Biogeochemistry

, Volume 124, Issue 1, pp 205–217

Subtropical giant podzol chronosequence reveals that soil carbon stabilisation is not governed by litter quality

  • Andrew R. Jones
  • Jonathan Sanderman
  • Diane Allen
  • Ram Dalal
  • Susanne Schmidt
Article

DOI: 10.1007/s10533-015-0093-4

Cite this article as:
Jones, A.R., Sanderman, J., Allen, D. et al. Biogeochemistry (2015) 124: 205. doi:10.1007/s10533-015-0093-4

Abstract

The magnitude of the carbon flux between soil and atmosphere has prompted efforts to better understand the controls over the fate of carbon in plant litter that re-enters the atmosphere as carbon dioxide or is sequestered as soil organic carbon (SOC). It remains unresolved if the long-term fate of litter carbon is driven by biochemical properties of litter or by soil properties that reduce the ability of soil organisms to decompose litter-derived carbon. The prominent role that reactive soil minerals play in stabilising SOC have hindered investigation into the single role of litter quality on long-term SOC stability. Here we investigated the independent effects of litter quality on soil carbon stabilisation across a 460,000 year sand dune chronosequence characterised by a pronounced nutrient and litter quality gradient with minimum presence of interfering soil minerals. Using a steady state turnover model to interpret radiocarbon activity in soils collected ≈40 years apart, we show that the turnover time of SOC in the A horizon averaged 22 years (ranging from 16 to 27 years) across the chronosequence. This finding strongly contrasts other chronosequences where SOC turnover rates range from 60 to 726 years in concert with changing abundance and composition of soil minerals. Our study demonstrates that the long-term stability of SOC in surface horizons may be largely determined by interaction with soil minerals and that litter quality per se does not govern carbon stabilisation.

Keywords

Soil carbonTurnoverLitter qualityChronosequenceSoil nutrientsRadiocarbon

Supplementary material

10533_2015_93_MOESM1_ESM.docx (20 kb)
Supplementary material 1 (DOCX 21 kb)
10533_2015_93_MOESM2_ESM.tif (291 kb)
Supplementary material 2 (TIF 292 kb)

Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Andrew R. Jones
    • 1
    • 2
  • Jonathan Sanderman
    • 3
  • Diane Allen
    • 1
    • 2
  • Ram Dalal
    • 1
    • 2
  • Susanne Schmidt
    • 1
  1. 1.School of Agriculture and Food SciencesThe University of QueenslandSt LuciaAustralia
  2. 2.Department of Science, Information Technology and InnovationBrisbaneAustralia
  3. 3.CSIRO Agriculture Flagship, Waite CampusUrrbraeAustralia