Limits...
A laser photoacoustic analysis of residual CO₂ and H₂O in larch stems.

Ageev B, Ponomarev Y, Sapozhnikova V, Savchuk D - Biosensors (Basel) (2014)

Bottom Line: Every so often, the results obtained from investigations into the effects of varying environmental conditions on the tree growth rate at the same sites and on the change in the carbon balance in plants, using traditional methods, are found to differ widely.Conclusions are made regarding the response of annual larch CO2 disc tree ring distributions to climatic parameters (temperatures and precipitation).The data about the CO2 disc content for different sites are compared.

View Article: PubMed Central - PubMed

Affiliation: Zuev Institute of Atmospheric Optics, Siberian Branch of the Russian Academy of Sciences, 1 Academician Zuev Square, Tomsk 634021, Russia. ageev@asd.iao.ru.

ABSTRACT
Every so often, the results obtained from investigations into the effects of varying environmental conditions on the tree growth rate at the same sites and on the change in the carbon balance in plants, using traditional methods, are found to differ widely. We believe that the reason for the ambiguity of the data has to do with failure to account for the role of the residual CO2 (and H2O) in the tree wood exhibiting a climate response. In our earlier work, the results of a laser photoacoustic gas analysis of CO2 and H2O vacuum-desorbed from disc tree rings of evergreen conifer trees were presented. In this paper, laser photoacoustic measurements of tree ring gases in deciduous conifer trees and CO2 carbon isotope composition determined by means of a mass spectrometer are given. Conclusions are made regarding the response of annual larch CO2 disc tree ring distributions to climatic parameters (temperatures and precipitation). The data about the CO2 disc content for different sites are compared.

Show MeSH

Related in: MedlinePlus

Comparison of annual distributions of the concentration of CO2 vacuum-desorbed from the tree ring wood (ppm) and carbon isotope composition of CO2 (Delta 13C) in the 300 year old larch disc for 1815–1822. The concentration of CO2 vacuum-desorbed from the tree ring wood in 1815–1822 is in excess of the CO2 concentration in air observed in recent years (~400 ppm).
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4384077&req=5

biosensors-05-00001-f005: Comparison of annual distributions of the concentration of CO2 vacuum-desorbed from the tree ring wood (ppm) and carbon isotope composition of CO2 (Delta 13C) in the 300 year old larch disc for 1815–1822. The concentration of CO2 vacuum-desorbed from the tree ring wood in 1815–1822 is in excess of the CO2 concentration in air observed in recent years (~400 ppm).

Mentions: There is no way to perform measurements of the CO2 and carbon isotope composition at the same points of the disc tree rings because of high wood material consumption. We used the neighboring tree ring sections for an analysis of these parameters. Our numerous measurements of the carbon isotope composition of the vacuum-desorbed CO2 have shown that an increase in the CO2 concentration in a gas sample brings about changes in the carbon isotope composition: the higher is the CO2 concentration in the sample, the lighter is the isotope composition, and vice versa. As the CO2 and carbon isotope composition has to be measured at different points in the tree rings, on frequent occasions, the shape of the curves is different. Variations in the annual carbon isotope composition of CO2 and in the vacuum-desorbed CO2 in the larch tree rings are illustrated in Figure 5.


A laser photoacoustic analysis of residual CO₂ and H₂O in larch stems.

Ageev B, Ponomarev Y, Sapozhnikova V, Savchuk D - Biosensors (Basel) (2014)

Comparison of annual distributions of the concentration of CO2 vacuum-desorbed from the tree ring wood (ppm) and carbon isotope composition of CO2 (Delta 13C) in the 300 year old larch disc for 1815–1822. The concentration of CO2 vacuum-desorbed from the tree ring wood in 1815–1822 is in excess of the CO2 concentration in air observed in recent years (~400 ppm).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4384077&req=5

biosensors-05-00001-f005: Comparison of annual distributions of the concentration of CO2 vacuum-desorbed from the tree ring wood (ppm) and carbon isotope composition of CO2 (Delta 13C) in the 300 year old larch disc for 1815–1822. The concentration of CO2 vacuum-desorbed from the tree ring wood in 1815–1822 is in excess of the CO2 concentration in air observed in recent years (~400 ppm).
Mentions: There is no way to perform measurements of the CO2 and carbon isotope composition at the same points of the disc tree rings because of high wood material consumption. We used the neighboring tree ring sections for an analysis of these parameters. Our numerous measurements of the carbon isotope composition of the vacuum-desorbed CO2 have shown that an increase in the CO2 concentration in a gas sample brings about changes in the carbon isotope composition: the higher is the CO2 concentration in the sample, the lighter is the isotope composition, and vice versa. As the CO2 and carbon isotope composition has to be measured at different points in the tree rings, on frequent occasions, the shape of the curves is different. Variations in the annual carbon isotope composition of CO2 and in the vacuum-desorbed CO2 in the larch tree rings are illustrated in Figure 5.

Bottom Line: Every so often, the results obtained from investigations into the effects of varying environmental conditions on the tree growth rate at the same sites and on the change in the carbon balance in plants, using traditional methods, are found to differ widely.Conclusions are made regarding the response of annual larch CO2 disc tree ring distributions to climatic parameters (temperatures and precipitation).The data about the CO2 disc content for different sites are compared.

View Article: PubMed Central - PubMed

Affiliation: Zuev Institute of Atmospheric Optics, Siberian Branch of the Russian Academy of Sciences, 1 Academician Zuev Square, Tomsk 634021, Russia. ageev@asd.iao.ru.

ABSTRACT
Every so often, the results obtained from investigations into the effects of varying environmental conditions on the tree growth rate at the same sites and on the change in the carbon balance in plants, using traditional methods, are found to differ widely. We believe that the reason for the ambiguity of the data has to do with failure to account for the role of the residual CO2 (and H2O) in the tree wood exhibiting a climate response. In our earlier work, the results of a laser photoacoustic gas analysis of CO2 and H2O vacuum-desorbed from disc tree rings of evergreen conifer trees were presented. In this paper, laser photoacoustic measurements of tree ring gases in deciduous conifer trees and CO2 carbon isotope composition determined by means of a mass spectrometer are given. Conclusions are made regarding the response of annual larch CO2 disc tree ring distributions to climatic parameters (temperatures and precipitation). The data about the CO2 disc content for different sites are compared.

Show MeSH
Related in: MedlinePlus