Effects of grazing, trenching and surface soil disturbance on ground cover in woody encroachment on the Cobar Pediplain, south-eastern Australia

Title
Effects of grazing, trenching and surface soil disturbance on ground cover in woody encroachment on the Cobar Pediplain, south-eastern Australia
Publication Date
2013
Author(s)
Smith, Rhiannon
( author )
OrcID: https://orcid.org/0000-0002-6375-5684
Email: rsmith66@une.edu.au
UNE Id une-id:rsmith66
Tighe, Matthew
( author )
OrcID: https://orcid.org/0000-0003-1027-0082
Email: mtighe2@une.edu.au
UNE Id une-id:mtighe2
Reid, Nick
( author )
OrcID: https://orcid.org/0000-0002-4377-9734
Email: nrei3@une.edu.au
UNE Id une-id:nrei3
Briggs, Susan
Wilson, Brian
( author )
OrcID: https://orcid.org/0000-0002-7983-0909
Email: bwilson7@une.edu.au
UNE Id une-id:bwilson7
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
Academic Press
Place of publication
United Kingdom
DOI
10.1016/j.jaridenv.2013.04.006
UNE publication id
une:12836
Abstract
This study investigated three possible reasons for low ground cover in an inter-patch in woody encroachment in semi-arid south-eastern Australia: (1) grazing by large herbivores, (2) competition with woody plants for resources, and (3) the smooth, crusted soil surface impeding litter lodgement and germination of seeds. Grazing exclusion, trenching (cutting roots of woody plants to 30 cm depth) and surface soil disturbance treatments were established in October 2008, and herbaceous ground cover and litter cover were measured after three, 16 and 30 months. Perennial grass cover in the ungrazed area was higher in trenched plots than in untrenched plots. Perennial grass cover in the grazed area was very low in trenched and untrenched plots. Herbaceous ground cover increased over time in ungrazed and trenched plots, much more than in grazed or untrenched plots. Soil disturbance did not affect herbaceous ground cover. Herbaceous ground cover was low in all treatments (<10%). Both grazing and cutting roots of woody plants affected herbaceous ground cover in this study. Herbaceous ground cover increased when roots of woody vegetation were severed (in the absence of grazing), indicating that herbaceous ground cover and woody vegetation compete for resources.
Link
Citation
Journal of Arid Environments, v.96, p. 80-86
ISSN
1095-922X
0140-1963
Start page
80
End page
86

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