Seasonal Variations of the Photosynthetic Efficiency of Evergreen Conifers

Bourdeau, Philippe F.

doi:10.2307/1929923

Cited by 78 publications

(40 citation statements)

References 4 publications

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“…There are only 23 days in the data where the temperature during the day is slightly below zero. In DALEC EV no provision is made for when the temperature goes below zero, which is when photosynthesis slows down or stops 30 . In DALEC EV photosynthesis takes place whatever the temperature.…”

Section: Variation In the Atmospheric Carbon And Temperaturementioning

confidence: 99%

A dynamical systems analysis of the data assimilation linked ecosystem carbon (DALEC) models

Chuter

Aston

Skeldon

et al. 2014

Chaos: An Interdisciplinary Journal of Nonlinear Science

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Changes in our climate and environment make it ever more important to understand the processes involved in Earth systems, such as the carbon cycle. There are many models that attempt to describe and predict the behaviour of carbon stocks and stores but, despite their complexity, significant uncertainties remain. We consider the qualitative behaviour of one of the simplest carbon cycle models, the Data Assimilation Linked Ecosystem Carbon (DALEC) model, which is a simple vegetation model of processes involved in the carbon cycle of forests, and consider in detail the dynamical structure of the model. Our analysis shows that the dynamics of both evergreen and deciduous forests in DALEC are dependent on a few key parameters and it is possible to find a limit point where there is stable sustainable behaviour on one side but unsustainable conditions on the other side. The fact that typical parameter values reside close to this limit point highlights the difficulty of predicting even the correct trend without sufficient data and has implications for the use of data assimilation methods. We show that the DALEC model contains a transition point where, for parameters on one side forests thrive, but on the other they die. Analysing data from two forests we find that they sit near the transition point, and we hypothesize that this is a natural consequence of a tree's need to optimize its resources.Such transition points are important because, in a changing world, we expect parameter values to drift. Drifting across a transition point can have serious consequences and results in "tipping" from one kind of behaviour to another.For example, a shift in the amount of rainfall could induce tipping from a sustainable forest to a forests that dies. The presence of such transition points also has important consequences for prediction. Models often contain many parameters that need to be determined, usually by fitting to data. Different algorithms used to fit models to data typically lead to slightly different values for parameters.Away from transition points for non-chaotic systems, this usually means that there is some small uncertainty in the parameter values that leads to a small uncertainty in prediction. However, near transitions points, small differences in parameter values can lead to very different predictions.

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Section: Variation In the Atmospheric Carbon And Temperaturementioning

confidence: 99%

A dynamical systems analysis of the data assimilation linked ecosystem carbon (DALEC) models

Chuter

Aston

Skeldon

et al. 2014

Chaos: An Interdisciplinary Journal of Nonlinear Science

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“…Photosynthesis study ofconiferous tree species Bourdeau (1959; is among the first scientists to have tried to answer some basic questions. He has studied (Bourdeau, 1959) the photosynthetic efficiency of isolated twigs of two spruces, of Tsuga canadensis and Pinus sylvestris during one year or one winter season under different or constant photoperiods by measuring CO 2 gas exchange with the aid of an infra-red gas analyser' +).…”

Section: A Survey Of the Literature Published In The 1960'smentioning

confidence: 99%

“…He has studied (Bourdeau, 1959) the photosynthetic efficiency of isolated twigs of two spruces, of Tsuga canadensis and Pinus sylvestris during one year or one winter season under different or constant photoperiods by measuring CO 2 gas exchange with the aid of an infra-red gas analyser' +). Among other things, he showed that the spruce photosynthetic apparatus loses most of its efficiency dUI ing the winter months and that photoperiod has no effect on the photosynthetic activity of eastern hemlock and Scotch pine.…”

