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Ecology · 2009 · Vol. 90 · Issue 6 · Wiley
The 13 C/ 12 C ratio in pedogenic carbonate (i.e., CaCO 3 formed in soil) is a significant tool for investigating C 4 biomes of the past. However, the paleoecological meaning of δ 13 C values in pedogenic carbonate can change with the scale at which one considers the data. We describe studies of modern soils, fossil soils, and vegetation change in the Chihuahuan Desert of North America and elsewhere that reveal four scales imp...