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Biology and Fertility of Soils

, Volume 53, Issue 4, pp 431–443 | Cite as

The short-term effects of liming on organic carbon mineralisation in two acidic soils as affected by different rates and application depths of lime

  • S. P. Grover
  • C. R. Butterly
  • X. Wang
  • C. Tang
Original Paper

Abstract

Two acidic soils (initial pH, 4.6) with contrasting soil organic C (SOC) contents (11.5 and 40 g C kg−1) were incubated with 13C-labelled lime (Ca13CO3) at four different rates (nil, target pH 5, 5.8 and 6.5) and three application depths (0–10, 20–30 and 0–30 cm). We hypothesised that liming would stimulate SOC mineralisation by removing pH constraints on soil microbes and that the increase in mineralisation in limed soil would be greatest in the high-C soil and lowest when the lime was applied in the subsoil. While greater SOC mineralisation was observed during the first 3 days, likely due to lime-induced increases in SOC solubility, this effect was transient. In contrast, SOC mineralisation was lower in limed than in non-limed soils over the 87-day study, although only significant in the Tenosol (70 μg C g−1 soil, 9.15%). We propose that the decrease in SOC mineralisation following liming in the low-C soil was due to increased microbial C-use efficiency, as soil microbial communities used less energy maintaining intracellular pH or community composition changed. A greater reduction in SOC mineralisation in the Tenosol for low rates of lime (0.3 and 0.5 g column−1) or when the high lime rate (0.8 g column−1) was mixed through the entire soil column without changes in microbial biomass C (MBC) could indicate a more pronounced stabilising effect of Ca2+ in the Tenosol than the Chromosol with higher clay content and pH buffer capacity. Our study suggests that liming to ameliorate soil acidity constraints on crop productivity may also help to reduce soil C mineralisation in some soils.

Keywords

Soil pH Soil carbon Carbon decomposition Priming effect Soil organic matter 

Notes

Acknowledgements

This research was supported by the Australian Government Department of Agriculture and Water as part of its Carbon Farming Futures Filling the Research Gap II Program. We are grateful to the Department of Agriculture and Food, WA and Agriculture Victoria, for access to field soils and to Kaien Ra and Leanne Lisle for their assistance in laboratory analyses.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • S. P. Grover
    • 1
  • C. R. Butterly
    • 1
  • X. Wang
    • 1
  • C. Tang
    • 1
  1. 1.Centre for AgriBioscience, Department of Animal, Plant and Soil SciencesLa Trobe UniversityMelbourneAustralia

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