Biogeochemistry of the Stable Isotopes of Hydrogen and Carbon in Salt Marsh Biota | Zendy

Bruce N. Smith | Zendy; Samuel Epstein | Zendy

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Biogeochemistry of the Stable Isotopes of Hydrogen and Carbon in Salt Marsh Biota

Author(s) -

Bruce N. Smith,

Samuel Epstein

Publication year - 1970

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.46.5.738

Subject(s) - fractionation , deuterium , environmental chemistry , chemistry , hydrogen , isotopes of carbon , carbon fibers , isotope , salt marsh , biogeochemistry , δ13c , stable isotope ratio , radiochemistry , ecology , total organic carbon , biology , chromatography , organic chemistry , physics , materials science , quantum mechanics , composite number , composite material

Deuterium to hydrogen ratios of 14 plant species from a salt marsh and lagoon were 55 per thousand depleted in deuterium relative to the environmental water. Carbon tetrachloride-extractable material from these plants was another 92 per thousand depleted in deuterium. This gave a fractionation factor from water to CCl(4) extract of 1.147. This over-all fractionation was remarkably constant for all species analyzed. Plants also discriminate against (13)C, particularly in the lipid fraction. Data suggest that different mechanisms for carbon fixation result in different fractionations of the carbon isotopes. Herbivore tissues reflected the isotopic ratios of plants ingested. Apparently different metabolic processes are responsible for the different degrees of fractionation observed for hydrogen and carbon isotopes.

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