Soil Structure & Compaction

AUS-TGP-CON-SSC General Moderate confidence

Benchmark Value

1000 kPa
Thresholds: Lower: 1000, Upper: —
Direction: Lower is desirable ↓
Form: LowerThreshold

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 8 benchmarks together — the OptimalRange form drives the primary score, while 7 guard(s) constrain the result.

Contributing Benchmarks

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

Evidence & Context

Scientific literature identifies a penetrometer resistance of 1035 kPa as the level at which a soil layer becomes restrictive to root growth in the top 15 cm of soil. Crossing this threshold, here rounded to 1000 kPa, signifies that the soil's physical structure is beginning to compromise key ecological functions.

Metric Definition:

Penetrometer resistance threshold marking onset of ecological impairment due to soil compaction.

Benchmark Definition:

This benchmark marks the threshold where soil compaction begins to restrict root growth and compromise ecosystem functions in temperate grassy woodlands under conservation management.

Justification:

Rounded from 1035 kPa based on scientific literature to provide a clear management target.

Sources (1)

Preview of Soil Health Assessment Part IV: Soil Penetration Resistance and Plant Roots – Soil and Water Conservation Laboratory Manual - New Prairie Press Open Book Publishing, accessed August 11, 2025
Soil Health Assessment Part IV: Soil Penetration Resistance and Plant Roots – Soil and Water Conservation Laboratory Manual - New Prairie Press Open Book Publishing, accessed August 11, 2025 Journal

The Influence of Compaction and Soil Strength on the Establishment of Four Australian Landscape Trees | Request PDF - ResearchGate, accessed July 24, 2025

View Source

Supporting Sources (28)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) The effect of soil compaction on germination and early growth ..., accessed August 4, 2025,
(PDF) The effect of soil compaction on germination and early growth ..., accessed August 4, 2025,
Contextual Support Journal

Soil compaction - practical considerations - Forest Research, accessed August 11, 2025

View Source
Preview of A Global Meta-Analysis of Grazing Impacts on Soil Health Indicators - ResearchGate, accessed August 11, 2025
A Global Meta-Analysis of Grazing Impacts on Soil Health Indicators - ResearchGate, accessed August 11, 2025
Contextual Support Journal

Soil compaction effects on grassland silage yields and soil structure under different levels of compaction over three years | Request PDF - ResearchGate, accessed August 11, 2025

View Source
Preview of A Global Meta-Analysis of Grazing Impacts on Soil Health Indicators - ResearchGate, accessed July 30, 2025,
A Global Meta-Analysis of Grazing Impacts on Soil Health Indicators - ResearchGate, accessed July 30, 2025,
Contextual Support Journal

A Global Meta-Analysis of Grazing Impacts on Soil Health Indicators - ResearchGate, accessed July 10, 2025,

View Source
Preview of An Updated Australian Soil Classification Map | TERN Australia, accessed on June 5, 2025
An Updated Australian Soil Classification Map | TERN Australia, accessed on June 5, 2025
Contextual Support Government

An Updated Australian Soil Classification Map | TERN Australia, accessed August 4, 2025,

View Source
Preview of Australia's protected areas - DCCEEW, accessed August 4, 2025,
Australia's protected areas - DCCEEW, accessed August 4, 2025,
Contextual Support Government

Environmental Indicators for National State of the Environment Reporting: The Land

View Source
Preview of Australian Soils and Landscapes | Monitoring & Data | TERN - esoil.io, accessed August 11, 2025
Australian Soils and Landscapes | Monitoring & Data | TERN - esoil.io, accessed August 11, 2025
Contextual Support Government

Australian Soils and Landscapes | Monitoring & Data | TERN - esoil.io, accessed August 11, 2025

View Source
Preview of Biodiversity Conservation Trust Livestock grazing guidelines, accessed August 6, 2025
Biodiversity Conservation Trust Livestock grazing guidelines, accessed August 6, 2025
Contextual Support

www.dpi.nsw.gov.au, accessed April 29, 2025,

View Source
Preview of Box Gum Grassy Woodland - Local Land Services - NSW Government, accessed August 9, 2025
Box Gum Grassy Woodland - Local Land Services - NSW Government, accessed August 9, 2025
Contextual Support Government

