Cited by 372Soil Carbon and Nitrogen DynamicsSoil erosion and sediment transportSoil Management and Crop Yield

Soil Carbon Saturation Controls Labile and Stable Carbon Pool Dynamics

Gulde, S., Chung, H., Amelung, W., Chang, C., Six, J.·2008·Soil Science Society of America Journal

Abstract

Recently, it has been suggested that soil organic C (SOC) does not always respond linearly to increasing C input, thereby limiting the rate and efficiency of C stabilization in soils. Therefore, we postulated that when a soil is exposed to a broad range of C inputs through a range of manure treatments, it will show C saturation behavior and different SOC pools will saturate at different rates. To test this, different SOC pools were isolated by physical fractionation techniques from a long‐term agricultural experiment in Lethbridge, Canada. In this experiment, manure has been applied since 1973 at rates of 0, 60, 120, and 180 Mg ha −1 yr −1 (wet weight). In the total mineral soil as well as the small macroaggregates (250–2000 μm), microaggregates (53–250 μm), and the silt plus clay fraction (<53 μm), an increase was observed in SOC contents with an increase in manure application rate to 120 Mg ha −1 yr −1 However, no additional C was sequestered when the manure application rate was augmented to 180 Mg ha −1 yr −1 , indicating C saturation in these SOC pools. Large macroaggregates (>2000 μm) were the only water‐stable aggregate fraction that increased in C content across all manure input levels. Further physical separation of macroaggregates into subpools by microaggregate isolation showed that coarse (>250 μm) particulate organic matter (POM) was the fraction that accounted most for the increase in C content of the large macroaggregates. Furthermore, the turnover of large macroaggregates increased with increasing manure applications, as indicated by decreased formation and stabilization of intramicroaggregate POM within the large macroaggregates. We conclude that as C input increases, the mineral fraction of a soil saturates and consequently additional C input will only accumulate in labile soil C pools that have a relatively faster turnover.

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Crossref · 10.2136/sssaj2007.0251

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  • The POM fraction is predominantly plant-derived C and its increase is driven by the increment in quantity and quality of plant C inputs to the soil and management practices such as tillage cessation.

    “The POM fraction is predominantly plant-derived C and its increase is driven by the increment in quantity and quality of plant C inputs to the soil (Gulde et al., 2008;Cotrufo et al., 2013) and management practices (i.e., tillage cessation) (Six et al., 2000).”

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Authors
Gulde, S., Chung, H., Amelung, W., Chang, C., & Six, J.
Affiliations
  • University of Bonn (DE)
  • University of California, Davis (US)
  • Agriculture and Agri-Food Canada (CA)
Corresponding author
Six, J.
Venue
Soil Science Society of America Journal
Publisher
Wiley
Published
2008-05
Volume
72
Issue
3
Pages
605-612
ISSN
  • 0361-5995 (ISSN-L)
  • 1435-0661
OpenAlex
W2053756232
Cited by
372
References
36
Citations by year
2026: 14 · 2025: 24 · 2024: 18 · 2023: 24 · 2022: 23 · 2021: 38 · 2020: 25 · 2019: 14 · 2018: 23 · 2017: 15 · 2016: 22 · 2015: 17 · 2014: 22 · 2013: 21 · 2012: 19
FWCI
26.94
Type
journal article
Language
en
Open access
closed
Locations
Soil Science Society of America Journal (publishedVersion)
Funders
U.S. Department of Energy (DE‐FG02‐04ER63912)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil erosion and sediment transport
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Management and Crop Yield
Keywords
soil organic carbon, carbon saturation, manure application rate, labile carbon pools, soil carbon sequestration, particulate organic matter, microaggregates, macroaggregates, water-stable aggregates, carbon stabilization, long-term agricultural experiments

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