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Title: On the role of soil water retention characteristic on aerobic microbial respiration

Abstract

Soil water status is one of the most important environmental factors that control microbial activity and rate of soil organic matter (SOM) decomposition. Its effect can be partitioned into effect of water energy status (water potential) on cellular activity, effect of water volume on cellular motility, and aqueous diffusion of substrate and nutrients, as well as the effect of air content and gas-diffusion pathways on concentration of dissolved oxygen. Nonetheless,moisture functions widely used in SOM decomposition models are often based on empirical functions rather than robust physical foundations that account for these disparate impacts of soil water. The contributions of soil water content and water potential varyfrom soil to soil according to the soil water characteristic (SWC), which in turn is strongly dependent on soil texture and structure. The overall goal of this study is to introduce a physically based modeling framework of aerobic microbial respiration that incorporates the role of SWC under arbitrary soil moisture status. The model was tested by contrasting it with published data sets of SOM decomposition under laboratory conditions.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of California, Merced, CA (United States)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1505309
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Biogeosciences (Online)
Additional Journal Information:
Journal Name: Biogeosciences (Online); Journal Volume: 16; Journal Issue: 6; Journal ID: ISSN 1726-4189
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Ghezzehei, Teamrat A., Sulman, Benjamin, Arnold, Chelsea L., Bogie, Nathaniel A., and Berhe, Asmeret Asefaw. On the role of soil water retention characteristic on aerobic microbial respiration. United States: N. p., 2019. Web. doi:10.5194/bg-16-1187-2019.
Ghezzehei, Teamrat A., Sulman, Benjamin, Arnold, Chelsea L., Bogie, Nathaniel A., & Berhe, Asmeret Asefaw. On the role of soil water retention characteristic on aerobic microbial respiration. United States. doi:10.5194/bg-16-1187-2019.
Ghezzehei, Teamrat A., Sulman, Benjamin, Arnold, Chelsea L., Bogie, Nathaniel A., and Berhe, Asmeret Asefaw. Thu . "On the role of soil water retention characteristic on aerobic microbial respiration". United States. doi:10.5194/bg-16-1187-2019. https://www.osti.gov/servlets/purl/1505309.
@article{osti_1505309,
title = {On the role of soil water retention characteristic on aerobic microbial respiration},
author = {Ghezzehei, Teamrat A. and Sulman, Benjamin and Arnold, Chelsea L. and Bogie, Nathaniel A. and Berhe, Asmeret Asefaw},
abstractNote = {Soil water status is one of the most important environmental factors that control microbial activity and rate of soil organic matter (SOM) decomposition. Its effect can be partitioned into effect of water energy status (water potential) on cellular activity, effect of water volume on cellular motility, and aqueous diffusion of substrate and nutrients, as well as the effect of air content and gas-diffusion pathways on concentration of dissolved oxygen. Nonetheless,moisture functions widely used in SOM decomposition models are often based on empirical functions rather than robust physical foundations that account for these disparate impacts of soil water. The contributions of soil water content and water potential varyfrom soil to soil according to the soil water characteristic (SWC), which in turn is strongly dependent on soil texture and structure. The overall goal of this study is to introduce a physically based modeling framework of aerobic microbial respiration that incorporates the role of SWC under arbitrary soil moisture status. The model was tested by contrasting it with published data sets of SOM decomposition under laboratory conditions.},
doi = {10.5194/bg-16-1187-2019},
journal = {Biogeosciences (Online)},
number = 6,
volume = 16,
place = {United States},
year = {2019},
month = {3}
}

Journal Article:
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