Increasing stomatal conductance inresponse to rising atmospheric CO2

C Purcell, Sven Batke, C Yiotis, R Caballero, W.K Soh, M Murray, J McElwain

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Abstract

Background and Aims: Studies have indicated that plant stomatal conductance (gs) decreases in response to elevated atmospheric CO2, a phenomenon of significance for the global hydrological cycle. However, gs increases across certain CO2 ranges have been predicted by optimisation models. The aim of this work was to demonstrate that under certain environmental condition, gs can increase in response to elevated CO2. Methods: When using (i) an extensive, up-to-date, synthesis of gs responses in FACE experiments, (ii) in situ measurements across four biomes showing dynamic gs responses to a CO2 rise of ~50ppm (characterising the change in this greenhouse gas over the past three decades) and (iii) a photosynthesis-stomatal conductance model, it is demonstrated that gs can in some cases increase in response to increasing atmospheric CO2. Key Results: Field observations are corroborated by an extensive synthesis of gs responses in FACE experiments showing that 11.8% of gs responses under experimentally elevated CO2 are positive. They are further supported by a strong data-model fit (r2=0.607) using a stomatal optimization model applied to the field gs dataset. A parameter space identified in the Farquhar-Ball-Berry photosynthesis-stomatal conductance model confirms field observations of increasing gs under elevated CO2 in hot dry conditions. It was shown that contrary to the general assumption, positive gs responses to elevated CO2, although relatively rare, are a feature of woody taxa adapted to warm, low-humidity conditions, and that this response is also demonstrated in global simulations using the Community Land Model (CLM4). Conclusions: The results contradict the over-simplistic notion that global vegetation always responds with decreasing gs to elevated CO2, a finding that has important implications for predicting future vegetation feedbacks on the hydrological cycle at the regional level.
Original languageEnglish
Pages (from-to)1-13
JournalAnnals of Botany
Early online date31 Jan 2018
DOIs
Publication statusE-pub ahead of print - 31 Jan 2018

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stomatal conductance
carbon dioxide
hydrologic cycle
photosynthesis
vegetation
synthesis
greenhouse gases
small fruits
humidity
environmental factors
ecosystems

Keywords

  • Stomata
  • stomatal conductance
  • climatechange
  • CO2
  • hydrology
  • CLM
  • vegetation
  • run-off
  • drought
  • photosynthesis
  • temperature
  • VPD

Cite this

Purcell, C., Batke, S., Yiotis, C., Caballero, R., Soh, W. K., Murray, M., & McElwain, J. (2018). Increasing stomatal conductance inresponse to rising atmospheric CO2. Annals of Botany, 1-13. https://doi.org/10.1093/aob/mcx208
Purcell, C ; Batke, Sven ; Yiotis, C ; Caballero, R ; Soh, W.K ; Murray, M ; McElwain, J. / Increasing stomatal conductance inresponse to rising atmospheric CO2. In: Annals of Botany. 2018 ; pp. 1-13.
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Purcell, C, Batke, S, Yiotis, C, Caballero, R, Soh, WK, Murray, M & McElwain, J 2018, 'Increasing stomatal conductance inresponse to rising atmospheric CO2', Annals of Botany, pp. 1-13. https://doi.org/10.1093/aob/mcx208

Increasing stomatal conductance inresponse to rising atmospheric CO2. / Purcell, C; Batke, Sven; Yiotis, C; Caballero, R; Soh, W.K; Murray, M; McElwain, J.

In: Annals of Botany, 31.01.2018, p. 1-13.

Research output: Contribution to journalArticle

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T1 - Increasing stomatal conductance inresponse to rising atmospheric CO2

AU - Purcell, C

AU - Batke, Sven

AU - Yiotis, C

AU - Caballero, R

AU - Soh, W.K

AU - Murray, M

AU - McElwain, J

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N2 - Background and Aims: Studies have indicated that plant stomatal conductance (gs) decreases in response to elevated atmospheric CO2, a phenomenon of significance for the global hydrological cycle. However, gs increases across certain CO2 ranges have been predicted by optimisation models. The aim of this work was to demonstrate that under certain environmental condition, gs can increase in response to elevated CO2. Methods: When using (i) an extensive, up-to-date, synthesis of gs responses in FACE experiments, (ii) in situ measurements across four biomes showing dynamic gs responses to a CO2 rise of ~50ppm (characterising the change in this greenhouse gas over the past three decades) and (iii) a photosynthesis-stomatal conductance model, it is demonstrated that gs can in some cases increase in response to increasing atmospheric CO2. Key Results: Field observations are corroborated by an extensive synthesis of gs responses in FACE experiments showing that 11.8% of gs responses under experimentally elevated CO2 are positive. They are further supported by a strong data-model fit (r2=0.607) using a stomatal optimization model applied to the field gs dataset. A parameter space identified in the Farquhar-Ball-Berry photosynthesis-stomatal conductance model confirms field observations of increasing gs under elevated CO2 in hot dry conditions. It was shown that contrary to the general assumption, positive gs responses to elevated CO2, although relatively rare, are a feature of woody taxa adapted to warm, low-humidity conditions, and that this response is also demonstrated in global simulations using the Community Land Model (CLM4). Conclusions: The results contradict the over-simplistic notion that global vegetation always responds with decreasing gs to elevated CO2, a finding that has important implications for predicting future vegetation feedbacks on the hydrological cycle at the regional level.

AB - Background and Aims: Studies have indicated that plant stomatal conductance (gs) decreases in response to elevated atmospheric CO2, a phenomenon of significance for the global hydrological cycle. However, gs increases across certain CO2 ranges have been predicted by optimisation models. The aim of this work was to demonstrate that under certain environmental condition, gs can increase in response to elevated CO2. Methods: When using (i) an extensive, up-to-date, synthesis of gs responses in FACE experiments, (ii) in situ measurements across four biomes showing dynamic gs responses to a CO2 rise of ~50ppm (characterising the change in this greenhouse gas over the past three decades) and (iii) a photosynthesis-stomatal conductance model, it is demonstrated that gs can in some cases increase in response to increasing atmospheric CO2. Key Results: Field observations are corroborated by an extensive synthesis of gs responses in FACE experiments showing that 11.8% of gs responses under experimentally elevated CO2 are positive. They are further supported by a strong data-model fit (r2=0.607) using a stomatal optimization model applied to the field gs dataset. A parameter space identified in the Farquhar-Ball-Berry photosynthesis-stomatal conductance model confirms field observations of increasing gs under elevated CO2 in hot dry conditions. It was shown that contrary to the general assumption, positive gs responses to elevated CO2, although relatively rare, are a feature of woody taxa adapted to warm, low-humidity conditions, and that this response is also demonstrated in global simulations using the Community Land Model (CLM4). Conclusions: The results contradict the over-simplistic notion that global vegetation always responds with decreasing gs to elevated CO2, a finding that has important implications for predicting future vegetation feedbacks on the hydrological cycle at the regional level.

KW - Stomata

KW - stomatal conductance

KW - climatechange

KW - CO2

KW - hydrology

KW - CLM

KW - vegetation

KW - run-off

KW - drought

KW - photosynthesis

KW - temperature

KW - VPD

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JF - Annals of Botany

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