pressure
Carbon Cycle
carbonyl sulfide
Finland
Carbon Dioxide
Uncertainty
Ecosystem
Respiration

Keywords

  • Carbon cycle
  • Carbonyl sulfide
  • Photosynthesis
  • Stomatal conductance

Cite this

Kooijmans, Linda M.J. ; Sun, Wu ; Aalto, Juho ; Erkkilä, Kukka Maaria ; Maseyk, Kadmiel ; Seibt, Ulrike ; Vesala, Timo ; Mammarella, Ivan ; Chen, Huilin. / Influences of light and humidity on carbonyl sulfide-based estimates of photosynthesis. In: Proceedings of the National Academy of Sciences of the United States of America. 2019 ; Vol. 116, No. 7. pp. 2470-2475.
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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 (CO 2 ) 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 CO 2 fluxes. However, little is known about variations of LRU under changing environmental conditions and in different phenological stages. We present COS and CO 2 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 CO 2 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.",
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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; Chen, Huilin.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 116, No. 7, 12.02.2019, p. 2470-2475.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Influences of light and humidity on carbonyl sulfide-based estimates of photosynthesis

AU - Kooijmans, Linda M.J.

AU - Sun, Wu

AU - Aalto, Juho

AU - Erkkilä, Kukka Maaria

AU - Maseyk, Kadmiel

AU - Seibt, Ulrike

AU - Vesala, Timo

AU - Mammarella, Ivan

AU - Chen, Huilin

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N2 - 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 (CO 2 ) 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 CO 2 fluxes. However, little is known about variations of LRU under changing environmental conditions and in different phenological stages. We present COS and CO 2 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 CO 2 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.

AB - 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 (CO 2 ) 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 CO 2 fluxes. However, little is known about variations of LRU under changing environmental conditions and in different phenological stages. We present COS and CO 2 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 CO 2 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.

KW - Carbon cycle

KW - Carbonyl sulfide

KW - Photosynthesis

KW - Stomatal conductance

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