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Generic parameters of first-order kinetics accurately describe soil organic matter decay in bare fallow soils over a wide edaphic and climatic range

Menichetti, Lorenzo and Ågren, Göran and Barré, Pierre and Moyano, Fernando Esteban and Kätterer, Thomas (2019). Generic parameters of first-order kinetics accurately describe soil organic matter decay in bare fallow soils over a wide edaphic and climatic range. Scientific Reports. 9 , 1-12
[Journal article]

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Abstract

The conventional soil organic matter (SOM) decay paradigm considers the intrinsic quality of SOM as the dominant decay limitation with the result that it is modelled using simple first-order decay kinetics. This view and modelling approach is often criticized for being too simplistic and unreliable for predictive purposes. It is still under debate if first-order models can correctly capture the variability in temporal SOM decay observed between different agroecosystems and climates. To address this question, we calibrated a first-order model (Q) on six long-term bare fallow field experiments across Europe. Following conventional SOM decay theory, we assumed that parameters directly describing SOC decay (rate of SOM quality change and decomposer metabolism) are thermodynamically constrained and therefore valid for all sites. Initial litter input quality and edaphic interactions (both local by definition) and microbial efficiency (possibly affected by nutrient stoichiometry) were instead considered site-specific. Initial litter input quality explained most observed kinetics variability, and the model predicted a convergence toward a common kinetics over time. Site-specific variables played no detectable role. The decay of decades-old SOM seemed mostly influenced by OM chemistry and was well described by first order kinetics and a single set of general kinetics parameters.

Authors/Creators:Menichetti, Lorenzo and Ågren, Göran and Barré, Pierre and Moyano, Fernando Esteban and Kätterer, Thomas
Title:Generic parameters of first-order kinetics accurately describe soil organic matter decay in bare fallow soils over a wide edaphic and climatic range
Year of publishing :2019
Volume:9
Page range:1-12
Number of Pages:12
Publisher:Springer Nature
ISSN:2045-2322
Language:English
Publication Type:Journal article
Refereed:Yes
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 > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Keywords:Soil organic carbon (SOC), surface carbon, soil organic matter (SOM), carbon sequestration, climate change mitigation, agroecosystems, carbon dynamics
URN:NBN:urn:nbn:se:slu:epsilon-p-103971
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-103971
Additional ID:
Type of IDID
DOI10.1038/s41598-019-55058-1
Web of Science (WoS)000508985100002
ID Code:16686
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: SLUpub Connector
Deposited On:06 Mar 2020 09:34
Metadata Last Modified:06 Mar 2020 09:34

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