Passive brigalow (Acacia harpophylla) woodland regeneration fails to recover floristic composition in an agricultural landscape

Article

Le Brocque, Andrew F. and Wagner, Peter M.. 2018. "Passive brigalow (Acacia harpophylla) woodland regeneration fails to recover floristic composition in an agricultural landscape." Austral Ecology: a journal of ecology in the Southern Hemisphere. 43 (4), pp. 409-423. https://doi.org/10.1111/aec.12578
Article Title

Passive brigalow (Acacia harpophylla) woodland regeneration fails to recover floristic composition in an agricultural landscape

ERA Journal ID3204
Article CategoryArticle
AuthorsLe Brocque, Andrew F. (Author) and Wagner, Peter M. (Author)
Journal TitleAustral Ecology: a journal of ecology in the Southern Hemisphere
Journal Citation43 (4), pp. 409-423
Number of Pages15
Year2018
PublisherJohn Wiley & Sons
Place of PublicationAustralia
ISSN1442-9985
1442-9993
Digital Object Identifier (DOI)https://doi.org/10.1111/aec.12578
Web Address (URL)http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1442-9993
Abstract

Regrowth (secondary) vegetation is increasingly seen as an important conservation alternative where there is inadequate cover of intact remnant, and more recently, the focus of potential biodiversity offsets. However, little is known of the functioning and dynamics of regrowth in comparison to remnant vegetation. This research tests whether the floristic composition and stand structure of brigalow (Acacia harpophylla) regrowth woodlands return to that of endangered brigalow remnant woodlands and the relationships of patterns in composition and structure to environmental drivers in the agricultural landscape of southern Queensland, Australia. Thirty-eight sites were sampled for species composition (frequency), stand structure (foliage projected cover of strata) and environmental variables (spatial/patch characteristics), encompassing ungrazed and grazed old-growth brigalow remnants and different aged brigalow regrowth (<20; 20–30; 30–40; >40 years since clearing). There was no difference in structure observed between grazed remnant and older regrowth (>40 years); however, ungrazed old-growth remnants were structurally different to older regrowth. Ungrazed and grazed old-growth remnants were compositionally different to all regrowth woodlands. The proportion of surrounding vegetation, landuse type, patch grazing intensity and soil properties, were highly correlated with patterns in composition and stand structure observed across the brigalow woodlands. While the stand structure of brigalow regrowth returns to that of remnant brigalow, the distinct floristic species composition of older regrowth may indicate a longer time period is needed for equivalence or a possible alternate stable state in these highly modified agricultural landscapes. To ensure the long-term persistence of brigalow communities, further investigation of the development trajectory of brigalow regrowth is required; however, it is critical that intact brigalow remnant vegetation remains a priority for conservation strategy and policy.

Keywordsbrigalow woodland, Acacia harpophylla, regrowth, remnant, floristic composition, stand structure
ANZSRC Field of Research 2020310302. Community ecology (excl. invasive species ecology)
410401. Conservation and biodiversity
410206. Landscape ecology
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Byline AffiliationsSchool of Agricultural, Computational and Environmental Sciences
Institution of OriginUniversity of Southern Queensland
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Kath, Jarrod, Le Brocque, Andrew F. and Miller, Craig. 2009. "Resilience of temporary wetlands in production landscapes and potential impacts of climate change." James, Craig D. (ed.) INTECOL 2010: Ecology in a Changing Climate: Two Hemispheres, One Globe. Brisbane, Australia 16 - 21 Aug 2009 Australia.
Bird assemblages in fragmented agricultural landscapes: the role of small brigalow remnants and adjacent land uses
Collard, Stuart, Le Brocque, Andrew and Zammit, Charlie. 2009. "Bird assemblages in fragmented agricultural landscapes: the role of small brigalow remnants and adjacent land uses." Biodiversity and Conservation. 18 (6), pp. 1649-1670. https://doi.org/10.1007/s10531-008-9548-4
Vegetation changes following the exclusion of grazing in the Traprock region
Le Brocque, Andrew F. and Cockfield, Geoff. 2008. Vegetation changes following the exclusion of grazing in the Traprock region. Toowoomba, Australia. University of Southern Queensland, Australian Centre for Sustainable Catchments / Traprock Wool Association Inc..
Technical report: vegetation changes following the short-term exclusion of grazing in the Traprock region
Goodhew, Kellie A. and Le Brocque, Andrew F.. 2006. Technical report: vegetation changes following the short-term exclusion of grazing in the Traprock region. Toowoomba, Australia. University of Southern Queensland.
Vegetation management, grazing and arthropod assemblages in the Traprock region: interim report
Attwood, Simon J., Le Brocque, Andrew F., Cockfield, Geoff and Schumacher, Roslyn. 2005. Vegetation management, grazing and arthropod assemblages in the Traprock region: interim report. Toowoomba, Australia. University of Southern Queensland.
Technical report: effect of vegetation management on woodland communities in the Traprock region
Le Brocque, Andrew F., Goodhew, Kellie A. and Cockfield, Geoff. 2005. Technical report: effect of vegetation management on woodland communities in the Traprock region. Toowoomba, Australia. University of Southern Queensland.
Endophytic fungi associated with Australian orchids
Dearnaley, John and Le Brocque, Andrew F.. 2006. "Endophytic fungi associated with Australian orchids." Australasian Plant Conservation: Bulletin of the Australian Network for Plant Conservation. 15 (2), pp. 7-9.
Trees in a grazing landscape: vegetation patterns in sheep-grazing agro-ecosystems in Southern Queensland
Le Brocque, Andrew F., Cockfield, Geoff and Goodhew, Kellie A.. 2006. "Trees in a grazing landscape: vegetation patterns in sheep-grazing agro-ecosystems in Southern Queensland." Timmins, Susan (ed.) 3rd Joint Conference of the New Zealand Ecological Society and the Ecological Society of Australia. Wellington, New Zealand 28 Aug - 01 Sep 2006 Wellington, New Zealand.
Vegetation community responses to altered flow regimes and weed invasion in reparian woodlands of the upper condamine floodplain, Eastern Australia
Reardon-Smith, Kathryn, Le Brocque, Andrew F., House, Alan and Zammit, Charlie. 2005. "Vegetation community responses to altered flow regimes and weed invasion in reparian woodlands of the upper condamine floodplain, Eastern Australia." Miller, Craig (ed.) 2005 Conference of the Ecological Society of Australia (ESA 2005). Brisbane, Australia 28 Nov - 02 Dec 2005 Brisbane, Queensland, Australia. Ecological Society of Australia.
Vegetation management and woodland communities in the traprock sheep grazing region of Southern Queensland
Goodhew, Kellie A., Le Brocque, Andrew F. and Zammit, Charlie. 2005. "Vegetation management and woodland communities in the traprock sheep grazing region of Southern Queensland." Miller, Craig (ed.) 2005 Conference of the Ecological Society of Australia (ESA 2005). Brisbane, Australia 28 Nov - 02 Dec 2005 Brisbane, Queensland.
Ecosystem functioning across vegetation - production boundaries in brigalow (Acacia Harpophylla) in Southern Queensland
Collard, Stuart, Zammit, Charlie and Le Brocque, Andrew F.. 2005. "Ecosystem functioning across vegetation - production boundaries in brigalow (Acacia Harpophylla) in Southern Queensland." Miller, Craig (ed.) 2005 Conference of the Ecological Society of Australia (ESA 2005). Brisbane, Australia 28 Nov - 02 Dec 2005 Brisbane, Queensland.