Soil Nitrogen — Benchmark Detail

Benchmark Value

No specific value — see range

Range: 5000 to 1E+04 mg/kg

Optimal Range: 5000 to 1E+04

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.

Contributing Benchmarks

OptimalRange Primary Point Guard

Evidence & Context

Optimal Range: Characterized by a combination of high Total Nitrogen (e.g., 5,000–10,000 mg/kg on ferrosols), a low soil C:N ratio (<20) indicating efficient cycling, and negligible leachable nitrate (NO₃⁻) indicating high retention integrity.

Metric Definition:

Range of Total Nitrogen concentration representing optimal soil nitrogen status in ferrosol soils.

Benchmark Definition:

Optimal functional range of Total Nitrogen in soil indicating healthy nitrogen cycling and retention.

Justification:

This range reflects a large nitrogen capital cycled with high biological efficiency and retained with high integrity.

Sources (1)

Preview of Review of C:N Ratios in Vegetation, Litter and Soil Under Australian Native Forests and Plantations - DCCEEW

Review of C:N Ratios in Vegetation, Litter and Soil Under Australian Native Forests and Plantations - DCCEEW Journal

Review of C:N Ratios in Vegetation, Litter and Soil ... - DCCEEW

View Source

Supporting Sources (6)

Additional references from the underlying research that informed this benchmark.

A conceptual model of nitrogen dynamics for the Great Barrier Reef catchments - Griffith Research Online, accessed July 22, 2025,

Contextual Support Journal

A conceptual model of nitrogen dynamics for the Great Barrier Reef catchments - Griffith Research Online

View Source

Preview of Early response of soil properties and function to riparian rainforest restoration - Lake Baroon Catchment Care Group, accessed July 18, 2025,

Early response of soil properties and function to riparian rainforest restoration - Lake Baroon Catchment Care Group, accessed July 18, 2025,

Contextual Support GreyLiterature

Ecology of Nitrogen Fixing, Nitrifying, and Denitrifying ...

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Effects of long-term nitrogen and phosphorus additions on soil acidification in an N-rich tropical forest | Request PDF - ResearchGate

Contextual Support Journal

Report: Management of the Great Barrier Reef - Parliament of Australia

View Source

Maycock, Colin Rulzion (1998) Plant-soil nutrient relationships in ...

Contextual Support Journal

Australian Journal of Botany - CSIRO PUBLISHING, accessed July 19, 2025

View Source

Nutrient limitation of soil microbial processes in tropical forests - ResearchGate

Contextual Support

Nutrient limitation of soil microbial processes in tropical forests - ResearchGate

View Source

Remnant riparian rainforest restoration: Soil property and functional recovery in subtropical Australia.

Direct Evidence

Remnant riparian rainforest restoration: Soil property and functional recovery in subtropical Australia.

View Source

Context

Region Australia
Biome Tropical & Subtropical Rainforests
Land Use Conservation / Protected Natural Areas
Assessment Pristine Reference
Vegetation Forest
Evidence Type HealthyOperationalRange

Lifecycle

Status Active
Version 1
Effective From 10 Jun 2026

Notes

Optimal state includes high Total Nitrogen, low C:N ratio (<20), and negligible leachable nitrate.

Related Benchmarks

Other benchmarks in the AUS-TSR-CON-SON family.