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Cited by 251Soil Carbon and Nitrogen DynamicsMycorrhizal Fungi and Plant InteractionsMicrobial Community Ecology and Physiology

Fast turnover of low molecular weight components of the dissolved organic carbon pool of temperate grassland field soils

BODDY, E, HILL, P, FARRAR, J, JONES, D·2007·Soil Biology and Biochemistry
DOI 10.1016/j.soilbio.2006.09.030
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Abstract

Large amounts of low molecular weight (LMW;<250 Da) carbon (C) are lost from roots into the rhizosphere as a consequence of root turnover and exudation. Their rates of turnover after release into the soil remain poorly understood. We extracted soil solution from a temperate grassland Eutric Cambisol, isotopically labeled the glucose and amino acid components, and then re-injected the solution back into the soil. We followed the subsequent evolution of ¹⁴CO₂ and incorporation of the LMW C into the soil microbial biomass or grasses for 48 h. The experiments were performed both on grazed and un-grazed swards in the field, and in the laboratory. In the field, we showed that glucose and amino acids had short half-lives (t(1/2)) in soil solution (t(1/2)=20-40 min), but that they persisted in soil microbes for much longer. A first-order double exponential model fitted the experimental data well and gave rate constant (k) values of 1.21-2.14 h⁻¹ for k₁ and 0.0025-0.0048 h⁻¹ for k₂. Only small amounts of the added ¹⁴C were recovered in plant biomass (<5% of total added to soil) indicating that plant roots are poor competitors for LMW dissolved organic C (DOC) in comparison to soil microorganisms. The first phase of glucose and amino acid mineralization in the laboratory was slower (t(1/2)=40-60 min) than measured in the field reinforcing the importance of making flux measurements in situ. Whilst grazing stimulated below-ground respiration, it exerted only a small influence on the turnover of LMW DOC suggesting that the increase in respiration was due to increased root respiration and not turnover of soil organic matter (SOM). Our results suggest that some components of the LMW DOC pool are turned over extremely rapidly (ca. 4000 times annually).

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  • Under grassland, 20-30 % of DOC was rapidly decomposed by microbial respiration, <5 % was retained in the soil, and the rest was assimilated by the soil microbial biomass.

    “However, under grassland, 20–30 % of DOC was rapidly decomposed by microbial respiration, <5 % was retained in the soil, whilst the rest was assimilated by the soil microbial biomass [156].”

    From Carbon Sequestration by Perennial Energy Crops: Is the Jury Still Out? (2015) · cites this paper as [156]

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Authors
BODDY, E., HILL, P., FARRAR, J., & JONES, D.
Affiliations
Bangor University (GB)
Corresponding author
JONES, D
ORCID
Venue
Soil Biology and Biochemistry
Publisher
Elsevier BV
Published
2007-04
Volume
39
Issue
4
Pages
827-835
ISSN
0038-0717 (ISSN-L)
DOI
10.1016/j.soilbio.2006.09.030
OpenAlex
W2030170935
Cited by
251
References
38
Citations by year
2026: 8 · 2025: 4 · 2024: 9 · 2023: 6 · 2022: 14 · 2021: 9 · 2020: 12 · 2019: 11 · 2018: 15 · 2017: 13 · 2016: 18 · 2015: 11 · 2014: 18 · 2013: 14 · 2012: 25
FWCI
17.27
Type
journal article
Language
en
Open access
closed
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Locations
Soil Biology and Biochemistry (publishedVersion)
Funders
Natural Environment Research Council
Topics
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Mycorrhizal Fungi and Plant Interactions
  • Physical Sciences › Environmental Science › Ecology › Microbial Community Ecology and Physiology
Keywords
carbon turnover, soil pore water, glucose, amino acids, rhizosphere, root exudation, grazing, soil microbial biomass, soil respiration, Eutric Cambisol, temperate grassland, carbon mineralization

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