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Analyses of carbon isotope ratios (?13C) in soil organic matter (SOM) and soil respired CO2 provide insights into dynamics of the carbon cycle. ?13C analyses do not provide direct measures of soil CO2 efflux rates but are useful as a constraint in carbon cycle models. In many cases, ?13C analyses allow the identification of components of soil CO2 efflux as well as the relative contribution of soil to overall ecosystem CO2 fluxes. ?13C values provide a unique tool for quantifying historical shifts between C3 and C4 ecosystems over decadal to millennial time scales, which are relevant to climate change and land-use change issues. We identify the need to distinguish between ?13C analyses of SOM and those of soil CO2...
Causes for the widespread abundance of the alien grass Bromus tectorum (cheatgrass) after fire in semiarid areas of western North America may include: (1) utilization of resources freed by the removal of fireintolerant plants; and (2) successful competition between B. tectorum and individual plants that survive fire. On a site in northwestern Nevada (USA), measurements of soil water content, plant water potential, aboveground biomass production, water use efficiency, and B. tectorum tiller density were used to determine if B. tectorum competes with either of two native species (Stipa comata and Chrysothamnus viscidiflorus) or simply uses unclaimed resources. Soil water content around native species occurring with...
Carbon isotope discrimination (?) was measured for leaves of Atriplex confertifolia along a salinity gradient in northern Utah. Over this gradient, the variation of ? values was high for a C4 species, and the ? values were positively correlated with salinity in both years of study. Of the possible explanations for this patter, the ? results are consistent with the notion that salinity induces an increase in the bundle sheath leakiness of these C4 plants. Published in Western North American Naturalist, volume 55, issue 2, on pages 135 - 41, in 1995.

    map background search result map search result map Carbon isotope discrimination in the C4 shrub Atriplex confertifolia along a salinity gradient Carbon-13 values in tree leaves in Florida (2018) Carbon-13 values in tree leaves in Florida (2018) Carbon isotope discrimination in the C4 shrub Atriplex confertifolia along a salinity gradient