A large nitrogen supply from the stable mineral-associated soil organic matter fraction

Villarino, Sebastián H.; Talab, Emir; Contisciani, Luciano; Videla, Cecilia; Di Geronimo, Paula; Mastrángelo, Matias E.; Georgiou, Katerina; Jackson, Robert B.; Piñeiro, Gervasio

doi:10.1007/s00374-023-01755-z

A large nitrogen supply from the stable mineral-associated soil organic matter fraction

Journal Article · Tue Jul 11 00:00:00 EDT 2023 · Biology and Fertility of Soils

DOI:https://doi.org/10.1007/s00374-023-01755-z· OSTI ID:1994040

^[1]; Talab, Emir ^[2]; Contisciani, Luciano ^[3]; Videla, Cecilia ^[2]; Di Geronimo, Paula ^[2]; Mastrángelo, Matias E. ^[4]; Georgiou, Katerina ^[5]; Jackson, Robert B. ^[6]; Piñeiro, Gervasio ^[7]

National Scientific and Technical Research Council (CONICET), Buenos Aires (Argentina); Universidad Nacional de Mar del Plata (UNMdP), Argentina; Iowa State University, Ames, IA (United States)
Universidad Nacional de Mar del Plata (UNMdP), Argentina
University of Buenos Aires (Argentina)
National Scientific and Technical Research Council (CONICET), Buenos Aires (Argentina); Universidad Nacional de Mar del Plata (UNMdP), Argentina
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Stanford University, CA (United States)
University of Buenos Aires (Argentina); Universidad de la República (Uruguay)

Soil organic matter (SOM) mineralization and nitrogen (N) release are key biogeochemical processes for which the relative contribution of particulate (POM) and mineral-associated organic matter (MAOM) fractions is poorly understood. MAOM is generally considered to be a more stable fraction that contains most of the soil organic N, whereas POM is more readily decomposable and contains less N. We measured variations in the potentially mineralizable N from each SOM fraction across three contrasting land uses (forest, pasture, and croplands) and two different grazing managements (rotational and continuous grazing). Contrary to expectations, we found that the MAOM fraction consistently supplied more N than the POM fraction during SOM mineralization in all land-uses evaluated. Across our environmental gradient, potentially mineralizable N from POM increased with the carbon (C) concentration and C/N ratio of POM, while potentially mineralizable N from MAOM increased with the C concentration of MAOM but decreased with clay content. Our work suggests that MAOM contributions to short-term N mineralization and N supply to plants have been undervalued.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Scientific and Technical Research Council (CONICET)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1994040

Report Number(s):: LLNL-JRNL-850989; 1077326

Journal Information:: Biology and Fertility of Soils, Journal Name: Biology and Fertility of Soils Journal Issue: na Vol. na; ISSN 0178-2762

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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