Cited by 29Soil Carbon and Nitrogen DynamicsSoil and Unsaturated FlowMycorrhizal Fungi and Plant Interactions

Temperature response of wheat decomposition is more complex than the common approaches of most multi-pool models

Bauer, J., Kirschbaum, M.U.F., Weihermüller, L., Huisman, J.A., Herbst, M., Vereecken, H.·2008·Soil Biology and Biochemistry

Abstract

The temperature response of heterotrophic soil respiration is crucial for a reliable prediction of carbon dynamics in response to climatic changes. Most multi-pool models describe the temperature dependence of carbon decomposition by a response function which uniformly scales the decomposition constants of all carbon pools. However, it is not clear whether the temperature response does, indeed, conform to such a simple formulation. In this study, we analysed measured CO2 efflux from wheat decomposition experiments under six different temperatures (5, 9, 15, 25, 35 and 45 °C). Data were interpreted by assuming that litter could be sub-divided into two pools, a labile and a more recalcitrant one, that would each decay exponentially. We found that the observed patterns of carbon loss were poorly described if we used the same relative temperature response functions for the decomposition of both pools and assumed the same chemical recalcitrance (expressed as the ratio of labile and recalcitrant pool sizes) at all temperatures. Data prediction could be significantly improved by using different temperature response functions for the decomposition of the two different organic matter fractions. Even better data prediction could be achieved by assuming that chemical recalcitrance varied with temperature. The data could also be well described by the more sophisticated carbon-dynamic models RothC and CenW/CENTURY, again, provided that the ratio of litter fractions in the initial input material was modified with temperature. Our findings thus suggest that the temperature dependence of organic matter decomposition cannot be fully described with the simple approaches usually employed but that there is a more complicated interplay between the temperature dependence of decomposition rates and temperature effects on the chemical recalcitrance of different organic matter fractions.

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Crossref · 10.1016/j.soilbio.2008.07.024

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  • Environmental variables such as soil water dynamics, temperature, litter incorporation, dissolved organic carbon transport and nitrogen affect carbon cycling under perennial vegetation.

    “Environmental variables, such as soil water dynamics [40], temperature [38, 41], litter incorporation and dissolved organic C (DOC) transport [42] and nitrogen [14, 43], affect C cycling under perennial vegetation.”
  • Litter rich in lignin and poor in nitrogen is more sensitive to temperature changes than protein-rich litter, as shown for Miscanthus residues.

    “Litter rich in lignin and poor in N was more sensitive to temperature changes than protein-rich litter [38] as shown for Miscanthus residues [108, 114].”

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Authors
Bauer, J., Kirschbaum, M. U. F., Weihermüller, L., Huisman, J. A., Herbst, M., & Vereecken, H.
Affiliations
  • Forschungszentrum Jülich (DE)
  • Manaaki Whenua – Landcare Research (NZ)
Corresponding author
Bauer, J.
Venue
Soil Biology and Biochemistry
Publisher
Elsevier BV
Published
2008-11
Volume
40
Issue
11
Pages
2780-2786
ISSN
0038-0717 (ISSN-L)
OpenAlex
W2071084884
Cited by
29
References
30
Citations by year
2020: 2 · 2019: 1 · 2018: 3 · 2017: 6 · 2016: 1 · 2015: 1 · 2014: 3 · 2013: 1 · 2012: 5
FWCI
3.04
Type
journal article
Language
en
Open access
closed
Locations
  • Soil Biology and Biochemistry (publishedVersion)
  • JuSER (Forschungszentrum Jülich) (submittedVersion)
Funders
Innovative Research Group Project of the National Natural Science Foundation of China
Topics
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
  • Physical Sciences › Engineering › Civil and Structural Engineering › Soil and Unsaturated Flow
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Mycorrhizal Fungi and Plant Interactions
Keywords
temperature sensitivity, soil heterotrophic respiration, temperature response functions, CO2 efflux, RothC, CENTURY model, soil organic matter decomposition

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