GRASSLANDS & GRASSY WOODLANDS - Corangamite Catchment Management Authority, accessed August 11, 2025

View Source
Preview of Comparison of grazed and cleared temperate grassy woodlands in eastern Australia: patterns in space and inferences in time - ResearchGate, accessed July 10, 2025,
Comparison of grazed and cleared temperate grassy woodlands in eastern Australia: patterns in space and inferences in time - ResearchGate, accessed July 10, 2025,
Contextual Support Journal

Comparison of grazed and cleared temperate grassy woodlands in eastern Australia: patterns in space and inferences in time - ResearchGate

View Source
Preview of Conservation at Mulligans Flat Nature Reserve - Suzanne Orr, accessed August 11, 2025
Conservation at Mulligans Flat Nature Reserve - Suzanne Orr, accessed August 11, 2025
Contextual Support Government

Mulligans Flat Nature Reserve - Parks ACT, accessed August 11, 2025

View Source
Preview of Critical review of the impacts of grazing intensity on soil organic carbon storage and other soil quality indicators in extensively managed grasslands - PubMed Central, accessed August 11, 2025
Critical review of the impacts of grazing intensity on soil organic carbon storage and other soil quality indicators in extensively managed grasslands - PubMed Central, accessed August 11, 2025
Contextual Support GreyLiterature

Critical review of the impacts of grazing intensity on soil organic carbon storage and other soil quality indicators in extensively managed grasslands - PubMed Central, accessed August 11, 2025

View Source
Preview of Critical review of the impacts of grazing intensity on soil organic carbon storage and other soil quality indicators in extensively managed grasslands - PubMed Central, accessed August 5, 2025,
Critical review of the impacts of grazing intensity on soil organic carbon storage and other soil quality indicators in extensively managed grasslands - PubMed Central, accessed August 5, 2025,
Contextual Support Journal

Biodiversity Conservation Trust Livestock grazing guidelines, accessed August 11, 2025

View Source
Preview of Environmental Stewardship - Box Gum Grassy Woodland Project - Information Booklet - DCCEEW, accessed August 12, 2025,
Environmental Stewardship - Box Gum Grassy Woodland Project - Information Booklet - DCCEEW, accessed August 12, 2025,
Contextual Support Journal

Effects of Stock Grazing on Biodiversity Values in Temperate Native Grasslands and Grassy Woodlands in SE Australia: A Literature Review - ACT Government, accessed August 12, 2025,

View Source
Preview of GRASSLANDS & GRASSY WOODLANDS - Corangamite Catchment Management Authority, accessed August 5, 2025,
GRASSLANDS & GRASSY WOODLANDS - Corangamite Catchment Management Authority, accessed August 5, 2025,
Contextual Support Journal

(PDF) Identifying ecological barriers to restoration in temperate ..., accessed August 11, 2025

View Source
Preview of How Does Soil Compaction Impact Grazing Lands? - ATTRA – Sustainable Agriculture, accessed August 11, 2025
How Does Soil Compaction Impact Grazing Lands? - ATTRA – Sustainable Agriculture, accessed August 11, 2025
Contextual Support GreyLiterature

How Does Soil Compaction Impact Grazing Lands? - ATTRA – Sustainable Agriculture, accessed August 11, 2025

View Source
Preview of Identifying ecological barriers to restoration in temperate grassy woodlands: soil changes associated with different degradation states - ResearchGate, accessed August 5, 2025,
Identifying ecological barriers to restoration in temperate grassy woodlands: soil changes associated with different degradation states - ResearchGate, accessed August 5, 2025,
Contextual Support Journal

(PDF) Identifying ecological barriers to restoration in temperate grassy woodlands: soil changes associated with different degradation states - ResearchGate, accessed August 4, 2025,

View Source
Preview of Indigenous land management in Australia: extent, scope, diversity, barriers and success factors - CSIRO Research Publications Repository, accessed August 11, 2025
Indigenous land management in Australia: extent, scope, diversity, barriers and success factors - CSIRO Research Publications Repository, accessed August 11, 2025
Contextual Support GreyLiterature

