Basal Area
Benchmark Value
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.
Evidence & Context
Evidence suggests a critical threshold around 20 m²/ha. Below this, the forest is at high risk of functional degradation, including loss of canopy closure, weed invasion, and arrested succession.
Basal Area (BA) is a standard forestry metric that quantifies the density of a forest stand.
This benchmark marks the critical basal area threshold below which the subtropical rainforest is at high risk of functional degradation.
The convergence of evidence suggests that allowing Basal Area to fall below approximately 20 m²/ha places the ecosystem at high risk of functional collapse.
Sources (1)
Patterns of basal area increment, mortality and recruitment were related to logging intensity in subtropical rainforest in Australia over 35 years | Request PDF - ResearchGate
View SourceSupporting Sources (56)
Additional references from the underlying research that informed this benchmark.
(PDF) Ecological sensitivity of Australian rainforests to selective logging - ResearchGate, accessed July 20, 2025,
View Source(PDF) Reduced-impact logging: Challenges and opportunities, accessed July 20, 2025
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Australia's forests and forestry glossary - DAFF, accessed July 20, 2025,
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Dynamics of tree diversity in undisturbed and logged subtropical rainforest in Australia - CiteSeerX, accessed July 20, 2025,
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Ecology | Environment
Ecology | Environment, land and water | Queensland Government, accessed July 20, 2025,
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A review of forest practice codes in Australia, accessed July 20, 2025
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EJ Rudder
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Biodiversity | Australia state of the environment 2021
View SourceMapping Biodiversity and Setting Conservation Priorities for SE Queensland's Rainforests Using DNA Barcoding | PLOS One, accessed July 20, 2025,
View SourceNative Forest Stand Management Guide - No 1 - Private Forestry Service Queensland, accessed July 12, 2025,
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Quantifying the biodiversity values of reforestation: perspectives, design issues and outcomes in Australian rainforest landscapes | Conservation of Australia's Forest Fauna - Allen Press, accessed July 20, 2025,
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Sustainable Harvesting of Tropical Rainforests: Reply to Keto, Scott and Olsen JK Vanclay, EJ Rudder, G - UQ eSpace, accessed July 20, 2025
View SourceSustainable native forest management, accessed July 12, 2025,
View Source
Sustainable timber harvesting in the rainforests of ... - UQ eSpace, accessed July 20, 2025,
View SourceThinning - Agroforestry in Australia, accessed July 12, 2025,
View SourceBasal Area: A Measure Made for Management - Alabama Cooperative Extension System -, accessed July 15, 2025,
View SourceVegetation and floristics of a lowland tropical rainforest in northeast Australia, accessed July 20, 2025,
View Source