
Rapid response of tree cellulose radiocarbon content to changes in atmospheric 14CO2 concentration
Abstract
A detailed radial profile for the 14C concentration in tree stem cellulose, covering growth rings for the years 1962—1964, was obtained for a Sitka spruce of the US Pacific Coast using accelerator mass spectrometry. The tree cellulose 14C closely follows atmospheric 14CO2 concentrations, responding to changes with an apparent delay of 5 to 6 weeks. The delay in response is mostly due to the addition of between 13% and 28% of biospheric CO2 to the canopy-air CO2 used by the tree for stem cellulose. Delayed incorporation and the use of stored photosynthate of the previous fall appear less important.
© 1989 P. M. Grootes, G. W. Farwell, F. H. Schmidt, D. D. Leach, M. Stuiver, published by Stockholm University Press
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