Basal Area — Benchmark Detail

Benchmark Value

No specific value — see range

Range: 28.6 to 63.3 m²/ha

Optimal Range: 28.6 to 63.3

Direction: Higher is desirable ↑

Form: OptimalRange

Evidence & Context

Based on the available evidence, there is no support for the concept of a detrimental upper threshold for basal area in naturally functioning, protected Australian rainforests.

Metric Definition:

Stand basal area as the sum of cross-sectional areas of living tree stems ≥10 cm DBH per hectare.

Benchmark Definition:

This benchmark indicates that no detrimental upper threshold exists for basal area in protected Australian tropical rainforests; the upper value represents natural saturation.

Justification:

Ecosystem self-regulation through competition and natural disturbance prevents biomass accumulation beyond natural carrying capacity.

Sources (1)

CSIRO Permanent Rainforest Plots of North Queensland, accessed July 20, 2025, Government

CSIRO Permanent Rainforest Plots of North Queensland

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Supporting Sources (4)

Additional references from the underlying research that informed this benchmark.

Lowland Rainforest of Subtropical Australia ecological community - conservation advice

Contextual Support Government

Lowland Rainforest of Subtropical Australia ecological community - conservation advice

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Lowland Rainforest of Subtropical Australia ecological community - listing advice

Contextual Support Journal

Lowland Rainforest of Subtropical Australia ecological community - listing advice

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Patterns of basal area increment, mortality and recruitment were ..., accessed July 20, 2025,

Direct Evidence Journal

Patterns of basal area increment, mortality and recruitment were related to logging intensity in subtropical rainforest in Australia over 35 years | Request PDF - ResearchGate

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Stand basal area, accessed July 12, 2025,

Contextual Support

Vegetation and floristics of a lowland tropical rainforest in northeast Australia - Biodiversity Data Journal

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Context

Region Australia
Biome Tropical & Subtropical Rainforests
Land Use Conservation / Protected Natural Areas
Assessment Pristine Reference
Vegetation Forest
Evidence Type HealthyOperationalRange

Lifecycle

Status Retired
Version 1
Effective From 7 Jun 2026

Notes

The upper value (~63 m²/ha) is a natural saturation point, not a state of declining health.

Related Benchmarks

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