In:
PLOS ONE, Public Library of Science (PLoS), Vol. 16, No. 6 ( 2021-6-10), p. e0252881-
Abstract:
Liquid manure (slurry) from livestock releases methane (CH 4 ) that contributes significantly to global warming. Existing models for slurry CH 4 production—used for mitigation and inventories—include effects of organic matter loading, temperature, and retention time but cannot predict important effects of management, or adequately capture essential temperature-driven dynamics. Here we present a new model that includes multiple methanogenic groups whose relative abundance shifts in response to changes in temperature or other environmental conditions. By default, the temperature responses of five groups correspond to those of four methanogenic species and one uncultured methanogen, although any number of groups could be defined. We argue that this simple mechanistic approach is able to describe both short- and long-term responses to temperature where other existing approaches fall short. The model is available in the open-source R package ABM ( https://github.com/sashahafner/ABM ) as a single flexible function that can include effects of slurry management (e.g., removal frequency and treatment methods) and changes in environmental conditions over time. Model simulations suggest that the reduction of CH 4 emission by frequent emptying of slurry pits is due to washout of active methanogens. Application of the model to represent a full-scale slurry storage tank showed it can reproduce important trends, including a delayed response to temperature changes. However, the magnitude of predicted emission is uncertain, primarily as a result of sensitivity to the hydrolysis rate constant, due to a wide range in reported values. Results indicated that with additional work—particularly on the magnitude of hydrolysis rate—the model could be a tool for estimation of CH 4 emissions for inventories.
Type of Medium:
Online Resource
ISSN:
1932-6203
DOI:
10.1371/journal.pone.0252881
DOI:
10.1371/journal.pone.0252881.g001
DOI:
10.1371/journal.pone.0252881.g002
DOI:
10.1371/journal.pone.0252881.g003
DOI:
10.1371/journal.pone.0252881.g004
DOI:
10.1371/journal.pone.0252881.g005
DOI:
10.1371/journal.pone.0252881.g006
DOI:
10.1371/journal.pone.0252881.g007
DOI:
10.1371/journal.pone.0252881.g008
DOI:
10.1371/journal.pone.0252881.g009
DOI:
10.1371/journal.pone.0252881.t001
DOI:
10.1371/journal.pone.0252881.t002
DOI:
10.1371/journal.pone.0252881.s001
DOI:
10.1371/journal.pone.0252881.s002
DOI:
10.1371/journal.pone.0252881.s003
DOI:
10.1371/journal.pone.0252881.s004
DOI:
10.1371/journal.pone.0252881.s005
DOI:
10.1371/journal.pone.0252881.s006
Language:
English
Publisher:
Public Library of Science (PLoS)
Publication Date:
2021
detail.hit.zdb_id:
2267670-3
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