Two categories of c/c ratios for higher plants.
(13)C/(12)C ratios have been determined for plant tissue from 104 species representing 60 families. Higher plants fall into two categories, those with low delta(PDBI) (13)C values (-24 to -34 per thousand) and those with high delta (13)C values (-6 to -19 per thousand). Algae have delta (13)C values of -12 to -23 per thousand. Photosynthetic fractionation leading to such values is discussed.
Smith
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Division of Geological Sciences, California Institute of Technology, Pasadena, California 91106.
Epstein
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