Basal Area — Benchmark Detail

Benchmark Value

No specific value — see range

Range: 45 to 50 m²/ha

Thresholds: Lower: —, Upper: 50

Optimal Range: 45 to 50

Direction: Lower 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 OptimalRange Guard OptimalRange Guard OptimalRange Guard Point Guard OptimalRange Guard OptimalRange Guard Point Guard UpperThreshold Guard

Evidence & Context

Values significantly exceeding 45-50 m²/ha may indicate a stand under high competitive stress and increased vulnerability to climate-driven drought, representing a potential detrimental upper threshold.

Metric Definition:

Basal area in m²/ha

Benchmark Definition:

Basal area values above 45-50 m²/ha indicate high competitive stress and increased vulnerability to drought, representing a detrimental upper threshold in the tropical and subtropical maritime island biome under conservation land use.

Justification:

Based on evidence linking high basal area with increased vulnerability to drought and climate stress.

Sources (1)

Preview of Managing drought-sensitive forests under global change. Low competition enhances long-term growth and water uptake in Abies pinsapo | Request PDF - ResearchGate

Managing drought-sensitive forests under global change. Low competition enhances long-term growth and water uptake in Abies pinsapo | Request PDF - ResearchGate Journal

Managing drought-sensitive forests under global change. Low competition enhances long-term growth and water uptake in Abies pinsapo | Request PDF - ResearchGate

View Source

Supporting Sources (2)

Additional references from the underlying research that informed this benchmark.

(PDF) Thresholds of biodiversity and ecosystem function in a forest ...

Contextual Support GreyLiterature

(PDF) Thresholds of biodiversity and ecosystem function in a forest ...

View Source

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

Direct Evidence Journal

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

View Source

Context

Region Australia
Biome Tropical & Subtropical Maritime Islands
Land Use Conservation / Protected Natural Areas
Assessment Conservation Target
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 3
Effective From 22 Mar 2026

Notes

Represents a state of reduced resilience and heightened vulnerability to drought and heat events.

Related Benchmarks

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