Basal Area

AUS-AMR-AGR-BAS General Moderate confidence

Benchmark Value

5 m²/ha
Thresholds: Lower: —, Upper: 5
Direction: Higher is desirable ↑
Form: MaximumOnly

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 16 benchmarks together — the OptimalRange form drives the primary score, while 15 guard(s) constrain the result.

Evidence & Context

A Basal Area approaching or exceeding 5.0 m²/ha can be confidently identified as the upper detrimental threshold for a functional cropping system in this biome.

Metric Definition:

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

Benchmark Definition:

This benchmark marks the maximum basal area beyond which cropping becomes unsustainable due to competition for water in the biome.

Justification:

Empirical studies of tree-crop competition and yield loss in low-rainfall agroecosystems support this threshold.

Sources (1)

Preview of Derived from synthesis of Sudmeyer & Flugge (2005), Scanlan & Burrows (1990), and Sustainable Farms (2022) guidelines.
Derived from synthesis of Sudmeyer & Flugge (2005), Scanlan & Burrows (1990), and Sustainable Farms (2022) guidelines. Journal

Sudmeyer & Flugge (2005) 27

View Source

Context

  • Region Australia
  • Biome Arid Mountain Ranges & Uplands
  • Land Use Agricultural Crop Production
  • Assessment Pristine Reference
  • Evidence Type DegradationThreshold

Lifecycle

  • Status Active
  • Version 1
  • Effective From 19 Mar 2026

Notes

Above this threshold, severe competition for water leads to significant crop yield loss and agronomic unviability.