Soil Phosphorus

AUS-TMS-FOR-SOP General Moderate confidence

Benchmark Value

No specific value — see range
Range: 100 to 250 mg/kg
Optimal Range: 100 to 250
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 3 benchmarks together — the OptimalRange form drives the primary score, while 2 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary OptimalRange Guard MinimumOnly Guard

Evidence & Context

Proposed Target Reference Range for Total P (0-10 cm): 100 - 250 mg/kg

Metric Definition:

Total Phosphorus (Total P) in topsoil (0-10 cm)

Benchmark Definition:

This benchmark defines the natural target range for total soil phosphorus in the top 10 cm of soil in Tropical Monsoonal Savannas under production forestry, reflecting the typical phosphorus levels in undisturbed conditions.

Justification:

Reflects the inherently P-poor, ancient, and weathered nature of these savanna soils, encapsulating values observed at Darwin and Gove sites.

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Context

  • Region Australia
  • Biome Tropical Monsoonal Savannas
  • Land Use Production Forestry
  • Assessment Pristine Reference
  • Vegetation Tropical Monsoonal Savannas
  • Evidence Type ReferenceCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 9 Jun 2026

Notes

Reference range for topsoil (0-10 cm).

Related Benchmarks

Other benchmarks in the AUS-TMS-FOR-SOP family.

— mg/kg Moderate
Production Forestry · Pristine Reference · Tropical Monsoonal Savannas
OptimalRange Active v1
75 mg/kg Moderate
Production Forestry · Pristine Reference · Tropical Monsoonal Savannas
MinimumOnly Active v1
3 mg/kg Moderate
Production Forestry · Pristine Reference · Tropical Monsoonal Savannas
MinimumOnly Active v1
350 mg/kg Moderate
Production Forestry · Conservation Target · Tropical Monsoonal Savannas
MaximumOnly Active v1
20 mg/kg Moderate
Production Forestry · Conservation Target · Tropical Monsoonal Savannas
MaximumOnly Active v1