Soil pH

AUS-TGP-FOR-SPH General Moderate confidence

Benchmark Value

4.8 pH
Direction: Lower is desirable ↓
Form: Point

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 2 benchmarks together — the OptimalRange form drives the primary score, while 1 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary Point Guard

Evidence & Context

A critical lower threshold is identified at pH(CaCl₂) 4.8, below which the mobilization of toxic aluminum ions severely compromises root health and violates the principles of Ecologically Sustainable Forest Management (ESFM).

Metric Definition:

Critical lower soil pH threshold below which aluminum toxicity impairs root health and ecosystem function.

Benchmark Definition:

Critical soil pH below which aluminum toxicity causes severe ecological harm in production forestry soils of the Temperate Grassy Woodlands & Plains biome.

Justification:

Consistent identification across multiple authoritative sources of pH 4.8 as the tipping point for aluminum toxicity and ecosystem degradation.

Sources (2)

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Additional references from the underlying research that informed this benchmark.

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Agriculture Victoria. (2024). Soil acidity.
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Agriculture Victoria. (2024). Soil acidity.
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Coops, N. C., Waring, R. H., & Landsberg, J. J. (1998). Assessing forest productivity in Australia and New Zealand using a physiologically-based model driven with averaged monthly weather data and satellite-derived estimates of canopy photosynthesis. Forest Ecology and Management, 104(1-3), 113-127.

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Government of South Australia, Department for Environment and Water. (n.d.). Soil Health and Condition.
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Graham, R. C., & Wilson, B. R. (2007). The influence of scattered trees on soil properties in temperate pastures. Soil Research, 45(2), 121-131.
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Grassy eucalypt woodland of the Victorian volcanic plain - listing advice, accessed August 4, 2025
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Guinto, D. F., et al. (2001). Long-term impacts of prescribed burning on soil chemical properties and forest floor nutrients in two contrasting native eucalypt forests in south-east Queensland. New Zealand Journal of Forestry Science, 31(2), 170-187.
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Context

  • Region Australia
  • Biome Temperate Grassy Woodlands & Plains
  • Land Use Production Forestry
  • Assessment Conservation Target
  • Vegetation Forest
  • Evidence Type DegradationThreshold

Lifecycle

  • Status Superseded
  • Version 1
  • Effective From 1 Jun 2026
  • Effective To 1 Jun 2026

Notes

Crossing below this threshold triggers acute aluminum toxicity, severely impairing root growth and forest productivity.

Related Benchmarks

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

7 pH Moderate
Production Forestry · Conservation Target · Forest
Point Active v2
— pH Moderate
Production Forestry · Conservation Target · Forest
OptimalRange Active v1