Microbial Respiration

AUS-AMR-CON-SMR General Moderate confidence

Benchmark Value

4.1 mg/kg/day
Thresholds: Lower: 4.1, Upper: —
Direction: Higher is desirable ↑
Form: LowerThreshold

Scoring Curve

This curve shows how a field measurement for this indicator would score across all available benchmark forms in this context.

Evidence & Context

A critically low state is characterized by respiration rates below approximately 4.1 mg CO₂-C/kg/day.

Metric Definition:

Basal Microbial Respiration (BMR) as defined above.

Benchmark Definition:

This threshold defines a critically low microbial respiration rate indicating degraded soil function in the Arid Mountain Ranges & Uplands conservation areas, typical of low-resource patches.

Justification:

Respiration rates below this threshold indicate a significantly compromised state typical of low-resource patches and degraded areas.

Sources (1)

Preview of Biochemical properties of highly mineralised and infertile soil modified by acacia and spinifex plants in northwest Queensland, Australia
Biochemical properties of highly mineralised and infertile soil modified by acacia and spinifex plants in northwest Queensland, Australia Journal

Biochemical properties of highly mineralised and infertile soil modified by acacia and spinifex plants in northwest Queensland, Australia - CSIRO Publishing, accessed June 7, 2025,

View Source

Supporting Sources (20)

Additional references from the underlying research that informed this benchmark.

Preview of Aridity thresholds of soil microbial metabolic indices along a 3,200 ..., accessed August 3, 2025
Aridity thresholds of soil microbial metabolic indices along a 3,200 ..., accessed August 3, 2025
Contextual Support Journal

Aridity thresholds of soil microbial metabolic indices along a 3,200 ..., accessed August 3, 2025

View Source
Preview of Australia - Soils, Climate, Erosion | Britannica
Australia - Soils, Climate, Erosion | Britannica
Contextual Support GreyLiterature

SOIL TESTING, accessed August 1, 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 Australian dryland soils are acidic and nutrient‐depleted, and have unique microbial communities compared with other drylands - Arid Ecology Lab, accessed August 3, 2025
Australian dryland soils are acidic and nutrient‐depleted, and have unique microbial communities compared with other drylands - Arid Ecology Lab, accessed August 3, 2025
Contextual Support Government

Beringer, J., et al. 2022. Carbon and water fluxes over a temperate Eucalyptus forest and a tropical wet/dry savanna in Australia. Agricultural and Forest Meteorology 129(3):151-173.

View Source
Preview of Basal and specific microbial respiration in semiarid agricultural soils: Organic amendment and irrigation management effects - Taylor & Francis Online, accessed August 3, 2025
Basal and specific microbial respiration in semiarid agricultural soils: Organic amendment and irrigation management effects - Taylor & Francis Online, accessed August 3, 2025
Contextual Support Journal

(PDF) Seasonal variations in soil characteristics control microbial respiration and carbon use under tree plantations in the Middle Gangetic region - ResearchGate, accessed August 3, 2025

View Source
Preview of Carbon Pool Dynamic and Soil Microbial Respiration Affected by ...
Carbon Pool Dynamic and Soil Microbial Respiration Affected by ...
Contextual Support Journal

Carbon Pool Dynamic and Soil Microbial Respiration Affected by Land Use Alteration: A Case Study in Humid Subtropical Area - MDPI, accessed July 28, 2025,

View Source
Preview of Contribution of microbial activity and vegetation cover to the spatial distribution of soil respiration in mountains - Frontiers, accessed August 28, 2025,
Contribution of microbial activity and vegetation cover to the spatial distribution of soil respiration in mountains - Frontiers, accessed August 28, 2025,
Contextual Support Journal

Contribution of microbial activity and vegetation cover to the spatial distribution of soil respiration in mountains - Frontiers, accessed August 3, 2025

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

Growing-season soil microbial respiration response to long-term no tillage and spring ridge tillage - Semantic Scholar, accessed July 28, 2025

View Source
Preview of Great Western Woodlands Flux Data Release 2022_v2
Great Western Woodlands Flux Data Release 2022_v2
Contextual Support

Great Western Woodlands Flux Data Release 2022_v2 - TERN Data Discovery Portal, accessed August 3, 2025

View Source
Preview of Land | State of the Environment Report 2011
Land | State of the Environment Report 2011
Contextual Support Journal

