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Impact of tree clearing on soil attributes for a pastoral property in Central Queensland, Australia

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journal contribution
posted on 06.12.2017, 00:00 authored by Kamaljit SanghaKamaljit Sangha, Rajesh JalotaRajesh Jalota, David MidmoreDavid Midmore
Impacts of tree clearing on soil properties in grazing systems of Queensland largely remain undetermined. In the past, most of the land was cleared to develop pastures to enhance pasture production. The present research highlights how tree clearing affects soil attributes over time on a pastoral property in the semiarid zone of Central Queensland, Australia. Paired cleared and uncleared pasture systems were selected to represent three different times since clearing (5, 11–13, and 33 years). Three woodland plant communities, which are common in the region, were studied: poplar box (Eucalyptus populnea), ironbark (Eucalyptus melanophloia), and brigalow (Acacia harpophyllla). Soil macronutrients and micronutrients and exchangeable cations were studied down the profile for 0–5, 5–10, 10–20, 20–30, and 30–60 cm depth. The results suggest that tree clearing initially increased concentration of some nutrients (such as total N in the topsoil) that consequently augmented pasture production. However, this scenario changes with increased time since clearing: concentrations of some soil nutrients increased, whereas some decreased, thus disturbing the equilibrium in soil functions that further impacts upon pasture yield. The impacts of clearing on soil properties were more apparent at deeper layers of soils. Increase in concentrations of Na at 30–60 cm in cleared pastures of E. populnea and E. melanophloia raises concern for sodicity. Results from this study support other findings in the region that changing native woodlands to introduced grass pastures is likely to have consequences on soil nutrients, which can affect cattle production gains and the sustainability of pasture systems.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

172

Issue

7

Start Page

516

End Page

533

Number of Pages

18

ISSN

0038-075X

Location

USA

Publisher

Lippincott Williams & Wilkins Inc

Language

en-aus

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Centre for Plant and Water Science; Faculty of Sciences, Engineering and Health;

Era Eligible

Yes

Journal

Soil Science.