Soil Nitrogen

AUS-TSR-FOR-SON General Moderate confidence

Benchmark Value

2500 mg/kg

Direction: Higher is desirable ↑

Form: MinimumOnly

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 4 benchmarks together — the OptimalRange form drives the primary score, while 3 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary Point Guard Point Guard MinimumOnly Guard

Evidence & Context

A Lower Critical Threshold is identified at approximately 2500 mg/kg, below which nitrogen availability becomes a significant limiting factor for forest health and productivity, as observed in second-rotation plantations.

Metric Definition:

Total Soil Nitrogen in the topsoil (0-10 cm)

Benchmark Definition:

This threshold represents the minimum total soil nitrogen in the topsoil (0-10 cm) below which nitrogen availability limits forest health and productivity in subtropical production forestry.

Justification:

This threshold is based on observed nitrogen deficiency in second-rotation plantations and supported by evidence of growth limitation and fertilizer application necessity.

Supporting Sources (28)

Additional references from the underlying research that informed this benchmark.

Preview of Carbon and Nitrogen Mineralization in Relation to Soil Particle-Size Fractions after 32 Years of Chemical and Manure Application in a Continuous Maize Cropping System, accessed July 19, 2025

Carbon and Nitrogen Mineralization in Relation to Soil Particle-Size Fractions after 32 Years of Chemical and Manure Application in a Continuous Maize Cropping System, accessed July 19, 2025

Contextual Support Journal

Soil carbon and nutrient pools, microbial properties and gross nitrogen transformations in adjacent natural forest and hoop pine, accessed July 20, 2025,

Preview of Hoop pine - Araucaria (plantations), accessed July 19, 2025,

Hoop pine - Araucaria (plantations), accessed July 19, 2025,

Contextual Support Journal

www.scionresearch.com

Preview of Impacts of forest conversion to plantations on the soil carbon and ..., accessed July 19, 2025,

Impacts of forest conversion to plantations on the soil carbon and ..., accessed July 19, 2025,

Contextual Support Journal

Impacts of forest conversion to plantations on the soil carbon and ..., accessed July 19, 2025,

Preview of IN SITU MEASUREMENTS OF SOIL MINERAL ... - CiteSeerX, accessed July 19, 2025,

IN SITU MEASUREMENTS OF SOIL MINERAL ... - CiteSeerX, accessed July 19, 2025,

Irrelevant Government

Hoop pine | Business Queensland, accessed July 19, 2025,

Preview of Influence of environmental conditions and some soil chemical properties on the carbon and nitrogen contents of some tropical Australian rainforest soils - CSIRO PUBLISHING | Soil Research, accessed August 2, 2025

Influence of environmental conditions and some soil chemical properties on the carbon and nitrogen contents of some tropical Australian rainforest soils - CSIRO PUBLISHING | Soil Research, accessed August 2, 2025

Contextual Support Journal

(PDF) Influence of environmental conditions and some soil chemical properties on the carbon and nitrogen contents of some tropical Australian rainforest soils - ResearchGate

Preview of Influence of nitrogen fertilization on abundance and diversity of plants and animals in temperate and boreal forests - Canadian Science Publishing, accessed July 19, 2025,

Influence of nitrogen fertilization on abundance and diversity of plants and animals in temperate and boreal forests - Canadian Science Publishing, accessed July 19, 2025,

Contextual Support GreyLiterature

Influence of nitrogen fertilization on abundance and diversity of plants and animals in temperate and boreal forests - Canadian Science Publishing, accessed July 19, 2025,

Preview of Natural levels of nitrogen in tropical forests may increase vulnerability to pollution, accessed July 19, 2025,

Natural levels of nitrogen in tropical forests may increase vulnerability to pollution, accessed July 19, 2025,

Contextual Support Journal

Natural levels of nitrogen in tropical forests may increase vulnerability to pollution, accessed July 19, 2025,

Preview of Nitrogen may limit natural climate solutions - EurekAlert!, accessed July 19, 2025,

Nitrogen may limit natural climate solutions - EurekAlert!, accessed July 19, 2025,

Contextual Support

Nitrogen may limit natural climate solutions - EurekAlert!, accessed July 19, 2025,

