Acclimation of leaf respiration consistent with optimal photosynthetic capacity

Wang, Han; Atkin, Owen K.; Keenan, Trevor F.; Smith, Nicholas G.; Wright, Ian J.; Bloomfield, Keith J.; Kattge, Jens; Reich, Peter B.; Prentice, Iain Colin

doi:10.1111/gcb.14980

Cited by 71 publications

(143 citation statements)

References 69 publications

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“…This has been shown comprehensively in leaves, and is likely to apply to all plant tissues 1 . Moreover, the ratio of respiration to carboxylation capacity, assessed at growth temperature, is slightly but significantly larger in colder climates 46 .…”

Section: Discussionmentioning

confidence: 90%

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Forest production efficiency increases with growth temperature

et al. 2020

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Forest production efficiency (FPE) metric describes how efficiently the assimilated carbon is partitioned into plants organs (biomass production, BP) or—more generally—for the production of organic matter (net primary production, NPP). We present a global analysis of the relationship of FPE to stand-age and climate, based on a large compilation of data on gross primary production and either BP or NPP. FPE is important for both forest production and atmospheric carbon dioxide uptake. We find that FPE increases with absolute latitude, precipitation and (all else equal) with temperature. Earlier findings—FPE declining with age—are also supported by this analysis. However, the temperature effect is opposite to what would be expected based on the short-term physiological response of respiration rates to temperature, implying a top-down regulation of carbon loss, perhaps reflecting the higher carbon costs of nutrient acquisition in colder climates. Current ecosystem models do not reproduce this phenomenon. They consistently predict lower FPE in warmer climates, and are therefore likely to overestimate carbon losses in a warming climate.

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Section: Discussionmentioning

confidence: 90%

“… 45 ). One consequence of these processes is that observed rates of maintenance respiration vary with temperature (in both space and time) far less steeply than would be expected based on the instantaneous response of enzyme kinetics 46 . This has been shown comprehensively in leaves, and is likely to apply to all plant tissues 1 .…”

Section: Discussionmentioning

confidence: 99%

Forest production efficiency increases with growth temperature

et al. 2020

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“…(2001):

{Vc}_{truemax} = false(A_{sat} - R_{d} false) \cdot \frac{C_{normali} + K_{normalm}}{C_{normali} + {normalΓ}^{*}}

{Vc}_{max_std} = {Vc}_{truemax} / \exp (\frac{65 330 \cdot ()(, T_{L} - 25)}{R \cdot T_{L} \cdot 25})

R_{normald} = \exp (\frac{46 390 \cdot ()(, T_{L} - 25)}{R \cdot T_{L} \cdot 25})

where R d is the dark respiration (μmol m −2 s −1 ), Γ * and K m are C i ‐based estimates (μmol mol –1 ) of the photorespiratory compensation point and the effective Michaelis–Menten coefficient of Rubisco respectively, and R is the universal gas constant (J mol −1 K −1 ). Dark respiration at 25°C was set equal to 0.015 Vc max at 25°C based on global‐scale analyses (Atkin et al ., 2015; Smith & Dukes, 2018; Wang et al ., 2020).…”

Section: Methodsmentioning

confidence: 99%

When and where soil is important to modify the carbon and water economy of leaves

et al. 2020

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Summary Photosynthetic ‘least‐cost’ theory posits that the optimal trait combination for a given environment is that where the summed costs of photosynthetic water and nutrient acquisition/use are minimised. The effects of soil water and nutrient availability on photosynthesis should be stronger as climate‐related costs for both resources increase. Two independent datasets of photosynthetic traits, Globamax (1509 species, 288 sites) and Glob13C (3645 species, 594 sites), were used to quantify biophysical and biochemical limitations of photosynthesis and the key variable Ci/Ca (CO2 drawdown during photosynthesis). Climate and soil variables were associated with both datasets. The biochemical photosynthetic capacity was higher on alkaline soils. This effect was strongest at more arid sites, where water unit‐costs are presumably higher. Higher values of soil silt and depth increased Ci/Ca, likely by providing greater H2O supply, alleviating biophysical photosynthetic limitation when soil water is scarce. Climate is important in controlling the optimal balance of H2O and N costs for photosynthesis, but soil properties change these costs, both directly and indirectly. In total, soil properties modify the climate‐demand driven predictions of Ci/Ca by up to 30% at a global scale.

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Section: Discussionmentioning

confidence: 90%

“…43 ). One consequence of these processes is that observed rates of respiration vary with temperature (in both space and time) far less steeply than would be expected based on the instantaneous response of enzyme kinetics 44 . This has been shown comprehensively in leaves, and is likely to apply to all plant tissues 1 .…”

Section: Discussionmentioning

confidence: 99%

Forest production efficiency increases with growth temperature

Collalti

Ibrom

Stockmarr

et al. 2020

Preprint

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Introductory paragraphWe present a global analysis of the relationship of forest production efficiency (FPE) to stand age and climate, based on a large compilation of data on gross primary production and either biomass production or net primary production. FPE is important for both forest production and atmospheric carbon dioxide uptake. Earlier findings – FPE declining with age – are supported by this analysis. However, FPE also increases with absolute latitude, precipitation and (all else equal) with temperature. The temperature effect is opposite to what would be expected based on the short-term physiological response of respiration rates to temperature. It implies top-down regulation of forest carbon loss, perhaps reflecting the higher carbon costs of nutrient acquisition in colder climates. Current ecosystem models do not reproduce this phenomenon. They consistently predict lower FPE in warmer climates, and are therefore likely to overestimate carbon losses in a warming climate.

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Acclimation of leaf respiration consistent with optimal photosynthetic capacity

Cited by 71 publications

References 69 publications

Forest production efficiency increases with growth temperature

Forest production efficiency increases with growth temperature

When and where soil is important to modify the carbon and water economy of leaves

Forest production efficiency increases with growth temperature

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