Are chlorophyll concentrations and nitrogen across the vertical canopy profile affected by elevated CO2 in mature Quercus trees?

A. Gardner; D. S. Ellsworth; J. Pritchard; A. R. Mackenzie

doi:10.1007/s00468-022-02328-7

Are chlorophyll concentrations and nitrogen across the vertical canopy profile affected by elevated CO2 in mature Quercus trees?

A. Gardner, D. S. Ellsworth, J. Pritchard, A. R. Mackenzie

Research output: Contribution to journal › Article › peer-review

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Abstract

Key message
In mature Q. robur, chlorophyll varied with season and canopy height, whilst eCO 2 -driven changes were consistent with M area, highlighting key factors for consideration when scaling photosynthetic processes and canopy N-use.

Nitrogen-rich chlorophyll and carotenoid pigments are important in photosynthetic functioning. Photosynthetic pigments have been found to decrease with elevated CO2 (eCO2), but few such studies have been done in aged forest trees. This study aimed to assess the effects of eCO2 (150 μmol mol−1 above ambient) and canopy position on chlorophyll content in mature Quercus robur (Q. robur). Over 5000 in situ chlorophyll absorbance measurements, alongside laboratory chlorophyll extractions, were collected on canopy-dominant Q. robur in the 3rd and 4th season of CO2 fumigation of a free-air CO2 enrichment (FACE) study in central England. Mass-based chlorophyll concentration (Chlmass, mg g−1) was significantly higher in the lower canopy compared to upper canopy foliage (P

Original language	English
Journal	Trees
Early online date	14 Jul 2022
DOIs	https://doi.org/10.1007/s00468-022-02328-7
Publication status	Published - 14 Jul 2022

Bibliographical note

Funding Information:
AG is funded by the John Horseman trust. The BIFoR FACE facility is supported by the JABBS foundation, the University of Birmingham, the John Horseman Trust, the Ecological Continuity Trust, and private donations. ARMK acknowledges support from the U.K. Natural Environment Research Council through grant (NE/S015833/1) which also facilitated DSE’s participation.

Funding Information:
We gratefully acknowledge Professor Richard J. Norby for the useful comments and discussion on an earlier version of the manuscript. We thank Professor Christine Foyer and Dr Barbara Karpinski for laboratory space and advice regarding chlorophyll extractions. AG gratefully thanks Dr Angeliki Kourmouli for assistance during chlorophyll extractions. We thank the BIFoR technical team for canopy access, provision of correlative data, and site operations. AG gratefully acknowledges funding by the John Horseman trust. The BIFoR FACE facility is supported by the JABBS foundation, the University of Birmingham, the John Horseman Trust, the Ecological Continuity Trust, and private donations. ARMK acknowledges support from the U.K. Natural Environment Research Council through grant (NE/S015833/1) which also facilitated DSE’s participation.

Publisher Copyright:
© 2022, The Author(s).

Keywords

Leaf absorbance
Free air CO2 enrichment (FACE)
Photosynthetic pigment
SPAD meter
Temperate deciduous forest

Access to Document

10.1007/s00468-022-02328-7Licence: Creative Commons: Attribution (CC BY)

s00468-022-02328-7Final published version, 1.98 MBLicence: Creative Commons: Attribution (CC BY)

https://link.springer.com/10.1007/s00468-022-02328-7

Quinquennial (half-decadal) carbon and nutrient dynamics in temperate forests: Implications for carbon sequestration in a high carbon dioxide world
Ullah, S., Shi, Z., MacKenzie, R. & Mayoral, C.
Natural Environment Research Council
28/10/19 → 27/10/24
Project: Research Councils

Cite this

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title = "Are chlorophyll concentrations and nitrogen across the vertical canopy profile affected by elevated CO2 in mature Quercus trees?",

abstract = "Key messageIn mature Q. robur, chlorophyll varied with season and canopy height, whilst eCO 2 -driven changes were consistent with M area, highlighting key factors for consideration when scaling photosynthetic processes and canopy N-use.Nitrogen-rich chlorophyll and carotenoid pigments are important in photosynthetic functioning. Photosynthetic pigments have been found to decrease with elevated CO2 (eCO2), but few such studies have been done in aged forest trees. This study aimed to assess the effects of eCO2 (150 μmol mol−1 above ambient) and canopy position on chlorophyll content in mature Quercus robur (Q. robur). Over 5000 in situ chlorophyll absorbance measurements, alongside laboratory chlorophyll extractions, were collected on canopy-dominant Q. robur in the 3rd and 4th season of CO2 fumigation of a free-air CO2 enrichment (FACE) study in central England. Mass-based chlorophyll concentration (Chlmass, mg g−1) was significantly higher in the lower canopy compared to upper canopy foliage (P ",

keywords = "Leaf absorbance, Free air CO2 enrichment (FACE), Photosynthetic pigment, SPAD meter, Temperate deciduous forest",

author = "A. Gardner and Ellsworth, {D. S.} and J. Pritchard and Mackenzie, {A. R.}",

note = "Funding Information: AG is funded by the John Horseman trust. The BIFoR FACE facility is supported by the JABBS foundation, the University of Birmingham, the John Horseman Trust, the Ecological Continuity Trust, and private donations. ARMK acknowledges support from the U.K. Natural Environment Research Council through grant (NE/S015833/1) which also facilitated DSE{\textquoteright}s participation. Funding Information: We gratefully acknowledge Professor Richard J. Norby for the useful comments and discussion on an earlier version of the manuscript. We thank Professor Christine Foyer and Dr Barbara Karpinski for laboratory space and advice regarding chlorophyll extractions. AG gratefully thanks Dr Angeliki Kourmouli for assistance during chlorophyll extractions. We thank the BIFoR technical team for canopy access, provision of correlative data, and site operations. AG gratefully acknowledges funding by the John Horseman trust. The BIFoR FACE facility is supported by the JABBS foundation, the University of Birmingham, the John Horseman Trust, the Ecological Continuity Trust, and private donations. ARMK acknowledges support from the U.K. Natural Environment Research Council through grant (NE/S015833/1) which also facilitated DSE{\textquoteright}s participation. Publisher Copyright: {\textcopyright} 2022, The Author(s).",

year = "2022",

month = jul,

day = "14",

doi = "10.1007/s00468-022-02328-7",

language = "English",

journal = "Trees",