Home About Browse Search
Svenska


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

Boye, Kristin and Herrmann, Anke and Schaefer, Michael and Tfaily, Malak M. and Fendorf, Scott (2018). Discerning Microbially Mediated Processes During Redox Transitions in Flooded Soils Using Carbon and Energy Balances. Frontiers in Environmental Science. 6 , 15
[Research article]

[img] PDF
2MB

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 (1.6-400 mg 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 (R-2 = 0.85), between CO2 and initial soluble C (R-2 = 0.91, excluding glucose treatment) and between heat output 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.

Authors/Creators:Boye, Kristin and Herrmann, Anke and Schaefer, Michael and Tfaily, Malak M. and Fendorf, Scott
Title:Discerning Microbially Mediated Processes During Redox Transitions in Flooded Soils Using Carbon and Energy Balances
Series Name/Journal:Frontiers in Environmental Science
Year of publishing :2018
Volume:6
Article number:15
Number of Pages:14
Publisher:FRONTIERS MEDIA SA
ISSN:2296-665X
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:soil carbon, microbial respiration, organic amendments, anaerobic metabolism, paddy soil, calorimetry, FT-ICR-MS
URN:NBN:urn:nbn:se:slu:epsilon-p-112440
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-112440
Additional ID:
Type of IDID
DOI10.3389/fenvs.2018.00015
Web of Science (WoS)000452106300001
ID Code:24577
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:21 Jun 2021 13:43
Metadata Last Modified:21 Jun 2021 13:51

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits