From pools to flow: The PROMISE framework for new insights on soil carbon cycling in a changing world

Waring, Bonnie G.; Sulman, Benjamin N.; Reed, Sasha; Smith, A. Peyton; Averill, Colin; Creamer, Courtney A.; Cusack, Daniela F.; Hall, Steven J.; Jastrow, Julie D.; Jilling, Andrea; Kemner, Kenneth M.; Kleber, Markus; Liu, Xiao‐Jun Allen; Pett‐Ridge, Jennifer; Schulz, Marjorie

doi:10.1111/gcb.15365

From pools to flow: The PROMISE framework for new insights on soil carbon cycling in a changing world

Journal Article · Thu Oct 15 20:00:00 EDT 2020 · Global Change Biology

DOI:https://doi.org/10.1111/gcb.15365· OSTI ID:1731052

^[1]; ^[2]; Reed, Sasha ^[3]; Smith, A. Peyton ^[4]; Averill, Colin ^[5]; ^[6]; Cusack, Daniela F. ^[7]; ^[8]; Jastrow, Julie D. ^[9]; Jilling, Andrea ^[10]; Kemner, Kenneth M. ^[9]; Kleber, Markus ^[11]; Liu, Xiao‐Jun Allen ^[12]; Pett‐Ridge, Jennifer ^[13]; Schulz, Marjorie ^[6]

Utah State Univ., Logan, UT (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
US Geological Survey, Moab, UT (United States)
Texas A & M Univ., College Station, TX (United States)
Eidgenoessische Technische Hochschule, Zurich (Switzerland)
US Geological Survey, Menlo Park, CA (United States)
Colorado State Univ., Fort Collins, CO (United States)
Iowa State Univ., Ames, IA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Oklahoma State Univ., Stillwater, OK (United States)
Oregon State Univ., Corvallis, OR (United States)
Univ. of Massachusetts, Amherst, MA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Soils represent the largest terrestrial reservoir of organic carbon, and the balance between soil organic carbon (SOC) formation and loss will drive powerful carbon-climate feedbacks over the coming century. To date, efforts to predict SOC dynamics have rested on pool-based models, which assume classes of SOC with internally homogenous physicochemical properties. However, emerging evidence suggests that soil carbon turnover is not dominantly controlled by the chemistry of carbon inputs, but rather by restrictions on microbial access to organic matter in the spatially heterogeneous soil environment. The dynamic processes that control the physicochemical protection of carbon translate poorly to pool-based SOC models; as a result, we are challenged to mechanistically predict how environmental change will impact movement of carbon between soils and the atmosphere. In this study, we propose a novel conceptual framework to explore controls on belowground carbon cycling: Probabilistic Representation of Organic Matter Interactions within the Soil Environment (PROMISE). In contrast to traditional model frameworks, PROMISE does not attempt to define carbon pools united by common thermodynamic or functional attributes. Rather, the PROMISE concept considers how SOC cycling rates are governed by the stochastic processes that influence the proximity between microbial decomposers and organic matter, with emphasis on their physical location in the soil matrix. We illustrate the applications of this framework with a new biogeochemical simulation model that traces the fate of individual carbon atoms as they interact with their environment, undergoing biochemical transformations and moving through the soil pore space. We also discuss how the PROMISE framework reshapes dialogue around issues related to SOC management in a changing world. We intend the PROMISE framework to spur the development of new hypotheses, analytical tools, and model structures across disciplines that will illuminate mechanistic controls on the flow of carbon between plant, soil, and atmospheric pools.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

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

Grant/Contract Number:: AC05-00OR22725; AC02-06CH11357; AC52-07NA27344

OSTI ID:: 1731052

Alternate ID(s):: OSTI ID: 1782302
OSTI ID: 1787654
OSTI ID: 1867102
OSTI ID: 2570230

Journal Information:: Global Change Biology, Journal Name: Global Change Biology Journal Issue: 12 Vol. 26; ISSN 1354-1013

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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59 BASIC BIOLOGICAL SCIENCES
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From pools to flow: The PROMISE framework for new insights on soil carbon cycling in a changing world

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