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Journal of the Australian Rangeland Society
RESEARCH ARTICLE

High soil acidity under native shrub encroachment in the Cobar Pediplain, south-eastern Australia

M. Tighe A C , N. Reid A , B. R. Wilson A and M. T. McHenry B
+ Author Affiliations
- Author Affiliations

A School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia.

B School of Land and Food, University of Tasmania, Hobart, Tas. 7005, Australia.

C Corresponding author. Email: mtighe2@une.edu.au

The Rangeland Journal 40(5) 451-462 https://doi.org/10.1071/RJ17124
Submitted: 4 December 2017  Accepted: 27 August 2018   Published: 4 October 2018

Abstract

This study investigated the chemical characteristics of shallow (0–30 cm) soil profiles under shrubs in areas of dense encroachment and compared them with shallow soil profiles under nearby large trees. Consistent patterns of high soil acidity were found under shrubs, as well as lower litter alkalinity, lower relative concentrations of calcium (Ca2+), lower effective cation exchange capacity, and higher aluminium (Al3+) and sodium (Na+) in the soil profile compared with under trees. Soil pH (CaCl2) was strongly correlated with the Ca content of surface litter. These findings suggest that shrubs (which at most sites included the shrub form of tree species) cycle alkalinity differently from large and mature trees, resulting in high acidity in the shallow soil profile acidity, and possible loss of alkalinity via surface movement of material from areas of dense encroachment.

Additional keywords: landscape ecology, leaf litter, root–soil interactions, semi-arid shrublands.


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