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The terrestrial carbon cycle is influenced by environmental variability at scales ranging from diurnal to interannual. Here, we present 5‐years of growing season (day 131–275) observations of the carbon isotope ratio of ecosystem respiration (δ13CR) from a semiarid woodland. This ecosystem has a large necromass component resulting from 97%Pinus edulis mortality in 2002, is dominated by drought‐tolerant...
In semi-arid regions, where plants using both C3 and C4 photosynthetic pathways are common, the stable C isotope ratio (δ13C) of ecosystem respiration (δ13CR) is strongly variable seasonally and inter-annually. Improved understanding of physiological and environmental controls over these variations will improve C cycle models that rely on the isotopic composition of atmospheric CO2. We hypothesized...
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