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March 16, 2026CATENA0 citationsOpen Access

Soil organic carbon in Ultisol landscapes: Influence of erosion rates, soil development, depth, and hillslope properties

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NVNora VaughanMEMartha Cary EppesDVDavid S. Vinson

Key Points

  • To quantify soil organic carbon stocks and examine their relationships with erosion rates and soil properties in Ultisol landscapes.
  • Analyzed SOC stocks from 30 soil pits in low-order watersheds
  • Measured erosion rates using 10Be isotopes
  • Examined soil depth, clay content, and pedogenic iron concentrations
  • Compared SOC across different hillslope positions and aspects
  • SOC stocks are higher in basins with lower erosion rates
  • Well-developed soils show greater SOC due to higher clay and iron content
  • SOC density varies more with erosion rates than with hillslope aspect or position
  • Significant SOC storage is found below 30 cm depth, often underestimated in surface samples

Abstract

Although soils represent one of the largest global carbon reservoirs, soil organic carbon (SOC) stocks remain poorly quantified across many landscapes, limiting effective land management aimed at carbon sequestration in the pedosphere. Here, we report SOC stocks from 30 soil pits (sample n = 212) in low-order watersheds located in a slowly eroding (30 cm) in the Piedmont is significant and likely underappreciated.

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Cite This Study

Vaughan et al. (2026) studied this question.

synapsesocial.com/papers/69b79e488166e15b153ab57chttps://doi.org/10.1016/j.catena.2026.109967
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