Soil Structure & Compaction

AUS-AMR-FOR-SSC General Low confidence

Benchmark Value

1500 kPa

Direction: Lower is desirable ↓

Form: MaximumOnly

Scoring Curve

This curve shows how a field measurement for this indicator would score across all available benchmark forms in this context.

Evidence & Context

The recommended benchmark of < 1500 kPa (measured at field capacity) is positioned as a conservative and achievable target for the "best available condition."

Metric Definition:

Penetrometer resistance (PR) measured at or near field capacity, indicating soil mechanical strength that affects root growth.

Benchmark Definition:

A conservative benchmark representing the best available soil condition under production forestry in the Arid Mountain Ranges & Uplands biome.

Justification:

Derived by synthesizing multiple lines of evidence including root-limiting thresholds for Australian native trees, analogue Mediterranean forest data, and biophysical principles of water-limited ecosystems.

Sources (1)

Preview of RELATIONSHIPS BETWEEN CONE PENETRATION RESISTANCE, BULK DENSITY, AND MOISTURE CONTENT IN UNCULTIVATED, REPACKED, AND CULTIVATED, accessed July 30, 2025,

RELATIONSHIPS BETWEEN CONE PENETRATION RESISTANCE, BULK DENSITY, AND MOISTURE CONTENT IN UNCULTIVATED, REPACKED, AND CULTIVATED, accessed July 30, 2025, Journal

Relationships between cone penetration resistance, bulk density, and moisture content in uncultivated, repacked, and cultivated hardsetting and non-hardsetting soils from the coastal lowlands of south-east Queensland, Australia

View Source

Supporting Sources (1)

Additional references from the underlying research that informed this benchmark.

Preview of The Influence of Compaction and Soil Strength on the Establishment of Four Australian Landscape Trees | Arboriculture & Urban Forestry

The Influence of Compaction and Soil Strength on the Establishment of Four Australian Landscape Trees | Arboriculture & Urban Forestry

Direct Evidence Journal

Resistance and resilience of the forest soil microbiome to logging ...

View Source

Context

Region Australia
Biome Arid Mountain Ranges & Uplands
Land Use Production Forestry
Assessment Not Stated
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 7 Jun 2026

Notes

No upper detrimental threshold — higher values are always worse beyond this limit. This is a proxy benchmark due to the absence of direct data for the specified context. It is set below the empirically determined threshold where significant root impedance begins for Australian native trees. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

Other benchmarks in the AUS-AMR-FOR-SSC family.