Filters: Tags: carbon isotope ratio (X)25 results (110ms)
Aircraft observations of delta super(13)C of atmospheric methane over the Pacific in August 1991 and 1993: Evidence of an enrichment in super(13)CH sub(4) in the Southern Hemisphere
We measured foliar δ13C of Conocarpus erectus collected from Big Pine Key in 2018 as a proxy for ground water salinity.
Sedimentation of super(13)C-rich organic matter from Antarctic sea-ice algae: A potential indicator of past sea-ice extent
Isotopic composition of otoliths as a chemical tracer in population identification of sockeye salmon (Oncorhynchus nerka)
Isotope evidence of paleo-El Nino-Southern Oscillation cycles in loess-paleosol record in the Central United States
Molecular stable carbon isotope study of organic matter in immature Miocene Monterey sediments, Pismo Basin
Late Devonian carbon isotope stratigraphy and sea level fluctuations, Canning Basin, Western Australia
Soil water exploitation after fire: competition between Bromus tectorum (cheatgrass) and two native species
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...
Stable isotope compositions (O-C) of reef fish otoliths from the Taiaro Lagoon (Tuamotu, French Polynesia): isotopic and biologic implications.
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...
Response of a natural Phaeocystis population to ambient fluctuations of UVB radiation caused by Antarctic ozone depletion