title: A laser photoacoustic analysis of residual CO₂ and H₂O in larch stems.
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.
authors: Zuev Institute of Atmospheric Optics, Siberian Branch of the Russian Academy of Sciences, 1 Academician Zuev Square, Tomsk 634021, Russia. ageev@asd.iao.ru.
authors: Boris
authors: B
authors: Ageev
authors: Zuev Institute of Atmospheric Optics, Siberian Branch of the Russian Academy of Sciences, 1 Academician Zuev Square, Tomsk 634021, Russia. yupon@iao.ru.
authors: Yurii
authors: Y
authors: Ponomarev
authors: Zuev Institute of Atmospheric Optics, Siberian Branch of the Russian Academy of Sciences, 1 Academician Zuev Square, Tomsk 634021, Russia. sapo@asd.iao.ru.
authors: Valeria
authors: V
authors: Sapozhnikova
authors: Institute of Monitoring of Climatic and Ecological Systems, Siberian Branch of the Russian Academy of Sciences, 10/3 Academichesky Prospekt, Tomsk 634055, Russia. savchuk@imces.ru.
authors: Dmitry
authors: D
authors: Savchuk
mesh_terms: D002245:Carbon Dioxide / Q000032:analysis*; D002247:Carbon Isotopes / Q000032:analysis; D028221:Larix / Q000737:chemistry*; D007834:Lasers; D061088:Photoacoustic Techniques / Q000379:methods*; D018547:Plant Stems / Q000737:chemistry; D014867:Water / Q000032:analysis*
chemical_list: D002247:Carbon Isotopes; D014867:Water; D002245:Carbon Dioxide