Computer Science
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58..393w&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 58, Issue 1, pp.393-399
Computer Science
4
Scientific paper
A diffusion-reaction model for soil 14 CO 2 is described that analyzes the 14 CO 2 distribution in soils. It shows that the 14 C content of soil CO 2 is not the same as that of atmospheric CO 2 and varies with depth depending on various factors. The most important factors affecting the 14 C content of soil CO 2 include the 14 C content of soil organic matter, the relative contribution of root respired CO 2 to total CO 2 production, soil respiration rate, atmospheric CO 2 concentration and 14 CO 2 content, and soil properties such as temperature and moisture content etc. The 14 C content of soil CO 2 not only can be a sensitive indicator of the residence time of decomposing organic matter in the soil, but also determines the 14 C content of pedogenic carbonate. Our model suggests that soil CO 2 could be enriched or depleted in 14 C relative to atmospheric CO 2 , depending on the relative contribution of root respiration to total soil respiration and on the turnover rate of the soil organic matter contributing to the soil CO 2 . Therefore, the initial 14 C dates of soil carbonate could differ from the true ages of pedogenesis. The processes and factors considered by the model are a first step in determining whether the 14 C content of soil carbonate could lead to reliable dates of pedogenesis.
Amundson Ronald
Trumbore Susan
Wang Yang
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