Basal Area

AUS-AMR-CON-BAS General Moderate confidence

Benchmark Value

2.5 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. The scoring engine uses 4 benchmarks together — the OptimalRange form drives the primary score, while 3 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MinimumOnly Guard OptimalRange Guard MinimumOnly Guard

Evidence & Context

Basal areas below approximately 2-3 m²/ha are associated with a loss of structural complexity that compromises habitat for native fauna and may increase the hunting success of invasive predators like feral cats.

Metric Definition:

Basal Area (BA), the cross-sectional area of tree stems per unit of land.

Benchmark Definition:

This benchmark represents the minimum basal area below which woodland structural complexity and habitat quality are compromised in Australia's arid montane biome.

Justification:

Below this threshold, the system becomes vulnerable to degradation and loss of structural complexity.

Supporting Sources (1)

Additional references from the underlying research that informed this benchmark.

Preview of Synthesis of TERN AusPlots Rangelands survey data (2011-2019) and national best-practice guidelines for invasive species management in Australian arid rangelands.
Synthesis of TERN AusPlots Rangelands survey data (2011-2019) and national best-practice guidelines for invasive species management in Australian arid rangelands.
Direct Evidence

researchportal.murdoch.edu.au, accessed May 10, 2025

View Source

Context

  • Region Australia
  • Biome Arid Mountain Ranges & Uplands
  • Land Use Conservation / Protected Natural Areas
  • Assessment Pristine Reference
  • Evidence Type DegradationThreshold

Lifecycle

  • Status Active
  • Version 1
  • Effective From 8 Jun 2026

Notes

This threshold aligns with qualitative descriptions of 'poor' ecosystem condition. No upper detrimental threshold — higher values are always better up to natural saturation.

Related Benchmarks

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

— m²/ha High
Conservation / Protected Natural Areas · Pristine Reference
OptimalRange Active v1