Microbial Respiration

AUS-AMR-AGR-SMR General Moderate confidence

Benchmark Value

5 mg/kg/day
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 6 benchmarks together — the OptimalRange form drives the primary score, while 5 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary Point Guard Point Guard MinimumOnly Guard MaximumOnly Guard Point Guard

Evidence & Context

Based on these observations, a microbial respiration rate of < 5 mgCO2​−C/kg/day can be proposed as a reasonable lower critical threshold.

Metric Definition:

Microbial respiration rate measured as mg CO2-C per kg of soil per day, indicating soil microbial metabolic activity.

Benchmark Definition:

Microbial respiration below 5 mg/kg/day indicates severe biological degradation and impaired soil ecosystem function in agricultural cropping systems.

Justification:

Inferred from data on degraded and low-activity systems showing functionally compromised soil at respiration rates below 5 mgCO2−C/kg/day.

Sources (1)

Preview of Soil quality of a Red Latosol under different management and fertilizer systems
Soil quality of a Red Latosol under different management and fertilizer systems Journal

Paired-site comparison showed higher microbial respiration and biomass in native Eucalyptus and Acacia woodland.

View Source

Supporting Sources (20)

Additional references from the underlying research that informed this benchmark.

Preview of A review on effective soil health bio-indicators for ecosystem restoration and sustainability, accessed August 5, 2025,
A review on effective soil health bio-indicators for ecosystem restoration and sustainability, accessed August 5, 2025,
Contextual Support Journal

Microorganisms as Indicators of Soil Health, accessed August 10, 2025

View Source
Preview of basal soil respiration: Topics by Science.gov, accessed on June 5, 2025
basal soil respiration: Topics by Science.gov, accessed on June 5, 2025
Contextual Support GreyLiterature

basal soil respiration: Topics by Science.gov

View Source
Preview of CSIRO and UQ collaborate to boost Australia's ecosystem research, accessed July 25, 2025,
CSIRO and UQ collaborate to boost Australia's ecosystem research, accessed July 25, 2025,
Contextual Support Government

CSIRO and UQ collaborate to boost Australia's ecosystem research

View Source
Preview of Final Technical Report - Quantifying the effectiveness of cover crops to increase water infiltration and reduce evaporation in the northern region, accessed July 9, 2025
Final Technical Report - Quantifying the effectiveness of cover crops to increase water infiltration and reduce evaporation in the northern region, accessed July 9, 2025
Contextual Support Journal

Fire and land use impact soil properties in a Mediterranean dry sclerophyll woodland

View Source
Preview of Groundwater Discharge - of the Western Great Artesian Basin - Department for Environment and Water, accessed July 28, 2025
Groundwater Discharge - of the Western Great Artesian Basin - Department for Environment and Water, accessed July 28, 2025
Contextual Support Journal

Groundwater Discharge - of the Western Great Artesian Basin - Department for Environment and Water, accessed July 28, 2025

View Source
Preview of Inherent Factors Affecting Soil Respiration - USDA, accessed July 30, 2025,
Inherent Factors Affecting Soil Respiration - USDA, accessed July 30, 2025,
Contextual Support Journal

Inherent Factors Affecting Soil Respiration - USDA

View Source
Preview of Living soils in agriculture | TERN Australia, accessed July 25, 2025,
Living soils in agriculture | TERN Australia, accessed July 25, 2025,
Contextual Support Government

Living soils in agriculture | TERN Australia, accessed July 16, 2025,

View Source
Preview of Long Term Effects of Tillage–Crop Rotation Interaction on Soil Organic Carbon Pools and Microbial Activity on Wheat-Based System in Mediterranean Semi-Arid Region - MDPI, accessed July 28, 2025
Long Term Effects of Tillage–Crop Rotation Interaction on Soil Organic Carbon Pools and Microbial Activity on Wheat-Based System in Mediterranean Semi-Arid Region - MDPI, accessed July 28, 2025
Contextual Support Journal

Long Term Effects of Tillage–Crop Rotation Interaction on Soil Organic Carbon Pools and Microbial Activity on Wheat-Based System in Mediterranean Semi-Arid Region - MDPI, accessed July 28, 2025

View Source
Preview of pilbara craton australia: Topics by Science.gov, accessed July 28, 2025
pilbara craton australia: Topics by Science.gov, accessed July 28, 2025
Contextual Support GreyLiterature

Soil respiration rate and its sensitivity to temperature in pasture ...

