Microbial Respiration

AUS-AMR-CON-SMR General Moderate confidence

Benchmark Value

8.2 mg/kg/day

Range: 8.2 to — mg/kg/day

Optimal Range: 8.2 to —

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 4 benchmarks together — the Point form drives the primary score, while 3 guard(s) constrain the result.

Contributing Benchmarks

Point Primary Point Guard Point Guard MinimumOnly Guard

Evidence & Context

The derived reference value for basal microbial respiration is 8.2 mg CO₂-C/kg/day.

Metric Definition:

Basal Microbial Respiration (BMR) is the rate of CO₂ evolution from soil under standardized laboratory conditions, representing the intrinsic metabolic potential of the soil's microbial community.

Benchmark Definition:

Basal Microbial Respiration measures the natural metabolic activity of soil microbes in the Arid Mountain Ranges & Uplands under conservation management, indicating ecosystem health through CO₂ evolution rates.

Justification:

The benchmark represents the measured microbial functional capacity within a resource-rich 'island of fertility' under native Acacia canopy, serving as the best available analogue for a protected natural area. Confidence is Moderate due to the use of a proxy site outside the specific biome.

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,

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

Preview of Australia - Soils, Climate, Erosion | Britannica

Australia - Soils, Climate, Erosion | Britannica

Contextual Support GreyLiterature

SOIL TESTING, accessed August 1, 2025

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

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.

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

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,

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

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

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

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,

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,

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

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

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

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

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

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

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

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,

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

Context

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

Lifecycle

Status Active
Version 1
Effective From 20 Mar 2026

Notes

No detrimental upper threshold exists; higher respiration rates indicate greater ecosystem health and are naturally limited by resource availability. The optimal state includes BMR > 8.2 mg CO₂-C/kg/day, high microbial biomass (> 200 mg/kg), and low metabolic quotient (qCO₂).

Related Benchmarks

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