Microbial Respiration

AUS-AIF-AGR-SMR General Low confidence

Benchmark Value

12 mg CO2/kg/day
Direction: Lower 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.

Evidence & Context

The conventional continuous cotton system in the foundational CSIRO study, representing a degraded state, exhibited respiration rates of approximately 0.5 to 1.0 ³bcg CO2 -C/g/hr.8 This equates to a range of 12 to 24 mg CO2 -C/kg/day. A respiration rate falling within or below this range, particularly in a soil with adequate moisture and temperature, would be a strong indication of a critically impaired system suffering from one or more of the limiting factors described above.

Metric Definition:

Microbial respiration rate indicating critically low function due to severe carbon depletion or adverse soil conditions.

Benchmark Definition:

A lower critical threshold for microbial respiration indicating biological impairment in soils under agricultural cropping in Australia's Arid Inland Floodplains.

Justification:

Inferred from degraded continuous cotton system respiration rates in the CSIRO study, indicating suppressed nutrient cycling and microbial activity.

Sources (1)

Preview of Effect of strategic tillage in soil microbial communities in Vertisols from Queensland, Australia - UQ eSpace, accessed July 17, 2025
Effect of strategic tillage in soil microbial communities in Vertisols from Queensland, Australia - UQ eSpace, accessed July 17, 2025 Journal

Effect of strategic tillage in soil microbial communities in Vertisols from Queensland, Australia - UQ eSpace, accessed July 21, 2025

View Source

Supporting Sources (27)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Of macropores and tillage: influence of biomass incorporation on cover crop decomposition and soil respiration - ResearchGate, accessed July 17, 2025
(PDF) Of macropores and tillage: influence of biomass incorporation on cover crop decomposition and soil respiration - ResearchGate, accessed July 17, 2025
Contextual Support Journal

(PDF) Of macropores and tillage: influence of biomass incorporation on cover crop decomposition and soil respiration - ResearchGate, accessed July 17, 2025

View Source
Preview of A review of the economics of regenerative agriculture in Western Australia - DPIRD's Digital library, accessed August 4, 2025
A review of the economics of regenerative agriculture in Western Australia - DPIRD's Digital library, accessed August 4, 2025
Contextual Support Journal

A review of the economics of regenerative agriculture in Western Australia - DPIRD's Digital library

View Source
Preview of Australian soil microbiome: A first sightseeing regional prediction driven by cycles of soil temperature and pedogenic variations - PubMed, accessed July 17, 2025
Australian soil microbiome: A first sightseeing regional prediction driven by cycles of soil temperature and pedogenic variations - PubMed, accessed July 17, 2025
Contextual Support Journal

Soil compaction and controlled traffic considerations in Australian cotton-farming systems, accessed July 17, 2025

View Source
Preview of Boom and bust for biodiversity in arid Australia, accessed July 17, 2025
Boom and bust for biodiversity in arid Australia, accessed July 17, 2025
Contextual Support Journal

Boom and bust for biodiversity in arid Australia, accessed July 17, 2025

View Source
Preview of Boom and bust for biodiversity in arid Australia, accessed July 21, 2025,
Boom and bust for biodiversity in arid Australia, accessed July 21, 2025,
Contextual Support GreyLiterature

Managing biodiversity in arid Australia: a landscape view | Animals of Arid AustraliaOut on their own? | Australian Zoologist - Allen Press, accessed July 27, 2025

View Source
Preview of Changes in soil carbon in response to flooding of the floodplain of a ..., accessed July 17, 2025
Changes in soil carbon in response to flooding of the floodplain of a ..., accessed July 17, 2025
Contextual Support Government

Floods - Bushland and agriculture - CSIRO

View Source
Preview of Contrasting Soil pH Effects on Fungal and Bacterial Growth Suggest Functional Redundancy in Carbon Mineralization | Applied and Environmental Microbiology - ASM Journals, accessed July 28, 2025
Contrasting Soil pH Effects on Fungal and Bacterial Growth Suggest Functional Redundancy in Carbon Mineralization | Applied and Environmental Microbiology - ASM Journals, accessed July 28, 2025
Contextual Support

Contrasting Soil pH Effects on Fungal and Bacterial Growth Suggest Functional Redundancy in Carbon Mineralization | Applied and Environmental Microbiology - ASM Journals, accessed July 23, 2025

View Source
Preview of Crop Rotation in Australia: Boost Yields & Soil Health - KG2, accessed July 17, 2025
Crop Rotation in Australia: Boost Yields & Soil Health - KG2, accessed July 17, 2025
Contextual Support Journal

Crop Rotation in Australia: Boost Yields & Soil Health - KG2, accessed July 17, 2025

View Source
Preview of Distribution of subsoil microbial activity and biomass under Australian rotational cotton as influenced by system, crop status and season | Request PDF - ResearchGate, accessed July 17, 2025
Distribution of subsoil microbial activity and biomass under Australian rotational cotton as influenced by system, crop status and season | Request PDF - ResearchGate, accessed July 17, 2025
Direct Evidence Journal

Distribution of subsoil microbial activity and biomass under Australian rotational cotton as influenced by system, crop status and season | Request PDF - ResearchGate, accessed July 17, 2025

