Microbial-explicit processes and refined perennial plant traits improve modeled ecosystem carbon dynamics

Berardi, Danielle M.; Hartman, Melannie D.; Brzostek, Edward R.; Bernacchi, Carl J.; DeLucia, Evan H.; von Haden, Adam C.; Kantola, Ilsa; Moore, Caitlin E.; Yang, Wendy H.; Hudiburg, Tara W.; Parton, William J.

doi:10.1016/j.geoderma.2024.116851

Title: Microbial-explicit processes and refined perennial plant traits improve modeled ecosystem carbon dynamics

Journal Article · 11 March 2024 · Geoderma

DOI: https://doi.org/10.1016/j.geoderma.2024.116851 · OSTI ID:2322607

Berardi, Danielle M. ^[1]; Hartman, Melannie D. ^[2]; Brzostek, Edward R. ^[3]; Bernacchi, Carl J. ^[4]; DeLucia, Evan H. ^[5]; von Haden, Adam C. ^[6];

^[7]; Moore, Caitlin E. ^[8]; Yang, Wendy H. ^[5]; Hudiburg, Tara W. ^[9]; Parton, William J. ^[2]

Center for Advanced Bioenergy and Bioproducts Innovation (CABBI), Urbana, IL (United States); Univ. of Idaho, Moscow, ID (United States); Univ. of Wyoming, Laramie, WY (United States)
Center for Advanced Bioenergy and Bioproducts Innovation (CABBI), Urbana, IL (United States); Colorado State Univ., Fort Collins, CO (United States)
Center for Advanced Bioenergy and Bioproducts Innovation (CABBI), Urbana, IL (United States); West Virginia Univ., Morgantown, WV (United States)
Center for Advanced Bioenergy and Bioproducts Innovation (CABBI), Urbana, IL (United States); US Dept. of Agriculture (USDA), Urbana, IA (United States). Agricultural Research Service (ARS). Global Change Photosynthesis Research Unit; Univ. of Illinois at Urbana-Champaign, IL (United States). Institute for Sustainability, Energy and Environment
Center for Advanced Bioenergy and Bioproducts Innovation (CABBI), Urbana, IL (United States); Univ. of Illinois at Urbana-Champaign, IL (United States). Institute for Sustainability, Energy and Environment
Center for Advanced Bioenergy and Bioproducts Innovation (CABBI), Urbana, IL (United States); Univ. of Wisconsin, Madison, WI (United States)
Univ. of Illinois at Urbana-Champaign, IL (United States). Institute for Sustainability, Energy and Environment
Univ. of Western Australia, Crawley, WA (Australia)
Center for Advanced Bioenergy and Bioproducts Innovation (CABBI), Urbana, IL (United States); Univ. of Idaho, Moscow, ID (United States)

Globally, soils hold approximately half of ecosystem carbon and can serve as a source or sink depending on climate, vegetation, management, and disturbance regimes. Understanding how soil carbon dynamics are influenced by these factors is essential to evaluate proposed natural climate solutions and policy regarding net ecosystem carbon balance. Soil microbes play a key role in both carbon fluxes and stabilization. However, biogeochemical models often do not specifically address microbial-explicit processes. Here, we incorporated microbial-explicit processes into the DayCent biogeochemical model to better represent large perennial grasses and mechanisms of soil carbon formation and stabilization. We also take advantage of recent model improvements to better represent perennial grass structural complexity and life-history traits. Specifically, this study focuses on: 1) a plant sub-model that represents perennial phenology and more refined plant chemistry with downstream implications for soil organic matter (SOM) cycling though litter inputs, 2) live and dead soil microbe pools that influence routing of carbon to physically protected and unprotected pools, 3) Michaelis-Menten kinetics rather than first-order kinetics in the soil decomposition calculations, and 4) feedbacks between decomposition and live microbial pools. We evaluated the performance of the plant sub-model and two SOM cycling sub-models, Michaelis-Menten (MM) and first-order (FO), using observations of net ecosystem production, ecosystem respiration, soil respiration, microbial biomass, and soil carbon from long-term bioenergy research plots in the mid-western United States. The MM sub-model represented seasonal dynamics of soil carbon fluxes better than the FO sub-model which consistently overestimated winter soil respiration. While both SOM sub-models were similarly calibrated to total, physically protected, and physically unprotected soil carbon measurements, the models differed in future soil carbon response to disturbance and climate, most notably in the protected pools. Adding microbial-explicit mechanisms of soil processes to ecosystem models will improve model predictions of ecosystem carbon balances but more data and research are necessary to validate disturbance and climate change responses and soil pool allocation.

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Research Organization:: Center for Advanced Bioenergy and Bioproducts Innovation (CABBI), Urbana, IL (United States)

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

Grant/Contract Number:: SC0018420; 2021-67020-33419

OSTI ID:: 2322607

Alternate ID(s):: OSTI ID: 2325010

Journal Information:: Geoderma, Vol. 443; ISSN 0016-7061

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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54 ENVIRONMENTAL SCIENCES
microbial-explicit soil organic matter model
DayCent
carbon
switchgrass
miscanthus
soil respiration
measurable soil pools

Title: Microbial-explicit processes and refined perennial plant traits improve modeled ecosystem carbon dynamics

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