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Differences in substrate use efficiency: impacts of microbial community composition, land use management, and substrate complexity

Bölscher, Tobias and Wadsö, Lars and Börjesson, Gunnar and Herrmann, Anke (2016). Differences in substrate use efficiency: impacts of microbial community composition, land use management, and substrate complexity. Biology and fertility of soils. 52:4, 547-559
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Abstract

Microbial substrate use efficiency is an important property in process-based soil organic matter models, but is often assumed to be constant in mechanistic models. However, previous studies question if a constant efficiency is appropriate, in particular when evaluating carbon (C) cycling across temperatures and various substrates. In the present study, we evaluated the relation between substrate use efficiency, microbial community composition and substrate complexity in contrasting long-term management regimes (47-49 years of either arable, ley farming, grassland, or forest systems). Microbial community composition was assessed by phospholipid fatty acid analysis and three indices of substrate use efficiencies were considered: (i) thermodynamic efficiency, (ii) calorespirometric ratio, and (iii) metabolic quotient. Three substrates, d-glucose, l-alanine, or glycogen, varying in complexity, were added separately to soils, and heat production as well as C mineralization was determined over a 32-h incubation period at 12.5 A degrees C. Microbial communities from forest systems were most efficient in utilizing substrates, supporting our hypothesis that maturing ecosystems become more efficient. These changes in efficiency were linked to microbial community composition with fungi and Gram-negative bacteria being important biomarkers. Despite our initial hypothesis, complex substrate such as glycogen was utilized most efficiently. Our findings emphasize that differences in land use management systems as well as the composition of soil organic matter need to be considered when modelling C dynamics in soils. Further research is required to establish and evaluate appropriate proxies for substrate use efficiencies in various ecosystems.

Authors/Creators:Bölscher, Tobias and Wadsö, Lars and Börjesson, Gunnar and Herrmann, Anke
Title:Differences in substrate use efficiency: impacts of microbial community composition, land use management, and substrate complexity
Series/Journal:Biology and fertility of soils (0178-2762)
Year of publishing :2016
Depositing date:30 August 2016
Volume:52
Number:4
Page range:547-559
Number of Pages:13
Publisher:Springer
ISSN:0178-2762
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Public
Agris subject categories.:P Natural resources > P33 Soil chemistry and physics
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Agrovoc terms:microbial ecology, land use, soil organic matter, calorimetry
Keywords:Microbial carbon use efficiency, Microbial community, Land use, Substrate complexity, Isothermal calorimetry
URN:NBN:urn:nbn:se:slu:epsilon-e-3757
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3757
Additional ID:
Type of IDID
Web of Science (WoS)000374659400011
DOI10.1007/s00374-016-1097-5
ID Code:13606
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment

(NL, NJ) > Department of Chemistry and Biotechnology (140101-161231)
Deposited By: SLUpub Connector
Deposited On:02 Nov 2016 11:53
Metadata Last Modified:23 Feb 2017 00:15

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