نتایج جستجو برای: carbon isotope discrimination
تعداد نتایج: 371542 فیلتر نتایج به سال:
[1] Photosynthesis and respiration impart distinct isotopic signatures to the atmosphere that are used to constrain global carbon source/sink estimates and partition ecosystem fluxes. Increasingly, the ‘‘Keeling plot’’ method is being used to determine the carbon isotope composition of ecosystem respiration (dCR) in order to better understand the processes controlling ecosystem isotope discrimi...
Geochemical variations of the Pro terozoic dolomite samples close to the ore deposits in the Renison mine area, Tasmania, Austra lia. arc the result of alteration. The oxygen tsotope va lues of the most altered dolomites surrounding the orc deposit indicates that these arc affected oy hot (up to abou t 350°C) hydro thermal nuids. There is a trend of decreasing lighter oxygen and carbon is...
There is currently a great deal of interest in using stable isotope methods to investigate diet, trophic level and migration in wild cetaceans. In order to correctly interpret the results stemming from these methods, it is crucial to understand how diet isotopic values are reflected in consumer tissues. In this study, we investigated patterns of isotopic discrimination between diet and blood co...
he efficiency of photosynthesis continues to interest biochemists, biologists, and plant physiologists. Scientists interested in CO2 uptake are concerned about the extent to which the uptake rate is limited by such factors as stomatal diffusion and the chemistry of the CO2 absorption process. The fractionation of carbon isotopes that occurs during photosynthesis is one of the most useful techni...
Interpretation of stable isotope ratios of carbon and nitrogen (δ(13)C and δ(15)N) is generally based on the assumption that with each trophic level there is a constant enrichment in the heavier isotope, leading to diet-tissue discrimination factors of 3.4‰ for (15)N (ΔN) and ∼0.5‰ for (13)C (ΔC). Diet-tissue discrimination factors determined from paired tissue and gut samples taken from 152 in...
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