Preview of Nitrogen pollution linked to shift in plant distribution - The University of Western Australia, accessed July 19, 2025,

Nitrogen pollution linked to shift in plant distribution - The University of Western Australia, accessed July 19, 2025,

Contextual Support Journal

Nitrogen pollution linked to shift in plant distribution - The University of Western Australia, accessed July 19, 2025,

Preview of Nutrient distribution and cycling in a subtropical ... - CSIRO Publishing, accessed July 16, 2025,

Nutrient distribution and cycling in a subtropical ... - CSIRO Publishing, accessed July 16, 2025,

Contextual Support Journal

Nutrient distribution and cycling in a subtropical ... - CSIRO Publishing, accessed July 22, 2025

Preview of Practice Guide: Improving Nitrogen Cycling and Efficiency - Soils For Life, accessed July 19, 2025,

Practice Guide: Improving Nitrogen Cycling and Efficiency - Soils For Life, accessed July 19, 2025,

Contextual Support Journal

Practice Guide: Improving Nitrogen Cycling and Efficiency - Soils For Life, accessed July 19, 2025,

Preview of Rainforest - WetlandInfo - Department of the Environment, Tourism, Science and Innovation, accessed July 18, 2025,

Rainforest - WetlandInfo - Department of the Environment, Tourism, Science and Innovation, accessed July 18, 2025,

Contextual Support Government

Rainforest - WetlandInfo - Department of the Environment, Tourism, Science and Innovation

Preview of Soil carbon and nitrogen dynamics in a Vertisol following 50 years of ...

Soil carbon and nitrogen dynamics in a Vertisol following 50 years of ...

Contextual Support Journal

The nitrogen book: Principles of soil nitrogen fertility management in southern Queensland and northern New South Wales farming, accessed August 4, 2025,

Preview of Soil carbon and nutrient pools, microbial properties and gross nitrogen transformations in adjacent natural forest and hoop pine plantations of subtropical Australia

Soil carbon and nutrient pools, microbial properties and gross nitrogen transformations in adjacent natural forest and hoop pine plantations of subtropical Australia

Direct Evidence

Soil carbon and nutrient pools, microbial properties and gross nitrogen transformations in adjacent natural forest and hoop pine plantations of subtropical Australia

Preview of SOIL CHEMICAL PROPERTIES AND FOREST FLOOR NUTRIENTS UNDER REPEATED PRESCRIBED- BURNING IN - Scion, accessed July 19, 2025,

SOIL CHEMICAL PROPERTIES AND FOREST FLOOR NUTRIENTS UNDER REPEATED PRESCRIBED- BURNING IN - Scion, accessed July 19, 2025,

Contextual Support Journal

Long-term Vegetation Changes on Alpine Summits in Response to Global Drivers of Change, accessed March 28, 2026,

Preview of Soil nitrogen dynamics in natural forest ecosystem: a review - Frontiers, accessed July 19, 2025,

Soil nitrogen dynamics in natural forest ecosystem: a review - Frontiers, accessed July 19, 2025,

Contextual Support Journal

Soil nitrogen dynamics in natural forest ecosystem: a review - Frontiers, accessed July 19, 2025,

Preview of Soil Nitrogen Dynamics Under Adjacent Native Forest and ... - NSERL, accessed July 19, 2025,

Soil Nitrogen Dynamics Under Adjacent Native Forest and ... - NSERL, accessed July 19, 2025,

Direct Evidence Journal

Soil Nitrogen Dynamics Under Adjacent Native Forest and Hoop Pine Plantations - NSERL, accessed July 20, 2025,

Preview of Soil Nitrogen Supply | Fact Sheets | soilquality.org.au, accessed July 25, 2025,

Soil Nitrogen Supply | Fact Sheets | soilquality.org.au, accessed July 25, 2025,

Contextual Support Government

Nitrogen Fixation in Acacias - AgEcon Search, accessed July 30, 2025,

Preview of Srivastava, S. C., & Singh, J. S. (1989). Effect of cultivation on microbial biomass C and N of a dry tropical forest soil. Biology and Fertility of Soils, 8(4), 343-348.

