Carbon 13 in Plants and the Relationships between Carbon 13 and Carbon 14 Variations in Nature

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Abstract
The mechanism of isotopic fractionation in plants is discussed, in an attempt to evaluate the relative effects of the local environment and of the activities of the plants themselves. "Cyclic enrichment processes" have had no effect on the isotopic composition of the various groups of plants. Relationships between C13 and C14 variations in depositional processes of carbonaceous materials are discussed, with respect to the relative enrichment of these isotopes in carbonates. Some 30 new C13 analyses are given, of plants and recent marine foraminifers and mollusks.