Cited by 1,616Soil Carbon and Nitrogen DynamicsSoil Geostatistics and MappingSoil erosion and sediment transport

Soil organic matter turnover is governed by accessibility not recalcitrance

Dungait, Jennifer A. J., Hopkins, David W., Gregory, Andrew S., Whitmore, Andrew P.·2012·Global Change Biology

Abstract

Mechanisms to mitigate global climate change by sequestering carbon ( C ) in different ‘sinks' have been proposed as at least temporary measures. Of the major global C pools, terrestrial ecosystems hold the potential to capture and store substantially increased volumes of C in soil organic matter ( SOM ) through changes in management that are also of benefit to the multitude of ecosystem services that soils provide. This potential can only be realized by determining the amount of SOM stored in soils now, with subsequent quantification of how this is affected by management strategies intended to increase SOM concentrations, and used in soil C models for the prediction of the roles of soils in future climate change. An apparently obvious method to increase C stocks in soils is to augment the soil C pools with the longest mean residence times ( MRT ). Computer simulation models of soil C dynamics, e.g. RothC and Century, partition these refractory constituents into slow and passive pools with MRT s of centuries to millennia. This partitioning is assumed to reflect: (i) the average biomolecular properties of SOM in the pools with reference to their source in plant litter, (ii) the accessibility of the SOM to decomposer organisms or catalytic enzymes, or (iii) constraints imposed on decomposition by environmental conditions, including soil moisture and temperature. However, contemporary analytical approaches suggest that the chemical composition of these pools is not necessarily predictable because, despite considerable progress with understanding decomposition processes and the role of decomposer organisms, along with refinements in simulation models, little progress has been made in reconciling biochemical properties with the kinetically defined pools. In this review, we will explore how advances in quantitative analytical techniques have redefined the new understanding of SOM dynamics and how this is affecting the development and application of new modelling approaches to soil C .

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Crossref · 10.1111/j.1365-2486.2012.02665.x

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202 of 202 references verified0 citation errors · 0 not checkable

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  • Residues decompose according to a decay rate k dependent on composition, soil protective characteristics, microbial biomass and environmental conditions, which determine the system- and compound-specific mean residence time.

    “Residues decompose according to a decay rate (k), dependent on composition, soil protective characteristics, microbial biomass and environmental conditions (temperature, precipitation, soil texture and water availability), which determine the system and compound specific mean residence time (MRT) [34, 35].”
  • The longevity of aboveground plant parts is defined by abscission, but the decay of aboveground litter depends on its incorporation into the soil and accessibility.

    “The longevity of aboveground plant parts is clearly defined by their abscission, but the decay of aboveground litter depends on its incorporation into the soil [107] and accessibility [34].”
  • Physical protection and chemical adsorption, both controlled by soil texture such as clay content and cation exchange capacity, may play an important role for long-term carbon retention.

    “However, physical protection and chemical adsorption, both controlled by soil texture (e.g. clay content and cation exchange capacity), may play an important role for long-term C retention [4, 34, 35, 101].”

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Authors
Dungait, J. A. J., Hopkins, D. W., Gregory, A. S., & Whitmore, A. P.
Affiliations
Rothamsted Research (GB)
Corresponding author
Dungait, Jennifer A. J.
Venue
Global Change Biology
Publisher
Wiley
Published
2012-03-13
Volume
18
Issue
6
Pages
1781-1796
ISSN
  • 1354-1013 (ISSN-L)
  • 1365-2486
OpenAlex
W2106986958
Cited by
1,616
References
202
Citations by year
2026: 96 · 2025: 124 · 2024: 153 · 2023: 120 · 2022: 180 · 2021: 153 · 2020: 152 · 2019: 122 · 2018: 108 · 2017: 91 · 2016: 97 · 2015: 89 · 2014: 67 · 2013: 48 · 2012: 15
FWCI
106.66
Type
journal article
Language
en
Open access
closed
Locations
  • Global Change Biology (publishedVersion)
  • Rothamsted Repository (Rothamsted Repository) (submittedVersion)
Funders
Biotechnology and Biological Sciences Research Council (BBS/E/C/00005214, BBS/E/C/00004982, BBS/E/C/00005744)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
  • Physical Sciences › Environmental Science › Environmental Engineering › Soil Geostatistics and Mapping
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil erosion and sediment transport
Keywords
soil organic matter turnover, soil carbon sequestration, mean residence time, soil organic matter decomposition, recalcitrant carbon, soil carbon models, RothC, CENTURY model, soil carbon stocks, climate change mitigation

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