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Title: Temporal dynamics of CO 2 and CH 4 loss potentials in response to rapid hydrological shifts in tidal freshwater wetland soils

Abstract

Earth System Models predict climate extremes that will impact regional and global hydrology. Aquatic-terrestrial transition zones like wetlands are subjected to the immediate consequence of climate change with shifts in the magnitude and dynamics of hydrologic flow. Such fluctuating hydrology can alter the nature and rate of biogeochemical transformations and significantly impact the carbon balance of the ecosystem. We tested the impacts of fluctuating hydrology and, specifically, the role of antecedent moisture conditions in determining the dominant carbon loss mechanisms in soils sampled from a tidal freshwater wetland system in the lower Columbia River, WA, USA. Our objective was to understand shifts in biogeochemical processes in response to changing soil moisture, based on soil respiration and methane production rates, and to elucidate such responses based on the observed electron acceptor and metabolite profiles under laboratory conditions. Metabolomics and biogeochemical process rates provided evidence that soil redox was the principal factor driving metabolic function. Fluctuating redox conditions altered terminal electron acceptor and donor availability and recovery strengths of their concentrations in soil such that a disproportionate release of carbon dioxide stemmed from alternative anaerobic degradation processes like sulfate and iron reduction compared to carbon loss due to methano genesis. Our resultsmore » show that extended and short-term saturation created conditions conducive to increasing metabolite availability for anaerobic decomposition processes, with a significant lag in methanogenesis. In contrast,extended drying caused a cellular-level stress response and rapid recycling of alternate electron acceptors.« less

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1494296
Report Number(s):
PNNL-SA-123359
Journal ID: ISSN 0925-8574
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Ecological Engineering
Additional Journal Information:
Journal Volume: 114; Journal Issue: C; Journal ID: ISSN 0925-8574
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
anaerobic respiration, tidal wetlands, methane production, sulfate reduction, iron reduction, soil metabolites

Citation Formats

RoyChowdhury, Taniya, Bramer, Lisa, Hoyt, David W., Kim, Young-Mo, Metz, Thomas O., McCue, Lee Ann, Diefenderfer, Heida L., Jansson, Janet K., and Bailey, Vanessa. Temporal dynamics of CO2 and CH4 loss potentials in response to rapid hydrological shifts in tidal freshwater wetland soils. United States: N. p., 2018. Web. doi:10.1016/j.ecoleng.2017.06.041.
RoyChowdhury, Taniya, Bramer, Lisa, Hoyt, David W., Kim, Young-Mo, Metz, Thomas O., McCue, Lee Ann, Diefenderfer, Heida L., Jansson, Janet K., & Bailey, Vanessa. Temporal dynamics of CO2 and CH4 loss potentials in response to rapid hydrological shifts in tidal freshwater wetland soils. United States. doi:10.1016/j.ecoleng.2017.06.041.
RoyChowdhury, Taniya, Bramer, Lisa, Hoyt, David W., Kim, Young-Mo, Metz, Thomas O., McCue, Lee Ann, Diefenderfer, Heida L., Jansson, Janet K., and Bailey, Vanessa. Sun . "Temporal dynamics of CO2 and CH4 loss potentials in response to rapid hydrological shifts in tidal freshwater wetland soils". United States. doi:10.1016/j.ecoleng.2017.06.041.
@article{osti_1494296,
title = {Temporal dynamics of CO2 and CH4 loss potentials in response to rapid hydrological shifts in tidal freshwater wetland soils},
author = {RoyChowdhury, Taniya and Bramer, Lisa and Hoyt, David W. and Kim, Young-Mo and Metz, Thomas O. and McCue, Lee Ann and Diefenderfer, Heida L. and Jansson, Janet K. and Bailey, Vanessa},
abstractNote = {Earth System Models predict climate extremes that will impact regional and global hydrology. Aquatic-terrestrial transition zones like wetlands are subjected to the immediate consequence of climate change with shifts in the magnitude and dynamics of hydrologic flow. Such fluctuating hydrology can alter the nature and rate of biogeochemical transformations and significantly impact the carbon balance of the ecosystem. We tested the impacts of fluctuating hydrology and, specifically, the role of antecedent moisture conditions in determining the dominant carbon loss mechanisms in soils sampled from a tidal freshwater wetland system in the lower Columbia River, WA, USA. Our objective was to understand shifts in biogeochemical processes in response to changing soil moisture, based on soil respiration and methane production rates, and to elucidate such responses based on the observed electron acceptor and metabolite profiles under laboratory conditions. Metabolomics and biogeochemical process rates provided evidence that soil redox was the principal factor driving metabolic function. Fluctuating redox conditions altered terminal electron acceptor and donor availability and recovery strengths of their concentrations in soil such that a disproportionate release of carbon dioxide stemmed from alternative anaerobic degradation processes like sulfate and iron reduction compared to carbon loss due to methano genesis. Our results show that extended and short-term saturation created conditions conducive to increasing metabolite availability for anaerobic decomposition processes, with a significant lag in methanogenesis. In contrast,extended drying caused a cellular-level stress response and rapid recycling of alternate electron acceptors.},
doi = {10.1016/j.ecoleng.2017.06.041},
journal = {Ecological Engineering},
issn = {0925-8574},
number = C,
volume = 114,
place = {United States},
year = {2018},
month = {4}
}