Soil pH — Benchmark Detail

Benchmark Value

No specific value — see range

Range: 5.5 to 6.5 pH (CaCl₂)

Optimal Range: 5.5 to 6.5

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

Contributing Benchmarks

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

Evidence & Context

Based on this synthesis, the benchmark representing the best available condition for a conservation-managed Temperate Grassy Woodland is a moderately to slightly acidic soil within the range of pH(CaCl2) 5.5 to 6.5.

Metric Definition:

Soil pH measured in a slurry of soil and 0.01 M calcium chloride (pHCaCl2), representing the inherent acidity of the soil.

Benchmark Definition:

This benchmark defines the optimal soil pH range for conservation-managed Temperate Grassy Woodlands, indicating a moderately to slightly acidic soil that supports healthy ecosystem function.

Justification:

The benchmark is justified by multiple lines of evidence including avoidance of aluminium toxicity, optimal nutrient availability, native flora preferences, and sustainable soil management principles.

Sources (1)

Preview of (PDF) Temperate Woodland Conservation and Management. - ResearchGate

(PDF) Temperate Woodland Conservation and Management. - ResearchGate GreyLiterature

Full article: Birds on farms: a review of factors influencing bird occurrence in the temperate woodlands of south-eastern Australia - Taylor & Francis Online, accessed May 17, 2025

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Supporting Sources (10)

Additional references from the underlying research that informed this benchmark.

(PDF) Determining reference conditions for management and ..., accessed August 5, 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

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(PDF) The pH of Australian soils: field results from a national survey - ResearchGate, accessed July 25, 2025,

Contextual Support Journal

Caritat, P. de, & Cooper, M. (2011). The pH of Australian soils: Field results from a national survey. Soil Research, 49, 172-182.

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Agriculture Victoria. (2024). Soil acidity.

Contextual Support Government

Agriculture Victoria. (2025). Soil acidity. Farm Management.

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Australia's forests – overview - DAFF

Contextual Support

Approved Conservation Advice for the White Box - Yellow Box - Blakely's Red Gum Grassy Woodland and Derived Native Grassland - DCCEEW, accessed August 11, 2025,

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Growing with Acid Soils - ecobotanica, accessed August 11, 2025,

Contextual Support

Growing with Acid Soils - ecobotanica, accessed August 11, 2025,

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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 GreyLiterature

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

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Soil condition 2024 | NSW State of the Environment, accessed July 7, 2025,

Contextual Support Government

Soil pH | Environment, land and water - Queensland Government, accessed August 11, 2025,

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Soil nutrient critical limits | MBFP | More Beef from Pastures - MLA, accessed May 13, 2025,

Contextual Support Government

Understanding soil tests for pastures | Soil | Farm management ..., accessed July 17, 2025

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Soil pH - Wikipedia, accessed July 25, 2025,

Contextual Support GreyLiterature

Soil pH - Wikipedia, accessed August 11, 2025,

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Soil Research - CSIRO PUBLISHING, accessed July 16, 2025,

Contextual Support Journal

Soil Research - CSIRO PUBLISHING, accessed August 11, 2025,

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Context

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

Lifecycle

Status Active
Version 1
Effective From 9 Jun 2026

Notes

This range represents the best available condition for conservation-managed woodlands, safely above toxicity thresholds and consistent with high-quality remnant sites.

Related Benchmarks

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