Basal Area

AUS-TSW-CON-BAS General Moderate confidence

Benchmark Value

No specific value — see range
Range: 5 to 8.5 m²/ha
Optimal Range: 5 to 8.5
Direction: Higher is desirable ↑
Form: OptimalRange

Scoring Curve

This curve shows how a field measurement for this indicator would score across all available benchmark forms in this context. The scoring engine uses 17 benchmarks together — the OptimalRange form drives the primary score, while 16 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MinimumOnly Guard OptimalRange Guard OptimalRange Guard MinimumOnly Guard MaximumOnly Guard Point Guard LowerThreshold Guard OptimalRange Guard UpperThreshold Guard OptimalRange Guard OptimalRange Guard MinimumOnly Guard Point Guard OptimalRange Guard MinimumOnly Guard MaximumOnly Guard

Evidence & Context

The reference value of 5.0–8.5 m²/ha is derived from empirical measurements in long-unburnt, old-growth eucalypt woodlands within the Great Western Woodlands (GWW) and other high-integrity remnants, representing the best-on-offer structurally complex and ecologically functional condition for this biome.

Metric Definition:

Basal area (BA) is the total cross-sectional area of tree stems at breast height (1.3 m) per unit of land, expressed in square meters per hectare (m²/ha).

Benchmark Definition:

This benchmark represents the optimal basal area range for mature, structurally complex eucalypt woodlands in temperate semi-arid shrublands and open woodlands under conservation management in Australia.

Justification:

This range is selected because it directly encapsulates values observed in the most relevant and credible reference ecosystems, representing a mature woodland structure that balances ecological benefits with water availability constraints.

Sources (1)

Preview of A conceptual model of vegetation dynamics for the unique obligate-seeder eucalypt woodlands of south-western Australia
A conceptual model of vegetation dynamics for the unique obligate-seeder eucalypt woodlands of south-western Australia Journal

A conceptual model of vegetation dynamics for the unique obligate-seeder eucalypt woodlands of south-western Australia

View Source

Supporting Sources (31)

Additional references from the underlying research that informed this benchmark.

Preview of A REEVALUATION OF THE -3/, POWER RULE OF PLANT SELF-THINNING', accessed July 15, 2025,
A REEVALUATION OF THE -3/, POWER RULE OF PLANT SELF-THINNING', accessed July 15, 2025,
Contextual Support Journal

A REEVALUATION OF THE -3/, POWER RULE OF PLANT SELF-THINNING', accessed July 15, 2025,

View Source
Preview of An inventory and condition survey of the Western Australian part of ...
An inventory and condition survey of the Western Australian part of ...
Contextual Support Journal

An inventory and condition survey of the Western Australian part of ...

View Source
Preview of Coolgardie woodlands - Wikipedia, accessed July 13, 2025
Coolgardie woodlands - Wikipedia, accessed July 13, 2025
Contextual Support GreyLiterature

Salinity - Murray�Darling Basin Authority

View Source
Preview of CSIRO Research Publications Repository - Home Page, accessed July 15, 2025,
CSIRO Research Publications Repository - Home Page, accessed July 15, 2025,
Contextual Support GreyLiterature

A conceptual model of vegetation dynamics for the unique obligate-seeder eucalypt woodlands of south-western Australia | Request PDF - ResearchGate, accessed July 15, 2025,

View Source
Preview of East Australian Mediterranean Woodlands & Temperate Savannas ..., accessed July 15, 2025
East Australian Mediterranean Woodlands & Temperate Savannas ..., accessed July 15, 2025
Contextual Support

Plants of the mallee shrublands - Australian National Botanic Gardens, accessed July 13, 2025

View Source
Preview of East Australian Mediterranean Woodlands & Temperate Savannas (AU4) - One Earth, accessed July 15, 2025,
East Australian Mediterranean Woodlands & Temperate Savannas (AU4) - One Earth, accessed July 15, 2025,
Contextual Support Journal

East Australian Mediterranean Woodlands & Temperate Savannas (AU4) - One Earth, accessed July 15, 2025,

View Source
Preview of Forest - Wikipedia, accessed July 15, 2025,
Forest - Wikipedia, accessed July 15, 2025,
Contextual Support GreyLiterature

Differential tree mortality in response to severe drought: evidence for long-term vegetation shifts - Northern Arizona University, accessed July 15, 2025,

View Source
Preview of Forest and woodland stand structural complexity: Its definition and measurement, accessed July 12, 2025,
Forest and woodland stand structural complexity: Its definition and measurement, accessed July 12, 2025,
Contextual Support Journal

Estimating stand basal area

View Source
Preview of Forest and woodland stand structural complexity: Its definition and measurement, accessed July 15, 2025,
Forest and woodland stand structural complexity: Its definition and measurement, accessed July 15, 2025,
Contextual Support Government

Forest and woodland stand structural complexity: Its definition and measurement, accessed July 15, 2025,

