Ground Cover - Tree Canopy

AUS-TSR-CON-TCC General High confidence

Benchmark Value

50 %

Thresholds: Lower: 50, Upper: —

Direction: Higher is desirable ↑

Form: LowerThreshold

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 12 benchmarks together — the OptimalRange form drives the primary score, while 11 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MaximumOnly Guard MaximumOnly Guard OptimalRange Guard MinimumOnly Guard MaximumOnly Guard OptimalRange Guard LowerThreshold Guard UpperThreshold Guard LowerThreshold Guard OptimalRange Guard OptimalRange Guard

Evidence & Context

A TCC below 50% can be considered a critical threshold, indicating a significant loss of ecosystem integrity and a transition to a degraded state.

Metric Definition:

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

Benchmark Definition:

A Tree Canopy Cover (TCC) below 50% in Tropical and Subtropical Rainforests conservation areas indicates a critical threshold where ecosystem integrity is significantly lost and degradation occurs.

Justification:

This threshold is based on condition criteria for nationally listed Threatened Ecological Communities and BioCondition scoring system.

Sources (2)

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

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

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BioCondition: A condition assessment framework for terrestrial ... Journal

BioCondition: A condition assessment framework for terrestrial ...

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Supporting Sources (3)

Additional references from the underlying research that informed this benchmark.

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

Direct Evidence 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,

Direct Evidence Journal

BioCondition Benchmarks for Regional Ecosystem Condition Assessment - South East Queensland Bioregion

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Rampaging vines are slowly strangling tropical forests - Science News Explores

Contextual Support Journal

Approved Conservation Advice for the Lowland tropical rainforest of the Wet Tropics ecological community

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Context

Region Australia
Biome Tropical & Subtropical Rainforests
Land Use Conservation / Protected Natural Areas
Assessment Conservation Target
Vegetation Forest
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 1
Effective From 24 Mar 2026

Notes

Below this threshold, the ecosystem loses its defining closed-canopy structure and is considered degraded.

Related Benchmarks

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