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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.

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Related in: MedlinePlus

Annual variations in the CO2 concentrations (ppm) in the larch disc tree rings (settlement of Chernorud, Lake Baikal, Russia).
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biosensors-05-00001-f010: Annual variations in the CO2 concentrations (ppm) in the larch disc tree rings (settlement of Chernorud, Lake Baikal, Russia).

Mentions: For comparison purposes, we have presented the vacuum-desorbed CO2 distributions in the disc tree rings of the 300 year old larch and those relating to the discs brought from other regions, specifically from the region located near Lake Baikal. Figure 10 shows annual variations in the CO2 content measured in the 61 larch disc tree rings brought from the Baikal region. Using second-order polynomial curves, the tree ring CO2 distributions can be grouped together into three time spans. This is indicative of the years wherein the CO2 content in these distributions was at its maximum: 1944, 1961, and 1987. Thus, as Figure 10 suggests, the CO2 content is characterized by (1) distinct short-term cycles modulated by long-term ones and by (2) a negative trend.


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

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

Annual variations in the CO2 concentrations (ppm) in the larch disc tree rings (settlement of Chernorud, Lake Baikal, Russia).
© Copyright Policy
Related In: Results  -  Collection

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

biosensors-05-00001-f010: Annual variations in the CO2 concentrations (ppm) in the larch disc tree rings (settlement of Chernorud, Lake Baikal, Russia).
Mentions: For comparison purposes, we have presented the vacuum-desorbed CO2 distributions in the disc tree rings of the 300 year old larch and those relating to the discs brought from other regions, specifically from the region located near Lake Baikal. Figure 10 shows annual variations in the CO2 content measured in the 61 larch disc tree rings brought from the Baikal region. Using second-order polynomial curves, the tree ring CO2 distributions can be grouped together into three time spans. This is indicative of the years wherein the CO2 content in these distributions was at its maximum: 1944, 1961, and 1987. Thus, as Figure 10 suggests, the CO2 content is characterized by (1) distinct short-term cycles modulated by long-term ones and by (2) a negative trend.

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