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Stable carbon isotope ratios of roots and soil organic matter were measured in Curlew Valley, Utah to determine if changes in the relative dominance of two shrub species had occurred in this salt-desert community. Measurements were made on soil cores along transects stretching from monospecific stands of Ceratoides lanata, a C 3 shrub, to monospecific stands of Atriplex confertifolia, a C 4 shrub. δ 13 C values of roots and soil organic matter under Ceratoides cover appeared to be in equilibrium with the current plant community. By contrast, δ 13 C values of roots and soils under Atriplex portions of the transects were more negative than would be expected for a C 4 -dominated community. These results indicate that a change in relative C 3 /C 4 dominance has occurred, and suggest that the C 4 shrub Atriplex confertifolia is increasing in importance in this salt-desert community.

Carbon isotope ratios of soil organic matter and their use in assessing community composition changes in Curlew Valley, Utah