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Mineralization of low molecular weight carbon substrates in soil solution under laboratory and field conditions

Glanville, H.; Rousk, Johannes LU ; Golyshin, P. and Jones, D. L. (2012) In Soil Biology & Biochemistry 48. p.88-95
Abstract
A more detailed mechanistic understanding of how low molecular weight (MW) carbon (C) substrates are mineralized within the rhizosphere by soil microbial communities is crucial to accurately model terrestrial C fluxes. Currently, most experiments regarding soil C dynamics are conducted ex-situ (laboratory) and can fail to account for key variables (e.g. temperature and soil water content) which vary in-situ. In addition, ex-situ experiments are often highly invasive, e.g. severing root and mycorrhizal networks, changing the input and concentrations of low MW exudates within soil. The aim of this study was to directly compare the mineralization rates of 31 common low MW C substrates under ex- and in-situ conditions. In addition, we also... (More)
A more detailed mechanistic understanding of how low molecular weight (MW) carbon (C) substrates are mineralized within the rhizosphere by soil microbial communities is crucial to accurately model terrestrial C fluxes. Currently, most experiments regarding soil C dynamics are conducted ex-situ (laboratory) and can fail to account for key variables (e.g. temperature and soil water content) which vary in-situ. In addition, ex-situ experiments are often highly invasive, e.g. severing root and mycorrhizal networks, changing the input and concentrations of low MW exudates within soil. The aim of this study was to directly compare the mineralization rates of 31 common low MW C substrates under ex- and in-situ conditions. In addition, we also assessed the inter-annual field variability of substrate mineralization rates. We added trace concentrations of 31 individual C-14-labelled common low MW C substrates into the top soil of an agricultural grassland and monitored the mineralization rates by capturing (CO2)-C-14 evolved from the soil over 7 d. Our results showed that the contribution of low MW C components to soil respiration was highly reproducible between parallel studies performed either in-situ or ex-situ. We also found that differences in the mineralization of individual compounds were more variable inter-annually in the field than between the laboratory and the field. Our results suggest that laboratory-based C mineralization data can be used to reliably parameterize C models but that multiple experimental measurements should be made over time to reduce uncertainty in model parameter estimation. (C) 2012 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Decomposition, Dissolved organic carbon, DOC, SOM, Turnover rates
in
Soil Biology & Biochemistry
volume
48
pages
88 - 95
publisher
Elsevier
external identifiers
  • wos:000302449200011
  • scopus:84863419789
ISSN
0038-0717
DOI
10.1016/j.soilbio.2012.01.015
project
Microbial carbon-use efficiency
Carbon drivers and microbial agents of soil respiration
BECC
language
English
LU publication?
yes
id
56717f53-d9bd-47b9-b312-2b466cd37fdf (old id 2571558)
date added to LUP
2012-06-04 11:23:34
date last changed
2017-10-22 04:20:58
@article{56717f53-d9bd-47b9-b312-2b466cd37fdf,
  abstract     = {A more detailed mechanistic understanding of how low molecular weight (MW) carbon (C) substrates are mineralized within the rhizosphere by soil microbial communities is crucial to accurately model terrestrial C fluxes. Currently, most experiments regarding soil C dynamics are conducted ex-situ (laboratory) and can fail to account for key variables (e.g. temperature and soil water content) which vary in-situ. In addition, ex-situ experiments are often highly invasive, e.g. severing root and mycorrhizal networks, changing the input and concentrations of low MW exudates within soil. The aim of this study was to directly compare the mineralization rates of 31 common low MW C substrates under ex- and in-situ conditions. In addition, we also assessed the inter-annual field variability of substrate mineralization rates. We added trace concentrations of 31 individual C-14-labelled common low MW C substrates into the top soil of an agricultural grassland and monitored the mineralization rates by capturing (CO2)-C-14 evolved from the soil over 7 d. Our results showed that the contribution of low MW C components to soil respiration was highly reproducible between parallel studies performed either in-situ or ex-situ. We also found that differences in the mineralization of individual compounds were more variable inter-annually in the field than between the laboratory and the field. Our results suggest that laboratory-based C mineralization data can be used to reliably parameterize C models but that multiple experimental measurements should be made over time to reduce uncertainty in model parameter estimation. (C) 2012 Elsevier Ltd. All rights reserved.},
  author       = {Glanville, H. and Rousk, Johannes and Golyshin, P. and Jones, D. L.},
  issn         = {0038-0717},
  keyword      = {Decomposition,Dissolved organic carbon,DOC,SOM,Turnover rates},
  language     = {eng},
  pages        = {88--95},
  publisher    = {Elsevier},
  series       = {Soil Biology & Biochemistry},
  title        = {Mineralization of low molecular weight carbon substrates in soil solution under laboratory and field conditions},
  url          = {http://dx.doi.org/10.1016/j.soilbio.2012.01.015},
  volume       = {48},
  year         = {2012},
}