University of California Press

Figure 7

Stable C isotopic signatures of soil organic C pools. δ13C of soil organic C (SOC, a) and K2SO4-extractable organic C (EOC, b) at the Calhoun Critical Zone Observatory at multiple depths in soils supporting three land uses. Depth influenced δ13C of SOC in all soils. SOC values from agricultural plots were 13C-enriched relative to both forests through 100 cm. Values from agricultural plots had 13C-enriched EOC relative to old-growth soils from 0 to 100 cm, and relative to regenerating pine soils from 0 to 25 cm. See text for statistical details. DOI: https://doi.org/10.1525/elementa.287.f7

Stable C isotopic signatures of soil organic C pools. δ¹³C of soil organic C (SOC, a) and K₂SO₄-extractable organic C (EOC, b) at the Calhoun Critical Zone Observatory at multiple depths in soils supporting three land uses. Depth influenced δ¹³C of SOC in all soils. SOC values from agricultural plots were ¹³C-enriched relative to both forests through 100 cm. Values from agricultural plots had ¹³C-enriched EOC relative to old-growth soils from 0 to 100 cm, and relative to regenerating pine soils from 0 to 25 cm. See text for statistical details. DOI: https://doi.org/10.1525/elementa.287.f7

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