Basal Area — Benchmark Detail

Benchmark Value

2 m²/ha

Thresholds: Lower: —, Upper: 2

Direction: Higher is desirable ↑

Form: UpperThreshold

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 9 benchmarks together — the OptimalRange form drives the primary score, while 8 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary OptimalRange Guard OptimalRange Guard OptimalRange Guard Point Guard OptimalRange Guard OptimalRange Guard Point Guard UpperThreshold Guard

Evidence & Context

A BA below approximately 2 m²/ha is proposed as a lower critical threshold, below which woodland structure, regeneration capacity, and habitat provision are likely to be significantly impaired.

Metric Definition:

Basal Area (BA) is the sum of the cross-sectional areas of tree stems at breast height per unit land area.

Benchmark Definition:

A basal area below 2 m²/ha indicates a critical threshold below which woodland ecological structure and function are significantly impaired.

Justification:

This threshold is inferred from minimum condition criteria for EPBC Act listing and descriptions of degraded states in management guides.

Sources (1)

Preview of Approved Conservation Advice for the White Box - Yellow Box - Blakely's Red Gum Grassy Woodland and Derived Native Grassland - DCCEEW, accessed August 12, 2025,

Approved Conservation Advice for the White Box - Yellow Box - Blakely's Red Gum Grassy Woodland and Derived Native Grassland - DCCEEW, accessed August 12, 2025, Journal

Conservation Advice for Lowland Grassy Woodland in the South East Corner Bioregion, accessed August 6, 2025

View Source

Supporting Sources (3)

Additional references from the underlying research that informed this benchmark.

A guide to managing Box Gum Grassy Woodlands - DCCEEW, accessed August 4, 2025

Direct Evidence Journal

Soil moisture release curves—What they are. Why you need them. How to use them., accessed May 15, 2025,

View Source

Preview of Function Attribute Benchmarks for the Biodiversity Assessment Method: Data audit, compilation and analysis - Environment and Heritage, accessed July 10, 2025,

Function Attribute Benchmarks for the Biodiversity Assessment Method: Data audit, compilation and analysis - Environment and Heritage, accessed July 10, 2025,

Contextual Support

Function Attribute Benchmarks for the Biodiversity Assessment Method: Data audit, compilation and analysis - Environment and Heritage, accessed May 19, 2025

View Source