Basal Area

AUS-AKW-AGR-BAS General Moderate confidence

Benchmark Value

No specific value — see range
Range: 1 to 1.5 m²/ha
Thresholds: Lower: 0.5, Upper: 2.5
Optimal Range: 1 to 1.5
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 16 benchmarks together — the OptimalRange form drives the primary score, while 15 guard(s) constrain the result.

Contributing Benchmarks

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

Evidence & Context

Basal Area 1.0 – 1.5 m²/ha derived benchmark based on analysis of analogous high-condition vegetation communities from the Terrestrial Ecosystem Research Network (TERN) AusPlots dataset.

Metric Definition:

Basal area of trees and shrubs in square meters per hectare (m²/ha)

Benchmark Definition:

This benchmark represents the basal area of trees and shrubs in the Arid Karstic Woodlands & Shrublands biome under agricultural crop production, indicating the typical range of basal area found in high-condition vegetation communities.

Sources (15)

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ausplotsR: TERN AusPlots Australian Ecosystem Monitoring Data - CRAN - R Project, accessed May 19, 2025

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basal_area: Basal area of tree trunks in TERN AusPlots in ternaustralia/ausplotsR - rdrr.io, accessed July 23, 2025 GreyLiterature

basal_area: Basal area of tree trunks in TERN AusPlots in ternaustralia/ausplotsR - rdrr.io, accessed July 21, 2025

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Dryland ecohydrology and climate change: critical issues and technical advances - HESS, accessed July 23, 2025

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Ecohydrology: Vegetation Function, Water and Resource Management - ResearchGate, accessed July 23, 2025

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Supporting Sources (25)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Late-Holocene environmental change on the Nullarbor Plain, southwest Australia, based on speleothem pollen records - ResearchGate, accessed July 23, 2025
(PDF) Late-Holocene environmental change on the Nullarbor Plain, southwest Australia, based on speleothem pollen records - ResearchGate, accessed July 23, 2025
Contextual Support Government

Acacia papyrocarpa (Leguminosae) - Seeds of South Australia - Species Information - Department for Environment and Water, accessed July 23, 2025

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Preview of Acacia forest - DAFF, accessed July 23, 2025
Acacia forest - DAFF, accessed July 23, 2025
Contextual Support Journal

Acacia forest - DAFF, accessed July 23, 2025

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Preview of Acacia Forests and Woodlands - Australian Vegetation, accessed July 23, 2025
Acacia Forests and Woodlands - Australian Vegetation, accessed July 23, 2025
Contextual Support GreyLiterature

Land Clearing in Australia | Mulchtech - Mulchers | 0439 666 535 | Bushland Clearing | Vegetation Management in Australia | Site Preparation in Australia | Forestry Mulching in Australia | Stump Removal Services in Australia | Earthmoving in Australia | Excavation Services in Australia | Australian Habitat Restoration | Erosion Control in Australia | Environmental Clearing in Australia | Agricultural Land Clearing - TMC CANCELA® Australia, accessed July 23, 2025

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Preview of ARID LANDS OF AUSTRALIA - Open Research Repository, accessed July 15, 2025,
ARID LANDS OF AUSTRALIA - Open Research Repository, accessed July 15, 2025,
Contextual Support Journal

ARID LANDS OF AUSTRALIA - ANU Open Research, accessed July 22, 2025

View Source
Preview of Australia's Nullarbor Plain, the world's largest limestone plateau - YouTube, accessed July 23, 2025
Australia's Nullarbor Plain, the world's largest limestone plateau - YouTube, accessed July 23, 2025
Irrelevant

Australia's Nullarbor Plain, the world's largest limestone plateau - YouTube, accessed July 23, 2025

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Preview of Can simple, on-ground vegetation and soil measures reliably indicate the health of rangelands? An application in Australia's semi-arid woodlands - CSIRO Publishing, accessed July 30, 2025
Can simple, on-ground vegetation and soil measures reliably indicate the health of rangelands? An application in Australia's semi-arid woodlands - CSIRO Publishing, accessed July 30, 2025
Contextual Support Journal

on-ground vegetation and soil measures reliably indicate the health of rangelands? An application in Australia's semi-arid woodlands - CSIRO Publishing

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Preview of Coolibah – sentinels of the waterways (Eucalyptus coolabah) - Department for Environment and Water, accessed July 23, 2025
Coolibah – sentinels of the waterways (Eucalyptus coolabah) - Department for Environment and Water, accessed July 23, 2025
Contextual Support Journal

The-Potential-Use-for-Groundwater-Use-by-Vegetation-in-the-Aust.-Arid-Zone.pdf - Northern Territory Government, accessed July 23, 2025

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Preview of Eucalyptus oleosa - Wikipedia, accessed July 23, 2025
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Contextual Support GreyLiterature

Eucalyptus oleosa - Wikipedia, accessed July 23, 2025

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Preview of Functionality of Zonal Agroforestry Systems on Agricultural Land of Dry Territories - MDPI, accessed July 23, 2025
Functionality of Zonal Agroforestry Systems on Agricultural Land of Dry Territories - MDPI, accessed July 23, 2025
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Functionality of Zonal Agroforestry Systems on Agricultural Land of Dry Territories - MDPI, accessed July 23, 2025

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Impact of tree clearing on soil pH and nutrient availability in grazing systems of central Queensland, Australia - ResearchGate, accessed July 23, 2025
Contextual Support Journal

Impact of tree clearing on soil pH and nutrient availability in grazing systems of central Queensland, Australia - ResearchGate, accessed July 23, 2025

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Preview of Nullarbor - Department for Environment and Water, accessed July 27, 2025
Nullarbor - Department for Environment and Water, accessed July 27, 2025
Contextual Support Journal

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Preview of Nullarbor Crossing - Food and Travel, accessed July 23, 2025
Nullarbor Crossing - Food and Travel, accessed July 23, 2025
Irrelevant

Nullarbor Crossing - Food and Travel, accessed July 23, 2025

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Preview of Nullarbor National Park | national park, South Australia, Australia - Britannica, accessed July 23, 2025
Nullarbor National Park | national park, South Australia, Australia - Britannica, accessed July 23, 2025
Contextual Support GreyLiterature

Nullarbor National Park | national park, South Australia, Australia - Britannica, accessed July 23, 2025

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Preview of Nullarbor Plain - Wikipedia, accessed July 25, 2025,
Nullarbor Plain - Wikipedia, accessed July 25, 2025,
Contextual Support GreyLiterature

Nullarbor Plain - Wikipedia, accessed July 24, 2025

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Nullarbor Plain… - Landscape South Australia - Alinytjara Wilurara, accessed July 23, 2025
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NVIS Fact sheet MVG 22 – Chenopod shrublands, samphire shrublands and forblands - DCCEEW, accessed July 24, 2025
Contextual Support Journal

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Soil Reading - Australian Earth Science Education

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Context

  • Region Australia
  • Biome Arid Karstic Woodlands & Shrublands
  • Land Use Agricultural Crop Production
  • Assessment Pristine Reference
  • Evidence Type TargetCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 18 Mar 2026

Notes

Lower Critical Threshold: 0.5 m²/ha. Upper Detrimental Threshold: 2.5 m²/ha. Optimal range is 1 to 2 m²/ha. RangeFixup applied 2026-03-21 22:21 UTC: OptimalRangeHigh: 2 → 1.5; UpperBound: 1.5 → 2 [Migration] Original wider evidence range: 1 – 2 (retained OptimalRange: 1 – 1.5)