Fungal:Bacterial Ratio

AUS-TSW-FOR-SFB General Moderate confidence

Benchmark Value

5 index
Range: 3 to 10 index
Thresholds: Lower: 1, Upper: —
Optimal Range: 3 to 10
Direction: Higher 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 5 benchmarks together — the OptimalRange form drives the primary score, while 4 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary Point Guard OptimalRange Guard OptimalRange Guard LowerThreshold Guard

Evidence & Context

A benchmark of 5.0 is proposed based on a weight-of-evidence synthesis, as no direct measurement exists for this specific context.

Metric Definition:

The ratio of fungal to bacterial biomass (F:B ratio) in soil

Benchmark Definition:

The ratio of fungal to bacterial biomass in soil indicates the dominant pathways of energy and nutrient flow, reflecting ecosystem health in Australian temperate semi-arid production forestry.

Justification:

This value is derived by triangulating data from analogous temperate forests (median ~3.9), conceptual ranges for healthy forests (5:1 to 10:1), and the known ecological drivers of Australian semi-arid eucalypt woodlands which favor fungi.

Sources (1)

Preview of Mechanisms and implications of bacterial–fungal competition for soil resources - PMC, accessed July 18, 2025
Mechanisms and implications of bacterial–fungal competition for soil resources - PMC, accessed July 18, 2025 Journal

Soil Fungal:Bacterial Ratios Are Linked to Altered Carbon Cycling - Frontiers, accessed July 23, 2025

View Source

Supporting Sources (15)

Additional references from the underlying research that informed this benchmark.

Preview of Analyzing your Fungal to Bacterial Ratio Results - MicroBiometer, accessed July 18, 2025
Analyzing your Fungal to Bacterial Ratio Results - MicroBiometer, accessed July 18, 2025
Contextual Support GreyLiterature

Analyzing your Fungal to Bacterial Ratio Results - microBIOMETER, accessed June 7, 2025,

View Source
Preview of Australian dryland soils are acidic and nutrient-depleted, and have unique microbial communities compared with other drylands - PMC, accessed August 5, 2025,
Australian dryland soils are acidic and nutrient-depleted, and have unique microbial communities compared with other drylands - PMC, accessed August 5, 2025,
Contextual Support Journal

Root Structure and Functioning for Efficient Acquisition of Phosphorus: Matching Morphological and Physiological Traits

View Source
Preview of ausveg - fact sheet: soil microbiology, accessed July 18, 2025
ausveg - fact sheet: soil microbiology, accessed July 18, 2025
Contextual Support Journal

ausveg - fact sheet: soil microbiology

View Source
Preview of Contrasting successional responses of soil bacteria and fungi to post-logging burn severity | Request PDF - ResearchGate, accessed July 12, 2025,
Contrasting successional responses of soil bacteria and fungi to post-logging burn severity | Request PDF - ResearchGate, accessed July 12, 2025,
Contextual Support Journal

NMDS plots of the composition of soil and litter fungal and bacterial... - ResearchGate, accessed July 12, 2025,

View Source
Preview of EFFECTS OF AGRICULTURAL MANAGEMENT ON SOIL CARBON ..., accessed on June 7, 2025
EFFECTS OF AGRICULTURAL MANAGEMENT ON SOIL CARBON ..., accessed on June 7, 2025
Contextual Support Journal

Fire regime impacts on soil microbes, soil organic carbon and ground cover in an Australian tropical savanna - CSIRO PUBLISHING | International Journal of Wildland Fire, accessed on June 7, 2025

View Source
Preview of Effects of Forest Types and Environmental Factors on Soil Microbial Biomass in a Coastal Sand Dune of Subtropical China - Journal of Resources and Ecology
Effects of Forest Types and Environmental Factors on Soil Microbial Biomass in a Coastal Sand Dune of Subtropical China - Journal of Resources and Ecology
Contextual Support Journal

