Basal Area — Benchmark Detail

Benchmark Value

No specific value — see range

Range: 3 to 6 m²/ha

Optimal Range: 3 to 6

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 19 benchmarks together — the OptimalRange form drives the primary score, while 18 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary Point Guard MaximumOnly Guard MinimumOnly Guard OptimalRange Guard OptimalRange Guard MaximumOnly Guard MaximumOnly Guard MinimumOnly Guard MaximumOnly Guard OptimalRange Guard MinimumOnly Guard MaximumOnly Guard OptimalRange Guard MinimumOnly Guard Point Guard MinimumOnly Guard MaximumOnly Guard OptimalRange Guard

Evidence & Context

The analysis indicates a mean Basal Area within these high-health reference sites of approximately 4.5 m²/ha. To account for natural variability across different soil types and rainfall gradients within the biome, it is more appropriate to represent this benchmark as a range. The data from these exclosure sites support a reference range of 3.0 to 6.0 m²/ha.

Metric Definition:

Basal Area (m²/ha) as a measure of woody vegetation structure

Benchmark Definition:

Basal Area is the cross-sectional area of tree stems per hectare, representing woody vegetation structure in arid shrublands under agricultural crop production.

Justification:

This benchmark is derived from long-term grazing exclosures representing the best available proxy for high-health woody vegetation structure in the absence of degrading land use.

Sources (1)

Preview of The Rangeland Journal - CSIRO PUBLISHING, accessed July 6, 2025,

The Rangeland Journal - CSIRO PUBLISHING, accessed July 6, 2025, Journal

Does grazing exclusion in Australia's rangelands affect biomass and debris carbon stocks? - CSIRO Publishing

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Supporting Sources (9)

Additional references from the underlying research that informed this benchmark.

ARS Broome 2023 - EventsAir

Irrelevant

ARS Broome 2023 - EventsAir

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Australia state of the environment 2021: land, accessed May 11, 2025

Contextual Support Journal

Buffel grass in Queensland's semi-arid woodlands - CSIRO Publishing, accessed July 13, 2025

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Australia's Native Vegetation Framework - DAFF, accessed August 6, 2025,

Contextual Support Journal

risks and impacts of plant industries on soil condition - Department of Agriculture and Fisheries

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Biodiversity - Environment and Heritage, accessed July 8, 2025

Contextual Support

Australia state of the environment 2021: land

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BIODIVERSITY - EPA, South Australia

Contextual Support Journal

BIODIVERSITY - EPA, South Australia

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Description of Ecological Communities: Arid Eucalypt Woodlands - NEC 1.8 to 1.13 - DCCEEW, accessed July 23, 2025

Contextual Support Journal

Description of Ecological Communities: Arid Eucalypt Woodlands - NEC 1.8 to 1.13 - DCCEEW

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Maximizing retention of native biodiversity in Australian agricultural ...

Contextual Support Journal

Does grazing exclusion in Australia's rangelands affect biomass and debris carbon stocks? - CSIRO Publishing, accessed April 29, 2025,

View Source

Productivity of Mallee Agroforestry Systems - — The ... - DBCA Library

Direct Evidence Journal

Productivity of Mallee Agroforestry Systems - — The ... - DBCA Library

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Preview of Quantifying vegetation and canopy structural complexity from terrestrial LiDAR data using the forestr R package | Request PDF - ResearchGate

Quantifying vegetation and canopy structural complexity from terrestrial LiDAR data using the forestr R package | Request PDF - ResearchGate

Methodology Source Journal

Quantifying vegetation and canopy structural complexity from terrestrial LiDAR data using the forestr R package | Request PDF - ResearchGate

View Source

Context

Region Australia
Biome Arid Shrublands & Stony Plains
Land Use Agricultural Crop Production
Assessment Not Stated
Evidence Type ReferenceCondition

Lifecycle

Status Superseded
Version 1
Effective From 7 Jun 2026
Effective To 7 Jun 2026

Notes

No upper detrimental threshold — higher values are always better up to natural saturation. This range encapsulates the typical structural diversity found in healthy, mature arid shrublands protected from long-term grazing pressure. It is a scientifically measured recovery target relevant to regenerative land management. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

Other benchmarks in the AUS-ASP-AGR-BAS family.