Basal Area

AUS-ASC-CON-BAS General Moderate confidence

Benchmark Value

No specific value — see range
Range: 33 to 70 m²/ha
Optimal Range: 33 to 70
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 benchmark range of 33−70 m²/ha is considered to represent a highly functional and ecologically desirable state for conservation purposes.

Metric Definition:

Basal area (BA) is a fundamental metric in forest ecology, quantitatively representing the sum of the cross-sectional areas of all tree stems within a given unit of ground area, typically expressed as square metres per hectare (m²/ha).

Justification:

The range is derived from sites representing the best available condition and is therefore indicative of high functionality.

Sources (1)

Preview of www.botanicgardens.org.au, accessed on May 28, 2025
www.botanicgardens.org.au, accessed on May 28, 2025 Journal

Fire frequency and stem structure in snow gum (Eucalyptus pauciflora) woodland in Victoria (Coates, F., Williams, M.R., and Morgan, J.W. (2015). Cunninghamia 15: 15–28)

View Source

Supporting Sources (23)

Additional references from the underlying research that informed this benchmark.

Preview of Ausplots Training - Session 1 | PPT - SlideShare
Ausplots Training - Session 1 | PPT - SlideShare
Methodology Source GreyLiterature

Ausplots Training - Session 1 | PPT - SlideShare

View Source
Preview of Australia's Eucalypt Forests: Environmental Communication - UQ eSpace - The University of Queensland
Australia's Eucalypt Forests: Environmental Communication - UQ eSpace - The University of Queensland
Contextual Support Journal

Native Forests Show Resilience to Selective Timber Harvesting in Southeast Queensland, Australia - Frontiers

View Source
Preview of basal_area: Basal area of tree trunks in TERN AusPlots in ternaustralia/ausplotsR - rdrr.io, accessed July 23, 2025
basal_area: Basal area of tree trunks in TERN AusPlots in ternaustralia/ausplotsR - rdrr.io, accessed July 23, 2025
Contextual Support GreyLiterature

basal_area: Basal area of tree trunks in TERN AusPlots in ternaustralia/ausplotsR - rdrr.io

View Source
Preview of Bioregions and EVC benchmarks - Environment, accessed August 5, 2025,
Bioregions and EVC benchmarks - Environment, accessed August 5, 2025,
Contextual Support Government

TASVEG VCA Manual: A manual for assessing vegetation condition in Tasmania, Version 2.0. Natural and Cultural Heritage, Department of

View Source
Preview of Coastal Integrated Forestry Operations Approval
Coastal Integrated Forestry Operations Approval
Regulatory Framework

Coastal Integrated Forestry Operations Approval

View Source
Preview of Environment Monitoring Systems & Data for Ecosystem Studies ..., accessed July 30, 2025,
Environment Monitoring Systems & Data for Ecosystem Studies ..., accessed July 30, 2025,
Contextual Support Government

(PDF) Evaluation of genetic markers for the metabarcoding of ...

View Source
Preview of Estimation of Alpine Forest Structural Variables from Imaging ... - MDPI
Estimation of Alpine Forest Structural Variables from Imaging ... - MDPI
Contextual Support Journal

Estimation of Alpine Forest Structural Variables from Imaging ... - MDPI

View Source
Preview of Forest Management Plan for the Central Highlands
Forest Management Plan for the Central Highlands
Regulatory Framework Journal

Forest Management Plan for the Central Highlands

View Source
Preview of Forestry Tasmania. (2010). Silvicultural systems for native eucalypt forests. Technical Bulletin No. 5.
Forestry Tasmania. (2010). Silvicultural systems for native eucalypt forests. Technical Bulletin No. 5.
Direct Evidence Journal

Thinning regrowth eucalypts Technical Bulletin

View Source
Preview of Long-unburnt stands of snow gum (Eucalyptus pauciflora Sieber ex Spreng) are exceedingly rare in the Victorian Alps - CSIRO Publishing, accessed on May 28, 2025
Long-unburnt stands of snow gum (Eucalyptus pauciflora Sieber ex Spreng) are exceedingly rare in the Victorian Alps - CSIRO Publishing, accessed on May 28, 2025
Contextual Support Journal

www.publish.csiro.au

View Source
Preview of Long-unburnt stands of snow gum are exceedingly rare
Long-unburnt stands of snow gum are exceedingly rare
Direct Evidence Journal

Long-unburnt stands of snow gum are exceedingly rare

View Source
Preview of Moisture thresholds for combustion of organic soils
Moisture thresholds for combustion of organic soils
Contextual Support Journal

Prior, L. D., et al. (2020). "Soil moisture thresholds for combustion of organic soils in western Tasmania." International Journal of Wildland Fire.

