Soil pH

AUS-TGP-FOR-SPH General High confidence

Benchmark Value

No specific value — see range
Range: 5 to 6.5 pH
Thresholds: Lower: 5, Upper: —
Optimal Range: 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 2 benchmarks together — the OptimalRange form drives the primary score, while 1 guard(s) constrain the result.

Evidence & Context

The recommended reference value for best available condition is a topsoil pH range of 5.0–6.5 (measured in 0.01M CaCl2).

Metric Definition:

Topsoil pH measured in 0.01M calcium chloride (CaCl2) solution, representing soil acidity/alkalinity affecting nutrient availability and ecosystem health.

Benchmark Definition:

Soil pH measured in 0.01M CaCl2 solution indicating the acidity or alkalinity of topsoil affecting nutrient availability and forest health.

Justification:

Derived from synthesis of scientific literature and expert horticultural guides identifying ideal conditions for nutrient availability and vigorous tree growth in Eucalyptus-based production forestry.

Sources (1)

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Symonds, W. L., et al. (2001). Response of ornamental Eucalyptus from acidic and alkaline habitats to potting medium pH. Scientia Horticulturae, 88(2), 121-131.

Symonds, W. L., et al. (2001). Response of ornamental Eucalyptus from acidic and alkaline habitats to potting medium pH. Scientia Horticulturae, 88(2), 121-131.

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Supporting Sources (76)

Additional references from the underlying research that informed this benchmark.

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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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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 ReferenceCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 15 Mar 2026

Notes

Represents the optimal soil pH range for achieving high ecological health and sustainable productivity in eucalypt-based production forestry.

Related Benchmarks

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