Fungi to bacteria ratio: Historical misinterpretations and potential implications | Request PDF, accessed July 12, 2025,

View Source
Preview of Fungal/bacterial ratios in grasslands with contrasting nitrogen management - ResearchGate, accessed July 12, 2025,
Fungal/bacterial ratios in grasslands with contrasting nitrogen management - ResearchGate, accessed July 12, 2025,
Contextual Support Journal

Fungal/bacterial ratios in grasslands with contrasting nitrogen management - ResearchGate, accessed July 12, 2025,

View Source
Preview of Fungal/bacterial ratios in grasslands with contrasting nitrogen management, accessed July 19, 2025,
Fungal/bacterial ratios in grasslands with contrasting nitrogen management, accessed July 19, 2025,
Contextual Support Journal

Soil Fungal:Bacterial Ratios Are Linked to Altered Carbon Cycling - Frontiers, accessed July 30, 2025,

View Source
Preview of Fungi to bacteria ratio: Historical misinterpretations and potential implications | Request PDF, accessed July 18, 2025
Fungi to bacteria ratio: Historical misinterpretations and potential implications | Request PDF, accessed July 18, 2025
Contextual Support Journal

Soil Fungal:Bacterial Ratios Are Linked to Altered Carbon Cycling - Frontiers, accessed August 1, 2025

View Source
Preview of Soil Fungal:Bacterial Ratios Are Linked to Altered Carbon ... - Frontiers, accessed July 18, 2025
Soil Fungal:Bacterial Ratios Are Linked to Altered Carbon ... - Frontiers, accessed July 18, 2025
Contextual Support Journal

The biogeography of relative abundance of soil fungi versus bacteria in surface topsoil, accessed August 1, 2025

View Source
Preview of Tagged with ratio of fungi to bacteria - The Prairie Ecologist, accessed July 12, 2025,
Tagged with ratio of fungi to bacteria - The Prairie Ecologist, accessed July 12, 2025,
Contextual Support Journal

Tagged with ratio of fungi to bacteria - The Prairie Ecologist, accessed July 12, 2025,

View Source
Preview of Tagged with ratio of fungi to bacteria - The Prairie Ecologist, accessed July 28, 2025
Tagged with ratio of fungi to bacteria - The Prairie Ecologist, accessed July 28, 2025
Contextual Support GreyLiterature

Analyzing your Fungal to Bacterial Ratio Results - microBIOMETER, accessed July 21, 2025

View Source
Preview of The biogeography of relative abundance of soil fungi versus bacteria in surface topsoil, accessed on June 5, 2025
The biogeography of relative abundance of soil fungi versus bacteria in surface topsoil, accessed on June 5, 2025
Contextual Support Journal

Fungal to Bacterial Ratios: What and Why? - Ward Laboratories, Inc., accessed July 30, 2025,

View Source
Preview of The fungal-bacterial ratio for soil health - Farmer's Weekly, accessed July 12, 2025,
The fungal-bacterial ratio for soil health - Farmer's Weekly, accessed July 12, 2025,
Contextual Support Journal

(PDF) Soil Microbial Community Successional Patterns during ..., accessed July 20, 2025,

View Source
Preview of The fungal-bacterial ratio for soil health - Farmer's Weekly, accessed July 28, 2025
The fungal-bacterial ratio for soil health - Farmer's Weekly, accessed July 28, 2025
Contextual Support GreyLiterature

Mechanisms and implications of bacterial–fungal competition for soil resources - PMC, accessed July 30, 2025,

View Source

Context

  • Region Australia
  • Biome Temperate Semi-Arid Shrublands & Open Woodlands
  • Land Use Production Forestry
  • Assessment Pristine Reference
  • Evidence Type TargetCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 24 Mar 2026

Notes

Lower Critical Threshold: 1 index. Optimal Range: 3 to 10 index. No upper detrimental threshold — higher values are always better up to natural saturation.