Basal Area — Benchmark Detail

Benchmark Value

9 m²/ha

Direction: Higher is desirable ↑

Form: MinimumOnly

Scoring Curve

This curve shows how a field measurement for this indicator would score across all available benchmark forms in this context.

Evidence & Context

The Tasmanian silvicultural guidelines explicitly state that for E. delegatensis shelterwood systems, retained basal areas below 12 m²/ha (and particularly below 9 m²/ha in lower rainfall areas) can lead to reduced seedling recruitment.

Metric Definition:

Retained basal area post-harvest below which regeneration success is significantly compromised in Eucalyptus delegatensis shelterwood systems.

Benchmark Definition:

Critical lower basal area threshold for regeneration success in production forestry.

Justification:

Basal areas below 9 m²/ha significantly compromise regeneration due to insufficient seed source and site amelioration.

Sources (2)

NSW Private Native Forestry Code of Practice for Southern NSW

NSW Private Native Forestry Code of Practice for Southern NSW

View Source

Sustainable Timber Tasmania Technical Bulletin 2: Eucalyptus delegatensis Forests Journal

Sustainable Timber Tasmania Technical Bulletin 2: Eucalyptus delegatensis Forests

View Source

Supporting Sources (25)

Additional references from the underlying research that informed this benchmark.

(PDF) Modelling individual tree maximum basal area growth rates of ...

Contextual Support Journal

(PDF) Modelling individual tree maximum basal area growth rates of ...

View Source

Preview of Buckley, T. N., Turnbull, T. L., Pfautsch, S., Gharun, M., & Adams, M. A. (2012). Differences in water use between mature and regrowth Alpine Ash (Eucalyptus delegatensis R. Baker) in high elevation catchments.

Buckley, T. N., Turnbull, T. L., Pfautsch, S., Gharun, M., & Adams, M. A. (2012). Differences in water use between mature and regrowth Alpine Ash (Eucalyptus delegatensis R. Baker) in high elevation catchments.

Direct Evidence Journal

View Source

Continuous Cover Forestry in practice - ASKAFOR, accessed March 28, 2026,

Contextual Support Journal

Continuous Cover Forestry in practice - ASKAFOR

View Source

EARLY GROWTH OF EUCALYPTUS DELEGATENSIS PROVENANCES IN FOUR FIELD TRIALS IN SOUTH-EASTERN AUSTRALIA, accessed March 28, 2026,

Contextual Support Government

EARLY GROWTH OF EUCALYPTUS DELEGATENSIS PROVENANCES IN FOUR FIELD TRIALS IN SOUTH-EASTERN AUSTRALIA

View Source

Forest Ecology and Management - Northwest Fire Science Consortium, accessed March 28, 2026,

Contextual Support Journal

Forest Ecology and Management - Northwest Fire Science Consortium

View Source

Forest Practices Authority (FPA) Tasmania. (2021). Technical Bulletin 2: Eucalyptus delegatensis forests.

Direct Evidence Journal

Forest Practices Authority (FPA) Tasmania. (2021). Technical Bulletin 2: Eucalyptus delegatensis forests.

View Source

Forestry Industry Action Plan, accessed March 28, 2026,

Contextual Support Journal

Impact of intense disturbance on the structure and composition of wet-eucalypt forests: A case study from the Tasmanian 2016 wildfires | PLOS One, accessed April 6, 2026

View Source

Preview of Full article: Active management: a definition and considerations for implementation in forests of temperate Australia - Taylor & Francis, accessed March 28, 2026,

Full article: Active management: a definition and considerations for implementation in forests of temperate Australia - Taylor & Francis, accessed March 28, 2026,

Contextual Support

Full article: Active management: a definition and considerations for implementation in forests of temperate Australia - Taylor & Francis

View Source

guidelines for sustainable forestry on private lands in nsw - ResearchGate, accessed August 1, 2025,

Contextual Support

guidelines for sustainable forestry on private lands ... - ResearchGate, accessed July 30, 2025

View Source

INTRODUCTION - DBCA Library, accessed March 28, 2026,

Contextual Support Journal

INTRODUCTION - DBCA Library

View Source

Long-Term Empirical Studies Highlight Multiple Drivers of Temporal Change in Bird Fauna in the Wet Forests of Victoria

Contextual Support Journal

Zhou, X., et al. (2025). Forest cover and canopy health mapping in Australian subalpine landscape: supervised machine learning models for Sentinel-2 and Landsat images.

