Soil Structure & Compaction

AUS-TSR-CON-SSC General Moderate confidence

Benchmark Value

2000 kPa

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 6 benchmarks together — the OptimalRange form drives the primary score, while 5 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MaximumOnly Guard MaximumOnly Guard MinimumOnly Guard MinimumOnly Guard MinimumOnly Guard

Evidence & Context

Proposed Benchmark: A penetrometer resistance of < 500 kPa is a defensible estimate for a healthy, minimally compacted soil in an Australian tropical or subtropical rainforest conservation area.

Metric Definition:

Penetrometer resistance measured at or near field capacity representing soil compaction level.

Benchmark Definition:

Penetrometer resistance indicating minimal soil compaction in rainforest conservation areas.

Justification:

This value is inferred from strong proxy indicators (Bulk Density: 0.6-0.8 g/cm3; Infiltration: >1400 mm/hr) from remnant rainforest reference sites on Ferrosols and supported by trampling studies.

Sources (2)

Preview of Criteria and Indicators for Sustainable Forest Management in Victoria, accessed July 19, 2025

Criteria and Indicators for Sustainable Forest Management in Victoria, accessed July 19, 2025 Journal

Soil health: the foundation of sustainable agriculture - 2001 ...

View Source

Early Response of Soil Properties and Function to Riparian ... Journal

Early Response of Soil Properties and Function to Riparian ...

View Source

Supporting Sources (3)

Additional references from the underlying research that informed this benchmark.

(PDF) How the Soil Resistance to Penetration Affects the Development of Agricultural Crops? - ResearchGate

Contextual Support Journal

(PDF) How the Soil Resistance to Penetration Affects the Development of Agricultural Crops? - ResearchGate

View Source

Australian Soils and Landscapes | Monitoring & Data | TERN - esoil.io, accessed July 30, 2025,

Direct Evidence Government

Australian Soils and Landscapes | Monitoring & Data | TERN - esoil.io, accessed July 17, 2025,

View Source

Safflower root and shoot growth affected by soil compaction - SciELO, accessed August 4, 2025,

Direct Evidence

Safflower root and shoot growth affected by soil ... - SciELO Brasil

View Source

Context

Region Australia
Biome Tropical & Subtropical Rainforests
Land Use Conservation / Protected Natural Areas
Assessment Pristine Reference
Vegetation Forest
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 21 Mar 2026

Notes

Measurement should be taken at or near field capacity. The value represents a minimally compacted state characteristic of a healthy, undisturbed rainforest soil. ConsistencyResolver applied 2026-03-23 00:15 UTC: BenchmarkValue 500 → 2000 (check: MinAboveMax, rationale: Swapping values to correct form assignment: the MaximumOnly benchmark (ID=1411) should have the higher threshold (2000 kPa) as it represents an upper degradation limit. This aligns with the Notes stating >2000 kPa impedes root growth.)

Related Benchmarks

Other benchmarks in the AUS-TSR-CON-SSC family.