Healthy Land & Water, accessed August 11, 2025

View Source
Preview of Management approaches | Australia state of the environment 2021, accessed August 11, 2025
Management approaches | Australia state of the environment 2021, accessed August 11, 2025
Contextual Support Government

Management approaches | Australia state of the environment 2021, accessed August 11, 2025

View Source
Preview of National Soil Monitoring Program - CSIRO, accessed August 4, 2025,
National Soil Monitoring Program - CSIRO, accessed August 4, 2025,
Contextual Support GreyLiterature

National Soil Monitoring Program - CSIRO

View Source
Preview of National Soil Monitoring Program | NRM North, accessed August 11, 2025
National Soil Monitoring Program | NRM North, accessed August 11, 2025
Contextual Support GreyLiterature

How compaction varies by region in Australia - Conplant, accessed August 11, 2025

View Source
Preview of NVIS Fact sheet MVG 5 – Eucalypt woodlands - DCCEEW, accessed August 5, 2025,
NVIS Fact sheet MVG 5 – Eucalypt woodlands - DCCEEW, accessed August 5, 2025,
Contextual Support Journal

Grey Box (Eucalyptus microcarpa) Grassy Woodlands and Derived Native Grasslands of South-eastern Australia, accessed August 12, 2025,

View Source
Preview of Overgrazing & Reducing Grazing Pressure | Bush Heritage Australia, accessed August 11, 2025
Overgrazing & Reducing Grazing Pressure | Bush Heritage Australia, accessed August 11, 2025
Contextual Support Government

Reshaping forest management in Australia to provide nature-based solutions to global challenges, accessed July 24, 2025

View Source
Preview of PENETRATION RESISTANCE - CIMMYT Repository, accessed August 11, 2025
PENETRATION RESISTANCE - CIMMYT Repository, accessed August 11, 2025
Irrelevant

PENETRATION RESISTANCE - CIMMYT Repository, accessed August 11, 2025

View Source
Preview of Research — Mulligans Flat, accessed August 11, 2025
Research — Mulligans Flat, accessed August 11, 2025
Contextual Support GreyLiterature

Mulligans Flat, accessed August 11, 2025

View Source
Preview of The effects of compaction and soil drying on penetrometer resistance - ResearchGate, accessed August 2, 2025,
The effects of compaction and soil drying on penetrometer resistance - ResearchGate, accessed August 2, 2025,
Contextual Support Journal

soils - of the australian alps, accessed August 11, 2025

View Source
Preview of Woodlands - DCCEEW, accessed August 5, 2025,
Woodlands - DCCEEW, accessed August 5, 2025,
Contextual Support

Woodlands - DCCEEW, accessed May 19, 2025

View Source
Preview of www.forestresearch.gov.uk, accessed August 11, 2025
www.forestresearch.gov.uk, accessed August 11, 2025
Contextual Support Government

www.forestresearch.gov.uk, accessed August 11, 2025

View Source
Preview of Yellow Box – Red Gum Grassy Woodland, accessed August 12, 2025,
Yellow Box – Red Gum Grassy Woodland, accessed August 12, 2025,
Contextual Support Journal

Box Gum Grassy Woodland - Local Land Services - NSW Government, accessed August 11, 2025

View Source

Context

  • Region Australia
  • Biome Temperate Grassy Woodlands & Plains
  • Land Use Conservation / Protected Natural Areas
  • Assessment Conservation Target
  • Vegetation Woodland
  • Evidence Type DegradationThreshold

Lifecycle

  • Status Active
  • Version 1
  • Effective From 21 Mar 2026

Notes

This threshold marks the beginning of compromised ecosystem function and reduced resilience.

Related Benchmarks

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

— kPa Moderate
Conservation / Protected Natural Areas · Conservation Target · Woodland
OptimalRange Active v1
2000 kPa Moderate
Conservation / Protected Natural Areas · Conservation Target · Woodland
MinimumOnly Active v1