Evidence linking calcium to increased organo-mineral association in soils

Rowley, Mike C.; Grand, Stephanie; Spangenberg, Jorge E.; Verrecchia, Eric P.

doi:10.1007/s10533-021-00779-7

Evidence linking calcium to increased organo-mineral association in soils

Journal Article · Sun Apr 04 00:00:00 EDT 2021 · Biogeochemistry

DOI:https://doi.org/10.1007/s10533-021-00779-7· OSTI ID:1826707

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Univ. de Lausanne (Switzerland); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. de Lausanne (Switzerland)

Geochemical indicators are emerging as important predictors of soil organic carbon (SOC) dynamics, but evidence concerning the role of calcium (Ca) is scarce. This study investigates the role of Ca prevalence in SOC accumulation by comparing otherwise similar sites with (CaCO₃-bearing) or without carbonates (CaCO₃-free). We measured the SOC content and indicators of organic matter quality (C stable isotope composition, expressed as δ¹³C values, and thermal stability) in bulk soil samples. We then used sequential sonication and density fractionation (DF) to separate two occluded pools from free and mineral-associated SOC. The SOC content, mass, and δ¹³C values were determined in all the fractions. X-ray photoelectron spectroscopy was used to investigate the surface chemistry of selected fractions. Our hypothesis was that occlusion would be more prevalent at the CaCO₃-bearing site due to the influence of Ca on aggregation, inhibiting oxidative transformation, and preserving lower δ¹³C values. Bulk SOC content was twice as high in the CaCO₃-bearing profiles, which also had lower bulk δ¹³C values, and more occluded SOC. Yet, contrary to our hypothesis, occlusion only accounted for a small proportion of total SOC (< 10%). Instead, it was the heavy fraction (HF), containing mineral-associated organic C, which accounted for the majority of total SOC and for the lower bulk δ¹³C values. Overall, an increased Ca prevalence was associated with a near-doubling of mineral-associated SOC content. Future investigations should now aim to isolate Ca-mediated complexation processes that increase organo-mineral association and preserve organic matter with lower δ¹³C values.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1826707

Journal Information:: Biogeochemistry, Journal Name: Biogeochemistry Journal Issue: 3 Vol. 153; ISSN 0168-2563

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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58 GEOSCIENCES
Carbon stable isotopes
Density fractionation
Rock-Eval® pyrolysis
Soil organic carbon
X-ray photoelectron spectroscopy

Evidence linking calcium to increased organo-mineral association in soils

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