View Source
Preview of Recommended Measurements for Scaling Soil Health Assessment, accessed July 28, 2025
Recommended Measurements for Scaling Soil Health Assessment, accessed July 28, 2025
Methodology Source GreyLiterature

A review on effective soil health bio-indicators for ecosystem restoration and sustainability

View Source
Preview of Regenerative Agriculture—A Literature Review on the Practices and Mechanisms Used to Improve Soil Health - MDPI, accessed August 5, 2025,
Regenerative Agriculture—A Literature Review on the Practices and Mechanisms Used to Improve Soil Health - MDPI, accessed August 5, 2025,
Contextual Support Journal

Regenerative Agriculture—A Literature Review on the Practices and Mechanisms Used to Improve Soil Health - MDPI, accessed July 20, 2025,

View Source
Preview of Responses of the soil microbial community to nitrogen fertilizer regimes and historical exposure to extreme weather events: Flooding or prolonged-drought - CSIRO Research Publications Repository, accessed July 17, 2025
Responses of the soil microbial community to nitrogen fertilizer regimes and historical exposure to extreme weather events: Flooding or prolonged-drought - CSIRO Research Publications Repository, accessed July 17, 2025
Contextual Support Journal

Conservation tillage practices affect soil microbial diversity and composition in experimental fields - PubMed Central, accessed July 28, 2025

View Source
Preview of Role of soil drying in nitrogen mineralization and microbial community function in semi-arid grasslands of North-West Australia | Request PDF - ResearchGate
Role of soil drying in nitrogen mineralization and microbial community function in semi-arid grasslands of North-West Australia | Request PDF - ResearchGate
Contextual Support

Microbial impact on initial soil formation in arid and semiarid environments under simulated climate change - Frontiers, accessed July 28, 2025

View Source
Preview of Soil – the driver of carbon dioxide variability over Australia, accessed July 28, 2025
Soil – the driver of carbon dioxide variability over Australia, accessed July 28, 2025
Contextual Support GreyLiterature

Bulk density of soil at the woodland and plantation in March 2008 at Castlereagh, Australia - ResearchGate, accessed July 30, 2025

View Source
Preview of Soil Microbial Activity in Conventional and Organic Agricultural ..., accessed July 28, 2025
Soil Microbial Activity in Conventional and Organic Agricultural ..., accessed July 28, 2025
Contextual Support GreyLiterature

Soil respiration dynamics in fire affected semi-arid ecosystems: Effects of vegetation type and environmental factors | Request PDF - ResearchGate

View Source
Preview of Soil microbial respiration adapts to ambient temperature in global drylands - PMC, accessed August 5, 2025,
Soil microbial respiration adapts to ambient temperature in global drylands - PMC, accessed August 5, 2025,
Contextual Support

Soil – the driver of carbon dioxide variability over Australia

View Source
Preview of Soil microbial respiration adapts to ambient temperature in global drylands - PMC, accessed July 28, 2025
Soil microbial respiration adapts to ambient temperature in global drylands - PMC, accessed July 28, 2025
Contextual Support

Soil microbial respiration adapts to ambient temperature in global drylands - PMC, accessed July 28, 2025

View Source
Preview of Soil respiration rate and its sensitivity to temperature in pasture systems of dry-tropics - Taylor & Francis Online, accessed July 30, 2025,
Soil respiration rate and its sensitivity to temperature in pasture systems of dry-tropics - Taylor & Francis Online, accessed July 30, 2025,
Contextual Support Journal

Soil respiration rate and its sensitivity to temperature in pasture systems of dry-tropics - Taylor & Francis Online

View Source
Preview of Soil respiration–driven CO2 pulses dominate Australia's flux variability, accessed July 28, 2025
Soil respiration–driven CO2 pulses dominate Australia's flux variability, accessed July 28, 2025
Contextual Support Journal

Soil respiration–driven CO2 pulses dominate Australia's flux variability, accessed July 28, 2025

View Source
Preview of Understanding the impacts of farming practices on the soil microbiome as a sustainable approach to crop production. - CSIRO Research, accessed July 9, 2025
Understanding the impacts of farming practices on the soil microbiome as a sustainable approach to crop production. - CSIRO Research, accessed July 9, 2025
Contextual Support Government

COMPARISON OF TWO TILLAGE PRACTICES ON A SEMI-ARID, accessed July 22, 2025

View Source

Context

  • Region Australia
  • Biome Arid Mountain Ranges & Uplands
  • Land Use Agricultural Crop Production
  • Assessment Not Stated
  • Evidence Type DegradationThreshold

Lifecycle

  • Status Active
  • Version 1
  • Effective From 5 Jun 2026

Notes

This threshold marks the point of functional impairment in soil microbial activity requiring intervention. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

Other benchmarks in the AUS-AMR-AGR-SMR family.

— mg/kg/day Low
Agricultural Crop Production · Agricultural Biodiversity Target
OptimalRange Active v1
35 mg/kg/day Moderate
Agricultural Crop Production · Not Stated
MaximumOnly Active v1