Microbial Respiration

AUS-TDG-AGR-SMR General Moderate confidence

Benchmark Value

12.4 mg/kg/day
Thresholds: Lower: —, Upper: 12.4
Direction: Higher is desirable ↑
Form: UpperThreshold

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 7 benchmarks together — the OptimalRange form drives the primary score, while 6 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary Point Guard Point Guard LowerThreshold Guard UpperThreshold Guard UpperThreshold Guard Point Guard

Evidence & Context

The high respiration rate observed in the 50-year no-till, stubble-burnt system (~12.4 mg CO₂-C/kg/day) serves as a compelling example of such a detrimental rate, as it signifies a system that is rapidly losing carbon in an inefficient manner.

Metric Definition:

Microbial respiration rate representing an upper detrimental threshold beyond which the system is inefficient and losing soil carbon.

Benchmark Definition:

This benchmark represents an upper detrimental microbial respiration rate threshold, beyond which soil carbon loss and system inefficiency occur in temperate dry woodlands and native grasslands under agricultural crop production.

Justification:

This threshold is based on observed respiration rates in stressed, inefficient systems characterized by rapid carbon loss.

Sources (1)

Preview of How to determine an OPTIMAL soil respiration (or microbial respiration)? - ResearchGate, accessed August 5, 2025,
How to determine an OPTIMAL soil respiration (or microbial respiration)? - ResearchGate, accessed August 5, 2025, GreyLiterature

Soil Health Testing - Agronomic Insights, accessed August 13, 2025,

View Source

Supporting Sources (16)

Additional references from the underlying research that informed this benchmark.

Preview of Comparison of temperature effects on soil respiration and bacterial and fungal growth rates | FEMS Microbiology Ecology | Oxford Academic, accessed July 30, 2025,
Comparison of temperature effects on soil respiration and bacterial and fungal growth rates | FEMS Microbiology Ecology | Oxford Academic, accessed July 30, 2025,
Contextual Support Journal

Quantifying thermal adaptation of soil microbial respiration - PMC - PubMed Central, accessed August 13, 2025,

View Source
Preview of Haney Test Interpretation Guide v1.0, accessed August 9, 2025
Haney Test Interpretation Guide v1.0, accessed August 9, 2025
Contextual Support

Sustainable Land Use Enhances Soil Microbial Respiration Responses to Experimental Heat Stress - PMC - PubMed Central, accessed August 13, 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

Twenty years of progress, challenges, and opportunities in measuring and understanding soil respiration, accessed August 13, 2025,

View Source
Preview of Is there any harmful effect of agrochemicals use on soil microorganisms? - ResearchGate
Is there any harmful effect of agrochemicals use on soil microorganisms? - ResearchGate
Contextual Support GreyLiterature

Starting / Enhancing Your Regenerative Agriculture Journey, accessed August 13, 2025,

View Source
Preview of Microbiological Indicators for Assessing the Effects of Agricultural Practices on Soil Health: A Review - MDPI, accessed on June 5, 2025
Microbiological Indicators for Assessing the Effects of Agricultural Practices on Soil Health: A Review - MDPI, accessed on June 5, 2025
Contextual Support Journal

Microbiological Indicators for Assessing the Effects of Agricultural Practices on Soil Health: A Review - MDPI, accessed August 13, 2025,

View Source
Preview of Regenerative Agriculture - a literature review on the practices and mechanisms used to improve soil health - DPIRD's Digital library, accessed August 5, 2025,
Regenerative Agriculture - a literature review on the practices and mechanisms used to improve soil health - DPIRD's Digital library, accessed August 5, 2025,
Contextual Support

Regenerative Land Management - HEALTHY SOILS AUSTRALIA

View Source
Preview of Regenerative agriculture in Australia: the changing face of farming - Frontiers, accessed August 4, 2025
Regenerative agriculture in Australia: the changing face of farming - Frontiers, accessed August 4, 2025
Contextual Support Journal

NCC: Regenerative Agriculture and Soil Health - Wet Tropics Plan, accessed July 27, 2025,

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 August 28, 2025,

View Source
Preview of Soil carbon - Department for Environment and Water, accessed August 5, 2025,
Soil carbon - Department for Environment and Water, accessed August 5, 2025,
Contextual Support Journal

Soil carbon - Department for Environment and Water, accessed August 13, 2025,

View Source
Preview of Soil Carbon Sequestration Potential: A review for Australian agriculture - MLA, accessed August 5, 2025,
Soil Carbon Sequestration Potential: A review for Australian agriculture - MLA, accessed August 5, 2025,
Contextual Support Journal

Spatial distribution of soil microbial activity and soil properties ..., accessed August 13, 2025,

View Source
Preview of Soil organic carbon thresholds control fertilizer effects on carbon accrual in croplands worldwide - PMC, accessed August 13, 2025,
Soil organic carbon thresholds control fertilizer effects on carbon accrual in croplands worldwide - PMC, accessed August 13, 2025,
Contextual Support Journal

Soil organic carbon thresholds control fertilizer effects on carbon accrual in croplands worldwide - PMC, accessed August 13, 2025,

View Source
Preview of Soil respiration - Wikipedia, accessed July 30, 2025,
Soil respiration - Wikipedia, accessed July 30, 2025,
Contextual Support

Soil respiration - Wikipedia, accessed August 13, 2025,

View Source
Preview of Soil Respiration in Semiarid Temperate Grasslands under Various Land Management | PLOS One - Research journals, accessed August 12, 2025,
Soil Respiration in Semiarid Temperate Grasslands under Various Land Management | PLOS One - Research journals, accessed August 12, 2025,
Contextual Support Journal

Threshold Limits of Soil in Relation to Various Soil Functions and Crop Productivity, accessed August 13, 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, accessed August 13, 2025,

View Source
Preview of Temperature sensitivity of soil respiration rates enhanced by microbial community response - PubMed, accessed July 30, 2025,
Temperature sensitivity of soil respiration rates enhanced by microbial community response - PubMed, accessed July 30, 2025,
Contextual Support Journal

Temperature sensitivity of soil respiration rates enhanced by microbial community response - PubMed, accessed August 13, 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

Growing-season soil microbial respiration response to long-term no ..., accessed August 13, 2025,

View Source

Context

  • Region Australia
  • Biome Temperate Dry Woodlands & Native Grasslands
  • Land Use Agricultural Crop Production
  • Assessment Pristine Reference
  • Evidence Type DegradationThreshold

Lifecycle

  • Status Active
  • Version 2
  • Effective From 24 Mar 2026

Notes

This upper threshold is not a single number but a functional state; however, rates exceeding ~12 mg CO₂-C/kg/day are indicative of system stress and carbon loss.

Related Benchmarks

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

5.8 mg/kg/day Moderate
Agricultural Crop Production · Pristine Reference
Point Active v3
5.8 mg/kg/day Moderate
Agricultural Crop Production · Pristine Reference
Point Superseded v2
5.8 mg/kg/day Moderate
Agricultural Crop Production · Pristine Reference
Point Superseded v1
12.4 mg/kg/day Moderate
Agricultural Crop Production · Pristine Reference
UpperThreshold Superseded v1