Australian dryland soils are acidic and nutrient-depleted, and have unique microbial communities compared with other drylands - PMC, accessed August 28, 2025,

View Source
Preview of Microbial community composition and activity in paired irrigated and non-irrigated pastures in New Zealand - CSIRO Publishing, accessed August 3, 2025
Microbial community composition and activity in paired irrigated and non-irrigated pastures in New Zealand - CSIRO Publishing, accessed August 3, 2025
Contextual Support Journal

Microbial community composition and activity in paired irrigated and non-irrigated pastures in New Zealand - CSIRO Publishing, accessed August 9, 2025,

View Source
Preview of National Soil Monitoring Program - CSIRO, accessed August 4, 2025,
National Soil Monitoring Program - CSIRO, accessed August 4, 2025,
Contextual Support GreyLiterature

National Soil Monitoring Program - CSIRO

View Source
Preview of Productivity and Seasonality Drive Total Soil Respiration in Semi-Arid Juniper Woodlands (Juniperus thurifera L., Southern Spain) - MDPI, accessed August 3, 2025
Productivity and Seasonality Drive Total Soil Respiration in Semi-Arid Juniper Woodlands (Juniperus thurifera L., Southern Spain) - MDPI, accessed August 3, 2025
Contextual Support Journal

Productivity and Seasonality Drive Total Soil Respiration in Semi-Arid Juniper Woodlands (Juniperus thurifera L., Southern Spain) - MDPI, accessed August 3, 2025

View Source
Preview of Soil  the driver of carbon dioxide variability over Australia | TERN Australia, accessed August 28, 2025,
Soil  the driver of carbon dioxide variability over Australia | TERN Australia, accessed August 28, 2025,
Contextual Support Government

Soil respiration–driven CO2 pulses dominate Australia's flux variability, accessed August 3, 2025

View Source
Preview of Soil Constraints in an Arid Environment—Challenges, Prospects, and Implications - MDPI, accessed July 6, 2025,
Soil Constraints in an Arid Environment—Challenges, Prospects, and Implications - MDPI, accessed July 6, 2025,
Contextual Support Journal

Soil pH | Environment, land and water - Queensland Government, accessed July 28, 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 Journal

Soil Microbial Activity in Conventional and Organic Agricultural ..., accessed July 28, 2025

View Source
Preview of Soil Research - CSIRO PUBLISHING, accessed August 5, 2025,
Soil Research - CSIRO PUBLISHING, accessed August 5, 2025,
Contextual Support Journal

Soil Research - CSIRO PUBLISHING

View Source
Preview of Summary of the collections of arid soils from Australia. - ResearchGate
Summary of the collections of arid soils from Australia. - ResearchGate
Contextual Support GreyLiterature

Rehabilitation of Semiarid Landscapes in Australia. I. Restoring Productive Soil Patches | Request PDF - ResearchGate, accessed August 3, 2025

View Source
Preview of The Biogeography of Soil Bacteria in Australia Exhibits Greater Resistance to Climate Change Than Fungi - PubMed Central, accessed July 28, 2025
The Biogeography of Soil Bacteria in Australia Exhibits Greater Resistance to Climate Change Than Fungi - PubMed Central, accessed July 28, 2025
Contextual Support Journal

Responses of Soil Fungal Communities to Lime Application in Wheat Fields in the Pacific Northwest - Frontiers, accessed July 23, 2025,

View Source
Preview of Twenty years of progress, challenges, and opportunities in measuring and understanding soil respiration - Forest Service, accessed August 3, 2025
Twenty years of progress, challenges, and opportunities in measuring and understanding soil respiration - Forest Service, accessed August 3, 2025
Contextual Support

Soil respiration and ecosystem carbon flux in semi-arid woodlands: effect of season, precipitation and wildfire - Adelaide Research & Scholarship, accessed August 3, 2025

View Source

Context

  • Region Australia
  • Biome Arid Mountain Ranges & Uplands
  • Land Use Conservation / Protected Natural Areas
  • Assessment Conservation Target
  • Evidence Type DegradationThreshold

Lifecycle

  • Status Active
  • Version 1
  • Effective From 20 Mar 2026

Notes

This threshold aligns with environmental conditions where microbial metabolism shifts due to extreme water and substrate stress.

Related Benchmarks

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

8.2 mg/kg/day Moderate
Conservation / Protected Natural Areas ยท Conservation Target
Point Active v1