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
Multiple lines of evidence converge to indicate that basal areas exceeding approximately 40 m²/ha become detrimental to the ecosystem's identity and health.
Basal Area (BA) is the total cross-sectional area of all tree stems in a given stand, measured at 1.3 meters above the ground (DBH), expressed as square meters per hectare (m²/ha).
A basal area above 40 m²/ha marks the upper detrimental threshold where woodland character and biodiversity collapse.
Basal areas above 40 m²/ha lead to loss of woodland character, understorey biodiversity collapse, and reduced value for grazing.
Sources (3)
Biodiversity Conservation Trust Ecological Thinning Guidelines
View Source
2019–20 Wildfires - Forestry Corporation
View SourceGrassy eucalypt woodland of the Victorian volcanic plain - listing advice
View SourceSupporting Sources (2)
Additional references from the underlying research that informed this benchmark.
Ecologically sustainable forest management - Local Land Services - NSW Government
View Sourceguidelines for sustainable forestry on private lands ... - ResearchGate
View Source