Srivastava, S. C., & Singh, J. S. (1989). Effect of cultivation on microbial biomass C and N of a dry tropical forest soil. Biology and Fertility of Soils, 8(4), 343-348.

Contextual Support GreyLiterature

Soil microbial biomass, activity and community composition in adjacent native and plantation forests of subtropical Australia | Request PDF - ResearchGate

Preview of Study suggests natural areas may acquire too little nitrogen to repair climate, accessed July 19, 2025,

Study suggests natural areas may acquire too little nitrogen to repair climate, accessed July 19, 2025,

Contextual Support GreyLiterature

Study suggests natural areas may acquire too little nitrogen to repair climate, accessed July 19, 2025,

Preview of Sustaining forest soil quality and productivity [Chapter 3], accessed August 10, 2025,

Sustaining forest soil quality and productivity [Chapter 3], accessed August 10, 2025,

Contextual Support

INFLUENCE OF SOIL ORGANIC MATTER ON FOREST PRODUCTIVITY* - Scion Research, accessed August 10, 2025

Preview of The detrimental effect of rainforest conversion to rubber plantations on soil dissolved organic carbon and C: N stoichiometry, mediated by altered soil biogeochemistry - PubMed, accessed July 19, 2025,

The detrimental effect of rainforest conversion to rubber plantations on soil dissolved organic carbon and C: N stoichiometry, mediated by altered soil biogeochemistry - PubMed, accessed July 19, 2025,

Contextual Support Journal

The detrimental effect of rainforest conversion to rubber plantations on soil dissolved organic carbon and C: N stoichiometry, mediated by altered soil biogeochemistry - PubMed, accessed July 19, 2025,

Preview of The downside of nitrogen fertilizer - Cary Institute of Ecosystem Studies, accessed July 19, 2025,

The downside of nitrogen fertilizer - Cary Institute of Ecosystem Studies, accessed July 19, 2025,

Contextual Support GreyLiterature

The downside of nitrogen fertilizer - Cary Institute of Ecosystem Studies, accessed July 19, 2025,

Preview of The nitrogen book: Principles of soil nitrogen fertility management in southern Queensland and northern New South Wales farming

The nitrogen book: Principles of soil nitrogen fertility management in southern Queensland and northern New South Wales farming

Contextual Support Journal

Soil condition | NSW State of the Environment, accessed August 4, 2025,

Preview of The nitrogen book: Principles of soil nitrogen fertility management in southern Queensland and northern New South Wales farming, accessed July 19, 2025,

The nitrogen book: Principles of soil nitrogen fertility management in southern Queensland and northern New South Wales farming, accessed July 19, 2025,

Contextual Support GreyLiterature

The nitrogen book: Principles of soil nitrogen fertility management in southern Queensland and northern New South Wales farming, accessed July 19, 2025,

Preview of The simulated N deposition accelerates net N mineralization and nitrification in a tropical forest soil - BG, accessed July 19, 2025,

The simulated N deposition accelerates net N mineralization and nitrification in a tropical forest soil - BG, accessed July 19, 2025,

Contextual Support

The simulated N deposition accelerates net N mineralization and nitrification in a tropical forest soil - BG, accessed July 19, 2025,

Preview of Top 6 Sustainable Forest Management Techniques, accessed July 12, 2025,

Top 6 Sustainable Forest Management Techniques, accessed July 12, 2025,

Contextual Support GreyLiterature

Sustainable native forest management, accessed July 12, 2025

Preview of What you need to know about nitrogen pollution | Pursuit by the University of Melbourne, accessed July 19, 2025,

What you need to know about nitrogen pollution | Pursuit by the University of Melbourne, accessed July 19, 2025,

Contextual Support GreyLiterature

What you need to know about nitrogen pollution | Pursuit by the University of Melbourne, accessed July 19, 2025,

Context

Region Australia
Biome Tropical & Subtropical Rainforests
Land Use Production Forestry
Assessment Pristine Reference
Vegetation Forest
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 1
Effective From 9 Jun 2026

Notes

Represents the point where nitrogen deficiency becomes a significant growth-limiting factor, as identified in second-rotation plantations requiring fertilizer inputs for productivity.

Related Benchmarks

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