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October 19, 2024Geoderma RegionalOpen Access

Surface soil sampling underestimates soil carbon and nitrogen storage of long-term cover cropping

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Authors

YPYajun PengLELaura L. Van Eerd

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Overview

Long-term experiment demonstrates increased deep-soil carbon and nitrogen storage in agricultural soils, indicating shallow sampling protocols underestimate cover crop benefits.

Key Points

  • Determine the impact of 15 years of cover cropping on soil organic carbon and total nitrogen stocks across deep soil profiles compared to conventional shallow sampling.
  • Conducted deep soil sampling (0–120 cm depth) in a 15-year cover cropping experiment situated in a horticulture-grain system on sandy loam soil.
  • Calculated soil organic carbon (SOC) and total nitrogen (TN) stocks on an equivalent soil mass basis using a cubic spline model.
  • Separated bulk soil into particulate organic matter (POM) and mineral-associated organic matter (MAOM) pools to identify depth-dependent storage mechanisms.
  • Long-term cover cropping increased SOC and TN stocks in the 0–120 cm depth by 22% (95% CI: 5–43%) and 26% (95% CI: 6–49%), respectively, compared with no cover cropping.
  • Annual sequestration rates in the 0–30 cm depth reached 0.53 Mg C ha⁻¹ yr⁻¹ and 0.06 Mg N ha⁻¹ yr⁻¹, but cover cropping showed no significant effect when evaluating only the 0–15 cm depth.
  • The particulate organic matter pool represented the primary store of carbon and nitrogen in surface soils, whereas the mineral-associated organic matter pool dominated deeper layers without changes in soil texture.

Cite This Study

Peng et al. (2024) studied this question.

synapsesocial.com/papers/6a1e9c06eed4f0c78fa411bbhttps://doi.org/10.1016/j.geodrs.2024.e00885
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