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Title: Discerning Microbially Mediated Processes During Redox Transitions in Flooded Soils Using Carbon and Energy Balances

Abstract

Recurring dry-wet cycles of soils, such as in rice paddies and on floodplains, have a dramatic impact on biogeochemical processes. The rates and trajectories of microbial metabolic functions during transition periods from drained to flooded conditions affect the transformation rates and phase partitioning of carbon, nutrients, and contaminants. However, the regulating mechanisms responsible for diverging functional metabolisms during such transitions are poorly resolved. The chemistry of organic carbon within the microbially available pool likely holds key information regarding carbon cycling and redox transformation rates. In this study, we used mesocosms to examine the influence of different carbon sources (glucose, straw, manure, char) on microbial energetics, respiration rates, and carbon balances in rice paddy soils during the transition from drained to flooded conditions following inundation. We found that variability in carbon solubility (1.6–400mg g -1) and chemical composition of the amendments led to non-uniform stimulation of carbon dioxide production per unit carbon added (0.4–32.9 mmol CO 2 mol -1 added C). However, there was a clear linear correlation between energy release and net CO 2 production rate ( R 2 = 0.85), between CO 2 and initial soluble C ( R 2 = 0.91, excluding glucose treatment) and between heat outputmore » and Gibbs free energy of initial soluble C ( R 2 = 0.78 and 0.69, with/without glucose respectively). Our results further indicated that the chemical composition of the soluble C from amendments initiated divergent anaerobic respiration behavior, impacting methane production and the partitioning of elements between soil solid phase and solution. This study shows the benefit of monitoring energy and element mass balances for elucidating the contribution of various microbial metabolic functions in complex systems. Further, our results highlight the importance of organic carbon composition within the water soluble pool as a key driver of microbially mediated redox transformations with major impacts on greenhouse gas emissions, contaminant fate, and nutrient cycling in paddy soils and similar ecosystems.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1435980
Alternate Identifier(s):
OSTI ID: 1527010
Report Number(s):
[PNNL-SA-134588]
[Journal ID: ISSN 2296-665X; 15]
Grant/Contract Number:  
[SLAC FWP 10094; FG02-13ER65542; SC0016544; AC05-76RL01830]
Resource Type:
Published Article
Journal Name:
Frontiers in Environmental Science
Additional Journal Information:
[Journal Name: Frontiers in Environmental Science Journal Volume: 6]; Journal ID: ISSN 2296-665X
Publisher:
Frontiers Media SA
Country of Publication:
Switzerland
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; soil carbon; microbial respiration; organic amendments; anaerobic metabolism; paddy soil

Citation Formats

Boye, Kristin, Herrmann, Anke M., Schaefer, Michael V., Tfaily, Malak M., and Fendorf, Scott. Discerning Microbially Mediated Processes During Redox Transitions in Flooded Soils Using Carbon and Energy Balances. Switzerland: N. p., 2018. Web. doi:10.3389/fenvs.2018.00015.
Boye, Kristin, Herrmann, Anke M., Schaefer, Michael V., Tfaily, Malak M., & Fendorf, Scott. Discerning Microbially Mediated Processes During Redox Transitions in Flooded Soils Using Carbon and Energy Balances. Switzerland. doi:10.3389/fenvs.2018.00015.
Boye, Kristin, Herrmann, Anke M., Schaefer, Michael V., Tfaily, Malak M., and Fendorf, Scott. Fri . "Discerning Microbially Mediated Processes During Redox Transitions in Flooded Soils Using Carbon and Energy Balances". Switzerland. doi:10.3389/fenvs.2018.00015.
@article{osti_1435980,
title = {Discerning Microbially Mediated Processes During Redox Transitions in Flooded Soils Using Carbon and Energy Balances},
author = {Boye, Kristin and Herrmann, Anke M. and Schaefer, Michael V. and Tfaily, Malak M. and Fendorf, Scott},
abstractNote = {Recurring dry-wet cycles of soils, such as in rice paddies and on floodplains, have a dramatic impact on biogeochemical processes. The rates and trajectories of microbial metabolic functions during transition periods from drained to flooded conditions affect the transformation rates and phase partitioning of carbon, nutrients, and contaminants. However, the regulating mechanisms responsible for diverging functional metabolisms during such transitions are poorly resolved. The chemistry of organic carbon within the microbially available pool likely holds key information regarding carbon cycling and redox transformation rates. In this study, we used mesocosms to examine the influence of different carbon sources (glucose, straw, manure, char) on microbial energetics, respiration rates, and carbon balances in rice paddy soils during the transition from drained to flooded conditions following inundation. We found that variability in carbon solubility (1.6–400mg g-1) and chemical composition of the amendments led to non-uniform stimulation of carbon dioxide production per unit carbon added (0.4–32.9 mmol CO2 mol-1 added C). However, there was a clear linear correlation between energy release and net CO2 production rate (R2 = 0.85), between CO2 and initial soluble C (R2 = 0.91, excluding glucose treatment) and between heat output and Gibbs free energy of initial soluble C (R2 = 0.78 and 0.69, with/without glucose respectively). Our results further indicated that the chemical composition of the soluble C from amendments initiated divergent anaerobic respiration behavior, impacting methane production and the partitioning of elements between soil solid phase and solution. This study shows the benefit of monitoring energy and element mass balances for elucidating the contribution of various microbial metabolic functions in complex systems. Further, our results highlight the importance of organic carbon composition within the water soluble pool as a key driver of microbially mediated redox transformations with major impacts on greenhouse gas emissions, contaminant fate, and nutrient cycling in paddy soils and similar ecosystems.},
doi = {10.3389/fenvs.2018.00015},
journal = {Frontiers in Environmental Science},
number = ,
volume = [6],
place = {Switzerland},
year = {2018},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.3389/fenvs.2018.00015

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Cited by: 1 work
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Figures / Tables:

TABLE 1 TABLE 1: Soil and amendment properties.

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