---
DOAJ_listed: '1'
OA_place: publisher
OA_type: gold
PlanS_conform: '1'
_id: '22447'
abstract:
- lang: eng
  text: "Elevated atmospheric CO2 concentration is expected\r\nto increase leaf CO2
    assimilation rates, thus promoting plant growth\r\nand increasing leaf area. It
    also decreases stomatal conductance, allowing\r\nwater savings, which have been
    hypothesized to drive large-scale greening,\r\nin particular in arid and semiarid
    climates. However, the increase in leaf\r\narea could reduce the benefits of elevated
    CO2 concentration through soil\r\nwater depletion. The net effect of elevated
    CO2 on leaf- and\r\ncanopy-level gas exchange remains uncertain. To address this
    question, we\r\ncompare the outcomes of a heuristic model based on the Partitioning
    of\r\nEquilibrium Transpiration and Assimilation (PETA) hypothesis and three model\r\nvariants
    based on stomatal optimization theory. Predicted relative changes in leaf-\r\nand
    canopy-level gas exchange rates are used as a metric of plant responses\r\nto
    changes in atmospheric CO2 concentration. Both model approaches predict\r\nreductions
    in leaf-level transpiration rate due to decreased stomatal\r\nconductance under
    elevated CO2, but negligible (PETA) or no\r\n(optimization) changes in canopy-level
    transpiration due to the compensatory\r\neffect of increased leaf area. Leaf-
    and canopy-level CO2 assimilation\r\nis predicted to increase, with an amplification
    of the CO2\r\nfertilization effect at the canopy level due to the enhanced leaf
    area. The\r\nexpected increase in vapour pressure deficit (VPD) under warmer conditions
    is\r\ngenerally predicted to decrease the sensitivity of gas exchange to\r\natmospheric
    CO2 concentration in both models. The consistent\r\npredictions by different models
    that canopy-level transpiration varies\r\nlittle under elevated CO2 due to combined
    stomatal conductance\r\nreduction and leaf area increase highlight the coordination
    of\r\nphysiological and morphological characteristics in vegetation to maximize\r\nresource
    use (here water) under altered climatic conditions."
article_processing_charge: No
article_type: original
author:
- first_name: Stefano
  full_name: Manzoni, Stefano
  last_name: Manzoni
- first_name: Simone
  full_name: Fatichi, Simone
  id: cf8e546b-a9b0-11f0-a43b-aa89ed1b56d6
  last_name: Fatichi
- first_name: Xue
  full_name: Feng, Xue
  last_name: Feng
- first_name: Gabriel G.
  full_name: Katul, Gabriel G.
  last_name: Katul
- first_name: Danielle
  full_name: Way, Danielle
  last_name: Way
- first_name: Giulia
  full_name: Vico, Giulia
  last_name: Vico
citation:
  ama: Manzoni S, Fatichi S, Feng X, Katul GG, Way D, Vico G. Consistent responses
    of vegetation gas exchange to elevated atmospheric CO2 emerge from heuristic and
    optimization models. <i>Biogeosciences</i>. 2022;19(17):4387-4414. doi:<a href="https://doi.org/10.5194/bg-19-4387-2022">10.5194/bg-19-4387-2022</a>
  apa: Manzoni, S., Fatichi, S., Feng, X., Katul, G. G., Way, D., &#38; Vico, G. (2022).
    Consistent responses of vegetation gas exchange to elevated atmospheric CO2 emerge
    from heuristic and optimization models. <i>Biogeosciences</i>. Copernicus Publications.
    <a href="https://doi.org/10.5194/bg-19-4387-2022">https://doi.org/10.5194/bg-19-4387-2022</a>
  chicago: Manzoni, Stefano, Simone Fatichi, Xue Feng, Gabriel G. Katul, Danielle
    Way, and Giulia Vico. “Consistent Responses of Vegetation Gas Exchange to Elevated
    Atmospheric CO2 Emerge from Heuristic and Optimization Models.” <i>Biogeosciences</i>.
    Copernicus Publications, 2022. <a href="https://doi.org/10.5194/bg-19-4387-2022">https://doi.org/10.5194/bg-19-4387-2022</a>.
  ieee: S. Manzoni, S. Fatichi, X. Feng, G. G. Katul, D. Way, and G. Vico, “Consistent
    responses of vegetation gas exchange to elevated atmospheric CO2 emerge from heuristic
    and optimization models,” <i>Biogeosciences</i>, vol. 19, no. 17. Copernicus Publications,
    pp. 4387–4414, 2022.
  ista: Manzoni S, Fatichi S, Feng X, Katul GG, Way D, Vico G. 2022. Consistent responses
    of vegetation gas exchange to elevated atmospheric CO2 emerge from heuristic and
    optimization models. Biogeosciences. 19(17), 4387–4414.
  mla: Manzoni, Stefano, et al. “Consistent Responses of Vegetation Gas Exchange to
    Elevated Atmospheric CO2 Emerge from Heuristic and Optimization Models.” <i>Biogeosciences</i>,
    vol. 19, no. 17, Copernicus Publications, 2022, pp. 4387–414, doi:<a href="https://doi.org/10.5194/bg-19-4387-2022">10.5194/bg-19-4387-2022</a>.
  short: S. Manzoni, S. Fatichi, X. Feng, G.G. Katul, D. Way, G. Vico, Biogeosciences
    19 (2022) 4387–4414.
das_tickbox: '1'
date_created: 2026-07-27T12:30:23Z
date_published: 2022-09-14T00:00:00Z
date_updated: 2026-07-30T10:58:52Z
day: '14'
doi: 10.5194/bg-19-4387-2022
extern: '1'
fulldoi: https://doi.org/10.5194/bg-19-4387-2022
intvolume: '        19'
issue: '17'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.5194/bg-19-4387-2022
month: '09'
oa: 1
oa_version: Published Version
page: 4387-4414
publication: Biogeosciences
publication_identifier:
  issn:
  - 1726-4189
publication_status: published
publisher: Copernicus Publications
quality_controlled: '1'
scopus_import: '1'
status: public
title: Consistent responses of vegetation gas exchange to elevated atmospheric CO2
  emerge from heuristic and optimization models
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 19
year: '2022'
...