View Source
Preview of Native forest silvicultural systems Fact Sheet
Native forest silvicultural systems Fact Sheet
Contextual Support Journal

Native forest silvicultural systems Fact Sheet

View Source
Preview of NSW Biodiversity Conservation Trust. (2021). Do you want to earn annual payments for conserving rare vegetation in the Southern Tablelands? Snow Gum Woodlands and Grasslands Conservation Tender. Factsheet.
NSW Biodiversity Conservation Trust. (2021). Do you want to earn annual payments for conserving rare vegetation in the Southern Tablelands? Snow Gum Woodlands and Grasslands Conservation Tender. Factsheet.
Direct Evidence GreyLiterature

Long-unburnt stands of snow gum (Eucalyptus pauciflora Sieber ex Spreng) are exceedingly rare in the Victorian Alps: implications for their conservation and management - ResearchGate

View Source
Preview of NSW Legislation G14 Riparian
NSW Legislation G14 Riparian
Regulatory Framework Journal

NSW Legislation G14 Riparian

View Source
Preview of Point intercept data - TERN Australia
Point intercept data - TERN Australia
Contextual Support Journal

TERN. (2020). TERN data for students: a summary of ecosystem monitoring methods, data and activity ideas.

View Source
Preview of Silvicultural systems for native eucalypt forests
Silvicultural systems for native eucalypt forests
Direct Evidence Journal

Silvicultural systems for native eucalypt forests

View Source
Preview of Techniques for measuring stand basal area, accessed August 9, 2025
Techniques for measuring stand basal area, accessed August 9, 2025
Contextual Support Journal

AUSTRALIA'S STATE OF THE FORESTS REPORT - DAFF

View Source
Preview of ternaustralia/ausplotsR: R package to interact with TERN AusPlots data - GitHub, accessed July 15, 2025
ternaustralia/ausplotsR: R package to interact with TERN AusPlots data - GitHub, accessed July 15, 2025
Methodology Source

ausplotsR: quickstart guide to basic analysis of TERN AusPlots vegetation data

View Source
Preview of The impact of climate change and wildfire on decadal alpine vegetation dynamics, accessed on May 25, 2025,
The impact of climate change and wildfire on decadal alpine vegetation dynamics, accessed on May 25, 2025,
Contextual Support Journal

Alpine Ash forests of mainland Australia - Victorian National Parks Association

View Source
Preview of The vegetation structure and condition of contracting lowland habitat for Leadbeater's possum (Gymnobelideus leadbeateri) - CSIRO PUBLISHING | Australian Mammalogy
The vegetation structure and condition of contracting lowland habitat for Leadbeater's possum (Gymnobelideus leadbeateri) - CSIRO PUBLISHING | Australian Mammalogy
Contextual Support Journal

The vegetation structure and condition of contracting lowland habitat for Leadbeater's possum (Gymnobelideus leadbeateri) - CSIRO PUBLISHING | Australian Mammalogy

View Source
Preview of Thinning Regrowth Eucalypts - Sustainable Timber Tasmania
Thinning Regrowth Eucalypts - Sustainable Timber Tasmania
Direct Evidence Journal

Mapping distribution and canopy condition of subalpine woodlands

View Source
Preview of www.environment.nsw.gov.au, accessed on May 25, 2025,
www.environment.nsw.gov.au, accessed on May 25, 2025,
Contextual Support

The Australian Alps Bioregion - Environment and Heritage, accessed on May 27, 2025,

View Source

Context

  • Region Australia
  • Biome Alpine and Subalpine Complex
  • Land Use Conservation / Protected Natural Areas
  • Assessment Conservation Target
  • Evidence Type ReferenceCondition

Lifecycle

  • Status Active
  • Version 2
  • Effective From 2 Jun 2026

Notes

No explicitly defined "optimal" BA range was found, but this range is considered highly functional.

Related Benchmarks

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

— m²/ha Moderate
Conservation / Protected Natural Areas · Conservation Target
OptimalRange Superseded v1
75 m²/ha Moderate
Conservation / Protected Natural Areas · Conservation Target
UpperThreshold Rejected v1