La Trobe
2016 Wang Biol Fert Soil 52, 295.pdf (546.13 kB)

Long-term effect of lime application on the chemical composition of soil organic carbon in acid soils varying in texture and liming history

Download (546.13 kB)
journal contribution
posted on 05.01.2021, 05:44 by Xiaojuan Wang, Caixian Tang, JA Baldock, CR Butterly, C Gazey
© Springer-Verlag Berlin Heidelberg 2015.

There is ample evidence to suggest that liming can regulate soil organic carbon (SOC) pools either directly through influencing the solubility of SOC or indirectly by altering total organic C input as crop residue and SOC loss via change in microbial activity. The aim of this study was to determine the long-term impact of lime application on the quantity and quality of SOC in acid soils. Soils were collected at depths of 0-10, 10-20, 20-30, 30-40, and 40-50 cm from four long-termlime trials with various lime rates (0-25 t ha−1), lime histories (5-35 years), and soil textures (clay content 5- 36 %). Surface application of lime was effective in ameliorating both topsoil and subsoil acidities at sites with low clay content. Liming decreased dissolved organic C (DOC) at 0- 30 cm but increased its aromaticity. Total SOC at 0-10 cm decreased or remained unchanged following long-term liming, depending on the rates of lime application and crop management. Changes in the contents of particulate organic C (POC) and humic organic C (HOC) predicted by midinfrared spectroscopy (MIR) and partial least squares regression (PLSR) showed a similar trend to total SOC at all sites. Lime application had no significant effect on SOC below 10- cm layers and on the MIR-predicted resistant organic C (ROC) fraction. Solid-state13C nuclear magnetic resonance (NMR) spectra indicated that the alkyl C content and alkyl/O-alkyl C ratio were lower in the limed than unlimed plots. Liming possibly had a marked effect on regulating the decomposition and preservation of certain C compounds. The apparent accumulation of alkyl C in the unlimed soil could indicate the potential ability of acid soils to store SOC.

Funding

This research was supported under Australian Research Council's Discovery Projects funding scheme (project DP120104100). We thank Dr. Nick Uren for the establishment of 1979 lime plots at the first site.

History

Publication Date

01/01/2016

Journal

Biology and Fertility of Soils

Volume

52

Issue

3

Pagination

12p. (p. 295-306)

Publisher

Springer Verlag (Germany)

ISSN

0178-2762

Rights Statement

The Author reserves all moral rights over the deposited text and must be credited if any re-use occurs. Documents deposited in OPAL are the Open Access versions of outputs published elsewhere. Changes resulting from the publishing process may therefore not be reflected in this document. The final published version may be obtained via the publisher’s DOI. Please note that additional copyright and access restrictions may apply to the published version.

Licence

Exports