Section: A Survey Of the Literature Published In The 1960'smentioning

confidence: 99%

“…Among other things, he showed that the spruce photosynthetic apparatus loses most of its efficiency dUI ing the winter months and that photoperiod has no effect on the photosynthetic activity of eastern hemlock and Scotch pine. Verdun (1959) has expressed the data given by Bourdeau (1959) in new reference terms (pmole of CO 2 per unit leaf area, etc.) All spruce photosynthetic rates were lower than those of apple (Pyrus malus).…”

Section: A Survey Of the Literature Published In The 1960'smentioning

confidence: 99%

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Tree Breeding for Photosynthetic Efficiency

Falkenhagen

1976

South African Forestry Journal

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Some recent results obtained in studying the genetic variability of photosynthetic rates in forest trees and its implications in breeding trees with better growth performance are discussed. Results are still scanty and difficult to interpret but point out to genetically based differences in photosynthesis in forest trees. These differences might be used in the future, in spite of the apparent complicated mode of inheritance of this physiological trait. OPSOMMING Onlangse resultate wat verkry is in die studie van die genetiese variabiliteit in tempo van fotosintese by bosbome en die implikasies daarvan in boomveredeling . vir beter groeivertoning word bespreek. Resultate is nog beperk en moeilik om te interpreteer maar dui op verskille in fotosintese by bosbome wat geneties gebaseer is.Hierdie uerskille han in die toekoms gebruik word, ten spyte van die skynbare gekompliseerde oorerwingspatroon van hierdiefisiologiese eienskap.

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“…l&owing the total volu~ne of the whole apparatus and tlle concentration of carbon dioxide in it, one call calculate the absolute amouilts of carbon dioxide either absorbed or evolved by a plant per unit time. A closed-circuit apparatus has beell used for the study of photosynthesis in Pelargoni~~m (26), conifers (3), i l f i~n z~l~~s (9), tobacco (lo), Scotch pine (7), respiratioil in several species of higllcr plants (S), and photosyiltllesis in Norway spruce (5) and in barley (29).…”

Section: Introductionmentioning

confidence: 99%

A CLOSED-CIRCUIT APPARATUS WITH AN INFRARED CO₂ ANALYZER AND A GEIGER TUBE FOR CONTINUOUS MEASUREMENT OF CO₂ EXCHANGE IN PHOTOSYNTHESIS AND RESPIRATION

Lister¹,

Krotkov²,

Nelson³

1961

Can. J. Bot.

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Seasonal Variations of the Photosynthetic Efficiency of Evergreen Conifers

Cited by 78 publications

References 4 publications

A dynamical systems analysis of the data assimilation linked ecosystem carbon (DALEC) models

A dynamical systems analysis of the data assimilation linked ecosystem carbon (DALEC) models

Tree Breeding for Photosynthetic Efficiency

A CLOSED-CIRCUIT APPARATUS WITH AN INFRARED CO₂ ANALYZER AND A GEIGER TUBE FOR CONTINUOUS MEASUREMENT OF CO₂ EXCHANGE IN PHOTOSYNTHESIS AND RESPIRATION

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Seasonal Variations of the Photosynthetic Efficiency of Evergreen Conifers

Cited by 78 publications

References 4 publications

A dynamical systems analysis of the data assimilation linked ecosystem carbon (DALEC) models

A dynamical systems analysis of the data assimilation linked ecosystem carbon (DALEC) models

Tree Breeding for Photosynthetic Efficiency

A CLOSED-CIRCUIT APPARATUS WITH AN INFRARED CO2 ANALYZER AND A GEIGER TUBE FOR CONTINUOUS MEASUREMENT OF CO2 EXCHANGE IN PHOTOSYNTHESIS AND RESPIRATION

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A CLOSED-CIRCUIT APPARATUS WITH AN INFRARED CO₂ ANALYZER AND A GEIGER TUBE FOR CONTINUOUS MEASUREMENT OF CO₂ EXCHANGE IN PHOTOSYNTHESIS AND RESPIRATION