Soil Structure & Compaction

AUS-AMR-FOR-SSC General Moderate confidence

Benchmark Value

1500 kPa

Thresholds: Lower: —, Upper: 3500

Direction: Higher 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. The scoring engine uses 13 benchmarks together — the OptimalRange form drives the primary score, while 12 guard(s) constrain the result.

Contributing Benchmarks

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

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 affecting root growth.

Benchmark Definition:

Penetrometer resistance as a measure of soil compaction affecting root growth and soil health in arid mountain upland forests under production forestry.

Justification:

Derived by synthesizing multiple lines of evidence including root-limiting compaction thresholds for Australian native trees and long-term data from analogous managed forests.

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

Australia's State of the Forests Report, accessed May 15, 2025

View Source

Context

Region Australia
Biome Arid Mountain Ranges & Uplands
Land Use Production Forestry
Assessment Pristine Reference
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 21 Mar 2026

Notes

This is a proxy benchmark due to the absence of direct data for the specified context. The functional range for this system is defined by an optimal zone of 500-2000 kPa. Lower critical threshold >2500 kPa and upper detrimental threshold >3500 kPa are also identified. ConsistencyResolver applied 2026-03-23 00:20 UTC: UpperThreshold 1500 → 3500 (check: MinAboveMax, rationale: The Notes describe 3500 kPa as the upper detrimental threshold, so the MaximumOnly benchmark should have UpperThreshold=3500, not 1500.)

Related Benchmarks

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