Ground Cover - Tree Canopy

AUS-TSR-CON-TCC General High confidence

Benchmark Value

No specific value — see range

Range: 70 to 90 %

Optimal Range: 70 to 90

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

Contributing Benchmarks

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

Evidence & Context

Therefore, a representative range for high-health, well-developed Tropical and Subtropical Rainforests in conservation areas is 70-90% TCC.

Metric Definition:

Tree Canopy Cover (TCC): This metric is defined as the percentage of ground area covered by the vertical projection of the outermost perimeter of tree crowns.

Justification:

The benchmark is derived from extensive field data collected at multiple 'best-on-offer' reference sites representing the healthiest remaining rainforests in conservation tenure, corroborated by independent field monitoring data.

Sources (2)

Preview of BioCondition benchmarks | Environment, land and water ..., accessed August 3, 2025,

BioCondition benchmarks | Environment, land and water ..., accessed August 3, 2025, Government

Appendix E TEC Lowland rainforest offset area monitoring report year 1 - Transport and Main Roads

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BioCondition Benchmarks for Regional Ecosystem ... - WordPress.com, accessed August 3, 2025, Journal

BioCondition Benchmarks for Regional Ecosystem ... - WordPress.com

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Supporting Sources (4)

Additional references from the underlying research that informed this benchmark.

Approved Conservation Advice for the Lowland tropical rainforest of ...

Regulatory Framework

Approved Conservation Advice for the Lowland tropical rainforest of ...

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BioCondition: A condition assessment framework for terrestrial ...

Methodology Source Journal

BioCondition: A condition assessment framework for terrestrial ...

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Rampaging vines are slowly strangling tropical forests - Science News Explores

Contextual Support Journal

Rampaging vines are slowly strangling tropical forests - Science News Explores

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The Ecology of Lianas and Their Role in Forests - e-Publications@Marquette

Contextual Support

The Ecology of Lianas and Their Role in Forests - e-Publications@Marquette

View Source

Context

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

Lifecycle

Status Superseded
Version 1
Effective From 9 Jun 2026
Effective To 9 Jun 2026

Notes

Lower Critical Threshold: 50 %. No upper detrimental threshold — higher values are always better up to natural saturation. The benchmark varies by local geology and forest type, with the highest values (70-90%) in wet, complex notophyll vine forests. The range represents a robust lower bound and upper bound for high-health rainforests under conservation management.

Related Benchmarks

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