View Source
Preview of Gibbons, P., et al. (2010). Benchmark stem densities for forests and woodlands in south-eastern Australia under conditions of relatively little modification by humans since European settlement. Forest Ecology and Management, 260(12), 2125-2133.
Gibbons, P., et al. (2010). Benchmark stem densities for forests and woodlands in south-eastern Australia under conditions of relatively little modification by humans since European settlement. Forest Ecology and Management, 260(12), 2125-2133.
Contextual Support GreyLiterature

(PDF) Scientific Assessment of Vegetation Condition Protocols - ResearchGate

View Source
Preview of Great Western Woodlands Project - DBCA Library, accessed July 15, 2025,
Great Western Woodlands Project - DBCA Library, accessed July 15, 2025,
Contextual Support Journal

Great Western Woodlands Project - DBCA Library, accessed July 15, 2025,

View Source
Preview of Great Western Woodlands SuperSite | Climate Change Impacts - TERN Australia, accessed July 10, 2025,
Great Western Woodlands SuperSite | Climate Change Impacts - TERN Australia, accessed July 10, 2025,
Contextual Support Government

URBAN FOREST STRATEGY - Your Say South Perth, accessed July 13, 2025

View Source
Preview of Green Carbon - Gondwana Link, accessed July 15, 2025,
Green Carbon - Gondwana Link, accessed July 15, 2025,
Contextual Support Journal

Green Carbon - Gondwana Link, accessed July 15, 2025,

View Source
Preview of Impact of a prolonged decline in rainfall on eucalypt woodlands in southwestern Australia and its consequences for avifauna - CSIRO Publishing, accessed August 12, 2025,
Impact of a prolonged decline in rainfall on eucalypt woodlands in southwestern Australia and its consequences for avifauna - CSIRO Publishing, accessed August 12, 2025,
Contextual Support

Impact of a prolonged decline in rainfall on eucalypt woodlands in southwestern Australia and its consequences for avifauna - CSIRO Publishing

View Source
Preview of Long-term monitoring and modelling of pasture regeneration and water quality from a Bothriochloa pertusa site in the Great Barrier Reef catchments - CSIRO PUBLISHING | The Rangeland Journal, accessed July 15, 2025,
Long-term monitoring and modelling of pasture regeneration and water quality from a Bothriochloa pertusa site in the Great Barrier Reef catchments - CSIRO PUBLISHING | The Rangeland Journal, accessed July 15, 2025,
Contextual Support Journal

Reducing the impacts of grazing on water quality - EPA Victoria, accessed July 10, 2025,

View Source
Preview of Long-term monitoring and modelling of pasture regeneration and water quality from a Bothriochloa pertusa site in the Great Barrier Reef catchments - CSIRO PUBLISHING | The Rangeland Journal, accessed July 15, 2025,
Long-term monitoring and modelling of pasture regeneration and water quality from a Bothriochloa pertusa site in the Great Barrier Reef catchments - CSIRO PUBLISHING | The Rangeland Journal, accessed July 15, 2025,
Contextual Support

Eucalypt regeneration on the Lower Murray floodplain, South Australia - Adelaide Research & Scholarship, accessed July 15, 2025,

View Source
Preview of Mallee bioregion - Wikipedia
Mallee bioregion - Wikipedia
Contextual Support GreyLiterature

FARM DAMS – A GUIDE TO SITING, DESIGN, CONSTRUCTION AND MANAGEMENT ON EYRE PENINSULA - Sheep Connect SA

View Source
Preview of management of inland arid and semi-arid woodland ... - DBCA Library, accessed July 12, 2025,
management of inland arid and semi-arid woodland ... - DBCA Library, accessed July 12, 2025,
Contextual Support Journal

management of inland arid and semi-arid woodland ... - DBCA Library

View Source
Preview of mundooisland.com.au, accessed July 15, 2025,
mundooisland.com.au, accessed July 15, 2025,
Contextual Support Journal

mundooisland.com.au, accessed July 15, 2025,

View Source
Preview of Not All Kinds of Revegetation Are Created Equal: Revegetation Type Influences Bird Assemblages in Threatened Australian Woodland Ecosystems - PubMed Central, accessed July 15, 2025,
Not All Kinds of Revegetation Are Created Equal: Revegetation Type Influences Bird Assemblages in Threatened Australian Woodland Ecosystems - PubMed Central, accessed July 15, 2025,
Contextual Support Journal

Not All Kinds of Revegetation Are Created Equal: Revegetation Type Influences Bird Assemblages in Threatened Australian Woodland Ecosystems - PubMed Central, accessed July 15, 2025,

View Source
Preview of NVIS Fact sheet MVG 14 – Mallee woodlands and shrublands - DCCEEW, accessed July 15, 2025
NVIS Fact sheet MVG 14 – Mallee woodlands and shrublands - DCCEEW, accessed July 15, 2025
Contextual Support Journal

