Aligning theoretical and empirical representations of soil carbon-to-nitrogen stoichiometry with process-based terrestrial biogeochemistry models

Rocci, Katherine S.; Cleveland, Cory C.; Eastman, Brooke A.; Georgiou, Katerina; Grandy, A. Stuart; Hartman, Melannie D.; Hauser, Emma; Holland-Moritz, Hannah; Kyker-Snowman, Emily; Pierson, Derek; Reich, Peter B.; Schlerman, Else P.; Wieder, William R.

doi:10.1016/j.soilbio.2023.109272

Title: Aligning theoretical and empirical representations of soil carbon-to-nitrogen stoichiometry with process-based terrestrial biogeochemistry models

Journal Article · Fri Dec 08 00:00:00 EST 2023 · Soil Biology and Biochemistry

DOI:https://doi.org/10.1016/j.soilbio.2023.109272· OSTI ID:2293650

^[1]; Cleveland, Cory C. ^[2]; Eastman, Brooke A. ^[3]; Georgiou, Katerina ^[4]; Grandy, A. Stuart ^[5]; Hartman, Melannie D. ^[6]; Hauser, Emma ^[2]; Holland-Moritz, Hannah ^[5]; Kyker-Snowman, Emily ^[7]; Pierson, Derek ^[8]; Reich, Peter B. ^[9]; Schlerman, Else P. ^[5]; Wieder, William R. ^[10]

University of Colorado, Boulder, CO (United States); University of Michigan, Ann Arbor, MI (United States)
University of Montana, Missoula, MT (United States)
West Virginia University, Morgantown, WV (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
University of New Hampshire, Durham, NH (United States)
Colorado State University, Fort Collins, CO (United States)
Carbon Direct, New York, NY (United States)
USDA Forest Service, Boise, ID (United States). Rocky Mountain Research Station
University of Michigan, Ann Arbor, MI (United States); University of Minnesota, St. Paul, MN (United States)
University of Colorado, Boulder, CO (United States); National Center for Atmospheric Research (NCAR), Boulder, CO (United States)

Soil carbon-nitrogen (C:N) stoichiometry acts as a control over decomposition and soil organic matter formation and loss, making it a key soil property for understanding ecosystem dynamics and projected ecosystems responses to global environmental change. However, the controls of soil C:N and how they respond to increasing pressures from global change agents are not fully understood. The “foundational” controls on soil C:N, namely plant and microbial C:N, have been used to predict soil C:N, but fail to accurately simulate all ecosystems and may be insufficient for predictions under global environmental change. Here we present an “emerging” representation of controls of soil C:N that includes plant-microbe-mineral feedbacks that have been shown to regulate soil C:N. We argue that including representation of these emerging drivers in process-based terrestrial biogeochemistry models, which include biological N fixation, mycorrhizae, priming, root exudation of organic acids, and mineralogy (including soil texture, mineral composition, and aggregation), will improve mechanistic representation of soil C:N and associated processes. Such improvements will produce models that will better simulate a variety of ecological states and predict soil C:N when global changes modify plant-microbe-mineral interactions. Here, we align our empirical understanding of controls of soil C:N with those controls represented in models, identifying contexts where emerging drivers might be particularly important to represent (e.g., priming and root exudation in nutrient-limited conditions) and areas of future work. Additionally, we show that implementing emerging drivers of soil C:N results in different simulated outcomes at steady state and in response to elevated atmospheric CO2. Our review and preliminary simulations support the need to incorporate emerging drivers of soil C:N into process-based terrestrial biogeochemistry models, allowing for both theoretical exploration of mechanisms and potentially more accurate predictions of land biogeochemical responses to global change.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); United States Department of Agriculture (USDA); National Science Foundation (NSF)

Grant/Contract Number:: AC52-07NA27344; 2020-67019-31395; 1926413; DBI-2021898; DEB-1831944; 2031253; 2031238; 2022070; DEB-1754126

OSTI ID:: 2293650

Report Number(s):: LLNL-JRNL-852812; 1080356

Journal Information:: Soil Biology and Biochemistry, Vol. 189, Issue N/A; ISSN 0038-0717

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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