Stoichiometrically coupled carbon and nitrogen cycling in the MIcrobial-MIneral Carbon Stabilization model version 1.0 (MIMICS-CN v1.0)
<p>Explicit consideration of microbial physiology in soil biogeochemical models that represent coupled carbon–nitrogen dynamics presents opportunities to deepen understanding of ecosystem responses to environmental change. The MIcrobial-MIneral Carbon Stabilization (MIMICS) model explicitly re...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2020-09-01
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| Series: | Geoscientific Model Development |
| Online Access: | https://gmd.copernicus.org/articles/13/4413/2020/gmd-13-4413-2020.pdf |
| _version_ | 1819114888746762240 |
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| author | E. Kyker-Snowman W. R. Wieder W. R. Wieder S. D. Frey A. S. Grandy |
| author_facet | E. Kyker-Snowman W. R. Wieder W. R. Wieder S. D. Frey A. S. Grandy |
| author_sort | E. Kyker-Snowman |
| collection | DOAJ |
| description | <p>Explicit consideration of microbial physiology in soil
biogeochemical models that represent coupled carbon–nitrogen dynamics
presents opportunities to deepen understanding of ecosystem responses to
environmental change. The MIcrobial-MIneral Carbon Stabilization (MIMICS)
model explicitly represents microbial physiology and physicochemical
stabilization of soil carbon (C) on regional and global scales. Here we
present a new version of MIMICS with coupled C and nitrogen (N) cycling
through litter, microbial, and soil organic matter (SOM) pools. The model
was parameterized and validated against C and N data from the Long-Term
Inter-site Decomposition Experiment Team (LIDET; six litter types, 10 years of
observations, and 13 sites across North America). The model simulates C and N
losses from litterbags in the LIDET study with reasonable accuracy (C:
<span class="inline-formula"><i>R</i><sup>2</sup>=0.63</span>; N: <span class="inline-formula"><i>R</i><sup>2</sup>=0.29</span>), which is comparable with simulations
from the DAYCENT model that implicitly represents microbial activity (C:
<span class="inline-formula"><i>R</i><sup>2</sup>=0.67</span>; N: <span class="inline-formula"><i>R</i><sup>2</sup>=0.30</span>). Subsequently, we evaluated equilibrium
values of stocks (total soil C and N, microbial biomass C and N, inorganic
N) and microbial process rates (soil heterotrophic respiration, N
mineralization) simulated by MIMICS-CN across the 13 simulated LIDET sites
against published observations from other continent-wide datasets. We found
that MIMICS-CN produces equilibrium values in line with measured values,
showing that the model generates plausible estimates of ecosystem soil
biogeochemical dynamics across continental-scale gradients. MIMICS-CN
provides a platform for coupling C and N projections in a microbially explicit
model, but experiments still need to identify the physiological and
stoichiometric characteristics of soil microbes, especially under
environmental change scenarios.</p> |
| first_indexed | 2024-12-22T04:52:27Z |
| format | Article |
| id | doaj.art-6df38e787a40485baf2c5a943d0cedfe |
| institution | Directory Open Access Journal |
| issn | 1991-959X 1991-9603 |
| language | English |
| last_indexed | 2024-12-22T04:52:27Z |
| publishDate | 2020-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Geoscientific Model Development |
| spelling | doaj.art-6df38e787a40485baf2c5a943d0cedfe2022-12-21T18:38:27ZengCopernicus PublicationsGeoscientific Model Development1991-959X1991-96032020-09-01134413443410.5194/gmd-13-4413-2020Stoichiometrically coupled carbon and nitrogen cycling in the MIcrobial-MIneral Carbon Stabilization model version 1.0 (MIMICS-CN v1.0)E. Kyker-Snowman0W. R. Wieder1W. R. Wieder2S. D. Frey3A. S. Grandy4Department of Natural Resources and the Environment, University of New Hampshire, Durham, NH 03824, USAClimate and Global Dynamics Laboratory, National Center for Atmospheric Research, Boulder, CO 80305, USAInstitute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80309, USADepartment of Natural Resources and the Environment, University of New Hampshire, Durham, NH 03824, USADepartment of Natural Resources and the Environment, University of New Hampshire, Durham, NH 03824, USA<p>Explicit consideration of microbial physiology in soil biogeochemical models that represent coupled carbon–nitrogen dynamics presents opportunities to deepen understanding of ecosystem responses to environmental change. The MIcrobial-MIneral Carbon Stabilization (MIMICS) model explicitly represents microbial physiology and physicochemical stabilization of soil carbon (C) on regional and global scales. Here we present a new version of MIMICS with coupled C and nitrogen (N) cycling through litter, microbial, and soil organic matter (SOM) pools. The model was parameterized and validated against C and N data from the Long-Term Inter-site Decomposition Experiment Team (LIDET; six litter types, 10 years of observations, and 13 sites across North America). The model simulates C and N losses from litterbags in the LIDET study with reasonable accuracy (C: <span class="inline-formula"><i>R</i><sup>2</sup>=0.63</span>; N: <span class="inline-formula"><i>R</i><sup>2</sup>=0.29</span>), which is comparable with simulations from the DAYCENT model that implicitly represents microbial activity (C: <span class="inline-formula"><i>R</i><sup>2</sup>=0.67</span>; N: <span class="inline-formula"><i>R</i><sup>2</sup>=0.30</span>). Subsequently, we evaluated equilibrium values of stocks (total soil C and N, microbial biomass C and N, inorganic N) and microbial process rates (soil heterotrophic respiration, N mineralization) simulated by MIMICS-CN across the 13 simulated LIDET sites against published observations from other continent-wide datasets. We found that MIMICS-CN produces equilibrium values in line with measured values, showing that the model generates plausible estimates of ecosystem soil biogeochemical dynamics across continental-scale gradients. MIMICS-CN provides a platform for coupling C and N projections in a microbially explicit model, but experiments still need to identify the physiological and stoichiometric characteristics of soil microbes, especially under environmental change scenarios.</p>https://gmd.copernicus.org/articles/13/4413/2020/gmd-13-4413-2020.pdf |
| spellingShingle | E. Kyker-Snowman W. R. Wieder W. R. Wieder S. D. Frey A. S. Grandy Stoichiometrically coupled carbon and nitrogen cycling in the MIcrobial-MIneral Carbon Stabilization model version 1.0 (MIMICS-CN v1.0) Geoscientific Model Development |
| title | Stoichiometrically coupled carbon and nitrogen cycling in the MIcrobial-MIneral Carbon Stabilization model version 1.0 (MIMICS-CN v1.0) |
| title_full | Stoichiometrically coupled carbon and nitrogen cycling in the MIcrobial-MIneral Carbon Stabilization model version 1.0 (MIMICS-CN v1.0) |
| title_fullStr | Stoichiometrically coupled carbon and nitrogen cycling in the MIcrobial-MIneral Carbon Stabilization model version 1.0 (MIMICS-CN v1.0) |
| title_full_unstemmed | Stoichiometrically coupled carbon and nitrogen cycling in the MIcrobial-MIneral Carbon Stabilization model version 1.0 (MIMICS-CN v1.0) |
| title_short | Stoichiometrically coupled carbon and nitrogen cycling in the MIcrobial-MIneral Carbon Stabilization model version 1.0 (MIMICS-CN v1.0) |
| title_sort | stoichiometrically coupled carbon and nitrogen cycling in the microbial mineral carbon stabilization model version 1 0 mimics cn v1 0 |
| url | https://gmd.copernicus.org/articles/13/4413/2020/gmd-13-4413-2020.pdf |
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