NVIS Fact sheet MVG 14 – Mallee woodlands and shrublands - DCCEEW, accessed August 28, 2025

View Source
Preview of Picture goes here (in Header and Footer) Ecological impacts of firewood collection, accessed July 12, 2025,
Picture goes here (in Header and Footer) Ecological impacts of firewood collection, accessed July 12, 2025,
Contextual Support Journal

Does thinning regrowth restore habitat for biodiversity? - NSW Department of Primary Industries, accessed July 15, 2025,

View Source
Preview of Recruitment, mortality and growth in semi‐arid conifer‐eucalypt forest: Small trees insure against fire and drought - PubMed Central, accessed July 12, 2025,
Recruitment, mortality and growth in semi‐arid conifer‐eucalypt forest: Small trees insure against fire and drought - PubMed Central, accessed July 12, 2025,
Contextual Support Journal

Recruitment, mortality and growth in semi‐arid conifer‐eucalypt forest: Small trees insure against fire and drought - PMC, accessed April 1, 2026,

View Source
Preview of Recruitment, mortality and growth in semi‐arid conifer‐eucalypt forest: Small trees insure against fire and drought - PubMed Central, accessed July 15, 2025,
Recruitment, mortality and growth in semi‐arid conifer‐eucalypt forest: Small trees insure against fire and drought - PubMed Central, accessed July 15, 2025,
Contextual Support Journal

Recruitment, mortality and growth in semi‐arid conifer‐eucalypt forest: Small trees insure against fire and drought - PubMed Central, accessed July 15, 2025,

View Source
Preview of Soil moisture response to seasonal drought conditions and post‐thinning forest structure, accessed July 15, 2025,
Soil moisture response to seasonal drought conditions and post‐thinning forest structure, accessed July 15, 2025,
Contextual Support Journal

www.nrc.nsw.gov.au, accessed May 15, 2025,

View Source
Preview of Southeast Australia Temperate Forests | One Earth, accessed July 15, 2025,
Southeast Australia Temperate Forests | One Earth, accessed July 15, 2025,
Contextual Support Journal

Southeast Australia Temperate Forests | One Earth, accessed July 15, 2025,

View Source
Preview of The distribution of extant (dark shading) mallee vegetation in the... | Download Scientific Diagram - ResearchGate, accessed July 15, 2025,
The distribution of extant (dark shading) mallee vegetation in the... | Download Scientific Diagram - ResearchGate, accessed July 15, 2025,
Contextual Support Journal

The distribution of extant (dark shading) mallee vegetation in the... | Download Scientific Diagram - ResearchGate, accessed July 15, 2025,

View Source
Preview of Transpiration of Eucalyptus woodlands across a natural gradient of depth-to-groundwater, accessed July 15, 2025,
Transpiration of Eucalyptus woodlands across a natural gradient of depth-to-groundwater, accessed July 15, 2025,
Contextual Support Journal

Soil moisture response to seasonal drought conditions and post‐thinning forest structure - Southwest Watershed Research Center: Tucson, AZ, accessed July 15, 2025,

View Source
Preview of Using basal area to estimate aboveground carbon stocks in forests: La Primavera Biosphere's Reserve, Mexico | Forestry - Oxford Academic, accessed July 20, 2025,
Using basal area to estimate aboveground carbon stocks in forests: La Primavera Biosphere's Reserve, Mexico | Forestry - Oxford Academic, accessed July 20, 2025,
Contextual Support Journal

Vegetation and floristics of a lowland tropical rainforest in northeast Australia, accessed July 20, 2025

View Source
Preview of Woodlands - DCCEEW, accessed August 5, 2025,
Woodlands - DCCEEW, accessed August 5, 2025,
Contextual Support Government

Woodlands - DCCEEW, accessed August 4, 2025,

View Source
Preview of Woodlands and woody debris: Understanding structure and composition to inform restoration - PubMed, accessed July 12, 2025,
Woodlands and woody debris: Understanding structure and composition to inform restoration - PubMed, accessed July 12, 2025,
Contextual Support Journal

A report on silvicultural guidelines for the 2024- 2033 Forest Management Plan to the Western Australian Department of Biodiversity, Conservation and, accessed July 12, 2025

View Source

Context

  • Region Australia
  • Biome Temperate Semi-Arid Shrublands & Open Woodlands
  • Land Use Conservation / Protected Natural Areas
  • Assessment Conservation Target
  • Vegetation Woodland
  • Evidence Type ReferenceCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 7 Jun 2026

Notes

The optimal range avoids both overly sparse and overly dense conditions, balancing structural complexity and ecological function in water-limited environments.

Related Benchmarks

Other benchmarks in the AUS-TSW-CON-BAS family.

2 m²/ha Moderate
Conservation / Protected Natural Areas · Conservation Target · Woodland
MinimumOnly Active v1