View Source

Macroecology of Australian Tall Eucalypt Forests: Baseline Data from a Continental-Scale Permanent Plot Network - PMC

Direct Evidence Journal

Macroecology of Australian Tall Eucalypt Forests: Baseline Data from a Continental-Scale Permanent Plot Network - PMC

View Source

Macroecology of Australian Tall Eucalypt Forests: Baseline Data from a Continental-Scale Permanent Plot Network - PMC, accessed March 28, 2026,

Contextual Support Journal

Unraveling Elevation-Driven Variations in Forest Structure and Composition in Western Nepal - MDPI

View Source

Preview of Modelling individual tree maximum basal area growth rates of five tall eucalypt species growing in even-aged forests - ResearchGate, accessed March 28, 2026,

Modelling individual tree maximum basal area growth rates of five tall eucalypt species growing in even-aged forests - ResearchGate, accessed March 28, 2026,

Contextual Support Journal

Tasmania's giant eucalypts: discovery, documentation, macroecology and conservation status of the world's largest - Amazon S3

View Source

Preview of NSW Environment Protection Authority. (n.d.). Techniques for Measuring Stand Basal Area. Private Native Forestry Code of Practice Guideline No. 5.

NSW Environment Protection Authority. (n.d.). Techniques for Measuring Stand Basal Area. Private Native Forestry Code of Practice Guideline No. 5.

Contextual Support Journal

Techniques for Measuring Stand Basal Area - NSW Environment Protection Authority

View Source

Private Forests Tasmania. (2023). Native forest silvicultural systems: Fact Sheet 3.

Direct Evidence Journal

Private Forests Tasmania. (2023). Native forest silvicultural systems: Fact Sheet 3.

View Source

Private Native Forestry Code of Practice for Southern NSW - FAOLEX, accessed May 15, 2025

Contextual Support Regulatory Framework Journal

Forestry Corporation of NSW (2022). Private Native Forestry Code of Practice for Southern New South Wales.

View Source

Private Native Forestry Code of Practice for Southern NSW - Local Land Services, accessed May 26, 2025

Contextual Support Journal

NSW Private Native Forestry Code of Practice for Southern NSW

View Source

Preview of Research program - Koala response to harvesting in NSW north coast state forests Final report (updated) December 2022 - Natural Resources Commission, accessed March 28, 2026,

Research program - Koala response to harvesting in NSW north coast state forests Final report (updated) December 2022 - Natural Resources Commission, accessed March 28, 2026,

Contextual Support Journal

Research program - Koala response to harvesting in NSW north coast state forests Final report (updated) December 2022 - Natural Resources Commission

View Source

Preview of Schedule-1-Management-Standards-and-Procedures-for-timber-harvesting-operations-in-Victorias-State-forests.pdf, accessed March 28, 2026,

Schedule-1-Management-Standards-and-Procedures-for-timber-harvesting-operations-in-Victorias-State-forests.pdf, accessed March 28, 2026,

Contextual Support Journal

Wahren, C. H., Papst, W. A., & Williams, R. J. (1999). Long-term vegetation change in the Bogong High Plains, Victoria.

View Source

Silvicultural monitoring in uneven-aged highland dry Eucalyptus delegatensis forests in Tasmania, accessed March 28, 2026,

Contextual Support Journal

Silvicultural monitoring in uneven-aged highland dry Eucalyptus delegatensis forests in Tasmania

View Source

Technical Bulletin 2: Eucalyptus delegatensis forests

Regulatory Framework Journal

New South Wales Government. (2022). Private Native Forestry Code of Practice for Southern NSW.

View Source

Thinning Regrowth Eucalypts - Sustainable Timber Tasmania

Direct Evidence Journal

Mapping distribution and canopy condition of subalpine woodlands

View Source

Thinning Regrowth Eucalypts - Sustainable Timber Tasmania, accessed March 28, 2026,

Methodology Source GreyLiterature

Silvicultural systems for native eucalypt forests - Sustainable Timber Tasmania

View Source

Victoria Department of Environment, Land, Water and Planning (DELWP). (2022). TSCRA Tranche 1 Permanent Protections Report.

Regulatory Framework Journal

Victoria Department of Environment, Land, Water and Planning (DELWP). (2022). TSCRA Tranche 1 Permanent Protections Report.

View Source

Context

Region Australia
Biome Alpine and Subalpine Complex
Land Use Production Forestry
Assessment Conservation Target
Vegetation Forest
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 1
Effective From 3 Jun 2026

Notes

This threshold is particularly relevant in drier sites within the distribution of E. delegatensis. No upper detrimental threshold — higher values are always better up to natural saturation.

Related Benchmarks

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