Steps towards a mechanistic understanding of respiratory temperature responses

Kruse, Jörg; Rennenberg, Heinz; Adams, Mark A.

doi:10.1111/j.1469-8137.2010.03576.x

Cited by 79 publications

(123 citation statements)

References 132 publications

(333 reference statements)

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“…However, the increase in respiration following a long-term rise in temperature is generally lower than that occurring in a shorter period of time because of the thermal acclimation of respiratory metabolism (Atkin and Tjoelker, 2003;Atkin et al, 2005). The depletion of soluble sugars can cause respiration rates to decline in response to sustained hot temperatures, and on the other hand, accumulation of soluble sugars in cold-exposed plants can cause respiration rates to increase (Atkin and Tjoelker, 2003;Atkin et al, 2005;Kruse et al, 2011). This phenomenon of thermal acclimation has been observed in many tree species for leaves and roots, but it has rarely been examined for stems (but see Paembonan et al, 1991;Gansert et al, 2002).…”

Section: Introductionmentioning

confidence: 98%

Stem CO2 efflux and its contribution to ecosystem CO2 efflux decrease with drought in a Mediterranean forest stand

Rodríguez‐Calcerrada

Martin‐StPaul

Lempereur

et al. 2014

Agricultural and Forest Meteorology

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Keywords:Water deficit Respiration acclimation Carbohydrate Carbon balance Forest decline Net ecosystem exchangeThe rate of metabolic processes demanding energy in tree stems changes in relation with prevailing climatic conditions. Tree water availability can affect stem respiration through impacts on growth, phloem transport or maintenance of diverse cellular processes, but little is known on this topic. Here we monitored seasonal changes in stem CO2 efflux(F s ), radial growth, sap flow and non-structural carbohydrates in trees of Quercus ilex in a Mediterranean forest stand subjected since 2003 to either partial (33%) throughfall exclusion (£) or unchanged throughfall (C). F s increased exponentially during the day by an effect of temperature, although sap flow attenuated the increase in F s during the day time. Over the year, F s also increased exponentially with increasing temperatures, but F s computed at a standard temperature of 15 °C (F s 15 ) varied by almost 4-fold among dates. F s 15 was the highest after periods of stem growth and decreased as tree water availability decreased, similarly in Cand E treatments. The decline in F s 15 was not linked to a depletion of soluble sugars, which increased when water stress was higher. The proportion of ecosystem respiration attributed to the stems was highest following stem growth (23.3%) and lowest during the peak of drought (6.5%). High within-year variability in F s 15 makes unadvisable to pool annual data of F s vs. temperature to model F s at short time scales (hours to months) in Mediterranean-type forest ecosystems. We demonstrate that water availability is an important factor governing stem C0 2 efflux and suggest that trees in Mediterranean environments acclimate to seasonal drought by reducing stem respiration. Stem respiratory rates do not seem to change after a long-term increase in drought intensity, however.

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Section: Introductionmentioning

confidence: 98%

Stem CO2 efflux and its contribution to ecosystem CO2 efflux decrease with drought in a Mediterranean forest stand

Rodríguez‐Calcerrada

Martin‐StPaul

Lempereur

et al. 2014

Agricultural and Forest Meteorology

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“…The specific maintenance respiration rate R spec is modelled by a Q 10 relationship (Kruse et al, 2011). It is illustrated in Fig.…”

Section: B54 Respiration and Growthmentioning

confidence: 99%

“…Respiration is modelled by a Q 10 relationship as a function of biomass and temperature (Kruse et al, 2011). Same as GPP, it too depends on metabolic activity.…”

Section: P Porada Et Al: Estimating Global Carbon Uptake By Lichensmentioning

confidence: 99%

Estimating global carbon uptake by lichens and bryophytes with a process-based model

et al. 2013

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Abstract. Lichens and bryophytes are abundant globally and they may even form the dominant autotrophs in (sub)polar ecosystems, in deserts and at high altitudes. Moreover, they can be found in large amounts as epiphytes in old-growth forests. Here, we present the first process-based model which estimates the net carbon uptake by these organisms at the global scale, thus assessing their significance for biogeochemical cycles. The model uses gridded climate data and key properties of the habitat (e.g. disturbance intervals) to predict processes which control net carbon uptake, namely photosynthesis, respiration, water uptake and evaporation. It relies on equations used in many dynamical vegetation models, which are combined with concepts specific to lichens and bryophytes, such as poikilohydry or the effect of water content on CO 2 diffusivity. To incorporate the great functional variation of lichens and bryophytes at the global scale, the model parameters are characterised by broad ranges of possible values instead of a single, globally uniform value. The predicted terrestrial net uptake of 0.34 to 3.3 Gt yr −1 of carbon and global patterns of productivity are in accordance with empirically-derived estimates. Considering that the assimilated carbon can be invested in processes such as weathering or nitrogen fixation, lichens and bryophytes may play a significant role in biogeochemical cycles.

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“…1). Other possible sources of curvature in the Arrhenius may include changes in heat capacity of rate-limiting enzymes (Hobbs et al 2013) and the combined effect of MichaelisMenten and Arrhenius kinetics (Kruse et al 2011).…”

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confidence: 99%

Real versus Artificial Variation in the Thermal Sensitivity of Biological Traits

Pawar

Dell

Savage

et al. 2016

The American Naturalist

136

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Whether the thermal sensitivity of an organism's traits follows the simple Boltzmann-Arrhenius model remains a contentious issue that centers around consideration of its operational temperature range and whether the sensitivity corresponds to one or a few underlying rate-limiting enzymes. Resolving this issue is crucial, because mechanistic models for temperature dependence of traits are required to predict the biological effects of climate change. Here, by combining theory with data on 1,085 thermal responses from a wide range of traits and organisms, we show that substantial variation in thermal sensitivity (activation energy) estimates can arise simply because of variation in the range of measured temperatures. Furthermore, when thermal responses deviate systematically from the Boltzmann-Arrhenius model, variation in measured temperature ranges across studies can bias estimated activation energy distributions toward higher mean, median, variance, and skewness. Remarkably, this bias alone can yield activation energies that encompass the range expected from biochemical reactions (from ∼0.2 to 1.2 eV), making it difficult to establish whether a single activation energy appropriately captures thermal sensitivity. We provide guidelines and a simple equation for partially correcting for such artifacts. Our results have important implications for understanding the mechanistic basis of thermal responses of biological traits and for accurately modeling effects of variation in thermal sensitivity on responses of individuals, populations, and ecological communities to changing climatic temperatures.

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Steps towards a mechanistic understanding of respiratory temperature responses

Cited by 79 publications

References 132 publications

Stem CO2 efflux and its contribution to ecosystem CO2 efflux decrease with drought in a Mediterranean forest stand

Stem CO2 efflux and its contribution to ecosystem CO2 efflux decrease with drought in a Mediterranean forest stand

Estimating global carbon uptake by lichens and bryophytes with a process-based model

Real versus Artificial Variation in the Thermal Sensitivity of Biological Traits

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