In continuation of works on the determination of cyclic tree-stem CO2 efflux, vacuum-extracted gas samples of large woody roots of Siberian stone pine and Scots pine are studied. Laser photoacoustic gas analysis was used to obtain chronologies of CO2 and total pressure of gas components in root rings. Spectral and cross-spectral analyses reveal the cyclic character of variations in the chronologies. Such a behavior of the total pressure and CO2 content in large roots can testify to possible cyclic diffusion of CO2 from the roots into soil and then into the atmosphere, which can be considered as a new feature of autotroph respiration. An attempt is made to analyze results of some previous work on a similar subject based on cyclic CO2 efflux from large roots.
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Original Russian Text © B.G. Ageev, A.N. Gruzgev, Yu.N. Ponomarev, V.A. Sapozhnikova, 2017, published in Optika Atmosfery i Okeana.
The article was translated by the authors.
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Ageev, B.G., Gruzgev, A.N., Ponomarev, Y.N. et al. Variations of Residual CO2 and Pressure in Conifer Woody Roots. Atmos Ocean Opt 31, 146–152 (2018). https://doi.org/10.1134/S1024856018020021
- total pressure
- woody roots