View Source
Preview of Inherent Factors Affecting Soil Respiration - Solvita, accessed August 5, 2025,
Inherent Factors Affecting Soil Respiration - Solvita, accessed August 5, 2025,
Contextual Support Journal

Inherent Factors Affecting Soil Respiration - Solvita

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 Management options to improve soil biological functions in cotton farming systems
Management options to improve soil biological functions in cotton farming systems
Direct Evidence Journal

Management options to improve soil biological functions in cotton farming systems

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

Unraveling the Importance of Forest Structure and Composition Driving Soil Microbial and Enzymatic Responses in the Subtropical Forest Soils - MDPI

View Source
Preview of Monitoring the behaviour of Australian Vertosols in response to the shrink–swell characteristic and cotton picker traffic - CSIRO PUBLISHING | Soil Research, accessed August 4, 2025,
Monitoring the behaviour of Australian Vertosols in response to the shrink–swell characteristic and cotton picker traffic - CSIRO PUBLISHING | Soil Research, accessed August 4, 2025,
Contextual Support Journal

Monitoring the behaviour of Australian Vertosols in response to the shrink–swell characteristic and cotton picker traffic - CSIRO PUBLISHING | Soil Research, accessed July 17, 2025

View Source
Preview of Murraylands and Riverland | Soil carbon - Landscape South Australia, accessed July 17, 2025
Murraylands and Riverland | Soil carbon - Landscape South Australia, accessed July 17, 2025
Contextual Support Government

Scoping Paper: Soil Organic Carbon Sequestration Potential for Agriculture in NSW, accessed August 11, 2025

View Source
Preview of National Guidance on Acid Sulfate Soils - Water Quality Australia
National Guidance on Acid Sulfate Soils - Water Quality Australia
Contextual Support Journal

Managing soils - Department of Primary Industries and Regional Development, accessed July 17, 2025

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

Regenerative agriculture is key to dry season preparation - Soils For Life, accessed July 23, 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 July 20, 2025,

View Source
Preview of Regenerative opportunities for building soil biological resilience – a ..., accessed May 11, 2025
Regenerative opportunities for building soil biological resilience – a ..., accessed May 11, 2025
Contextual Support GreyLiterature

Regenerative opportunities for building soil biological resilience – a case study in the low-rainfall zone in Southern Australia - GRDC

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 Salinity Management in the Murray–Darling Basin, Australia - MDPI, accessed July 16, 2025,
Salinity Management in the Murray–Darling Basin, Australia - MDPI, accessed July 16, 2025,
Contextual Support Journal

Salinity Management in the Murray2Darling Basin, Australia - MDPI, accessed July 28, 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 GreyLiterature

Coexistence of shrubs and grass in a semi-arid landscape: a case study of mulga (Acacia aneura, Mimosaceae) shrublands embedded in fire-prone spinifex (Triodia pungens, Poaceae) hummock grasslands - CSIRO PUBLISHING | Australian Journal of Botany

View Source
Preview of Soil Health and Regenerative Agriculture - Southern Queensland Landscapes, accessed July 17, 2025
Soil Health and Regenerative Agriculture - Southern Queensland Landscapes, accessed July 17, 2025
Contextual Support GreyLiterature

Soil Health and Regenerative Agriculture - Southern Queensland Landscapes, accessed July 17, 2025

View Source
Preview of Soil Moisture Affects the Rapid Response of Microbes to Labile Organic C Addition, accessed July 30, 2025,
Soil Moisture Affects the Rapid Response of Microbes to Labile Organic C Addition, accessed July 30, 2025,
Contextual Support Journal

Soil respiration–driven CO2 pulses dominate Australia's flux variability

View Source
Preview of Soil Respiration - Natural Resources Conservation Service, accessed July 30, 2025,
Soil Respiration - Natural Resources Conservation Service, accessed July 30, 2025,
Contextual Support Journal

Temperate Grasslands - Greening Australia, accessed August 12, 2025,

View Source
Preview of Soil Salinity Mapping and Monitoring in Arid and Semi-Arid Regions Using Remote Sensing Technology: A Review - ResearchGate, accessed July 17, 2025
Soil Salinity Mapping and Monitoring in Arid and Semi-Arid Regions Using Remote Sensing Technology: A Review - ResearchGate, accessed July 17, 2025
Contextual Support

Soil Salinity Mapping and Monitoring in Arid and Semi-Arid Regions Using Remote Sensing Technology: A Review - ResearchGate, accessed July 17, 2025

View Source
Preview of SoilQuality.org.au. (n.d.). Soil Acidity Factsheet.
SoilQuality.org.au. (n.d.). Soil Acidity Factsheet.
Contextual Support

Soil Acidity | Fact Sheets | soilquality.org.au, accessed July 20, 2025,

View Source

Context

  • Region Australia
  • Biome Arid Inland Floodplains & Ephemeral River Systems
  • Land Use Agricultural Crop Production
  • Assessment Not Stated
  • Evidence Type DegradationThreshold

Lifecycle

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

Notes

Respiration rates at or below this threshold indicate a biologically impaired soil with compromised ecosystem functions due to carbon depletion, extreme pH, compaction, or drought. No upper detrimental threshold — higher values are always better up to natural saturation. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

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

156 mg CO2/kg/day Low
Agricultural Crop Production ยท Not Stated
Point Active v1