Microbial Respiration

AUS-TSW-CON-SMR General High confidence

Benchmark Value

10.3 mg/kg/day
Range: 10.3 to 10.3 mg/kg/day
Optimal Range: 10.3 to 10.3
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 2 benchmarks together — the Point form drives the primary score, while 1 guard(s) constrain the result.

Contributing Benchmarks

Point Primary MinimumOnly Guard

Evidence & Context

The mean basal respiration rate for the unburnt, protected woodland was 10.3 mg CO₂-C/kg/day.

Metric Definition:

Basal microbial respiration rate representing the metabolic activity of the soil microbial community under standardized laboratory conditions.

Benchmark Definition:

The benchmark is the mean basal respiration from a long-unburnt, protected dry sclerophyll woodland in South Australia, a high-fidelity proxy for best-available condition in a temperate semi-arid ecosystem.

Justification:

This value reflects a state of ecological integrity where soil organic matter inputs, microbial biomass, and nutrient cycling processes are well-maintained in the absence of major recent disturbances.

Sources (1)

Preview of Soil microbial community composition and functions are disrupted by fire and land use in a Mediterranean woodland
Soil microbial community composition and functions are disrupted by fire and land use in a Mediterranean woodland Journal

Soil microbial community composition and functions are disrupted by fire and land use in a Mediterranean woodland

View Source

Supporting Sources (19)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Elevated carbon dioxide increases soil nitrogen and phosphorus availability in a phosphorus-limited Eucalyptus woodland - ResearchGate, accessed July 16, 2025,
(PDF) Elevated carbon dioxide increases soil nitrogen and phosphorus availability in a phosphorus-limited Eucalyptus woodland - ResearchGate, accessed July 16, 2025,
Contextual Support Journal

(PDF) Elevated carbon dioxide increases soil nitrogen and phosphorus availability in a phosphorus-limited Eucalyptus woodland - ResearchGate, accessed July 16, 2025,

View Source
Preview of Australia state of the environment 2021: land, accessed May 11, 2025
Australia state of the environment 2021: land, accessed May 11, 2025
Contextual Support Journal

Management Standards and Procedures for timber harvesting operations in Victoria’s State forests

View Source
Preview of Australian Soils and Landscapes | Monitoring & Data | TERN - esoil.io, accessed July 16, 2025,
Australian Soils and Landscapes | Monitoring & Data | TERN - esoil.io, accessed July 16, 2025,
Contextual Support Government

Australian Soils and Landscapes | Monitoring & Data | TERN - esoil.io, accessed July 16, 2025,

View Source
Preview of Categories - TERN - CSIRO Data Access Portal, accessed July 16, 2025,
Categories - TERN - CSIRO Data Access Portal, accessed July 16, 2025,
Contextual Support Journal

Soil microbial respiration responses to changing temperature and substrate availability in fertile grassland - CSIRO Publishing, accessed July 16, 2025,

View Source
Preview of Climate change impacts and adaptation on Australian farms - DAFF, accessed August 9, 2025
Climate change impacts and adaptation on Australian farms - DAFF, accessed August 9, 2025
Contextual Support

Tool 6.7 Soil health benchmarks and guidelines for managing problem soils

View Source
Preview of Enzyme Estimation | PDF | Soil | Natural Environment - Scribd, accessed July 16, 2025,
Enzyme Estimation | PDF | Soil | Natural Environment - Scribd, accessed July 16, 2025,
Contextual Support GreyLiterature

Enzyme Estimation | PDF | Soil | Natural Environment - Scribd, accessed July 16, 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 Land - MDPI, accessed July 16, 2025,
Land - MDPI, accessed July 16, 2025,
Contextual Support Journal

Land - MDPI, accessed July 16, 2025,

View Source
Preview of Long-term land use change in Australia from native forest decreases all fractions of soil organic carbon, including resistant organic carbon, for cropping but not sown pasture - ResearchGate, accessed August 5, 2025,
Long-term land use change in Australia from native forest decreases all fractions of soil organic carbon, including resistant organic carbon, for cropping but not sown pasture - ResearchGate, accessed August 5, 2025,
Contextual Support Journal

Soil microbial activity and litter turnover in native grazed and ungrazed rangelands in semiarid ecosystem - ResearchGate, accessed July 16, 2025,

View Source
Preview of Microbial biomass and activity in the humus layer following burning - ResearchGate, accessed July 16, 2025,
Microbial biomass and activity in the humus layer following burning - ResearchGate, accessed July 16, 2025,
Contextual Support Journal

Microbial biomass and activity in the humus layer following burning - ResearchGate, accessed July 16, 2025,

View Source
Preview of Nationally Threatened Ecological Communities of the Victorian Volcanic Plain: Natural Temperate Grassland & Grassy Eucalypt Woodland - DCCEEW, accessed August 12, 2025,
Nationally Threatened Ecological Communities of the Victorian Volcanic Plain: Natural Temperate Grassland & Grassy Eucalypt Woodland - DCCEEW, accessed August 12, 2025,
Contextual Support Journal

Environmental Stewardship - Box Gum Grassy Woodland Project - Information Booklet - DCCEEW, accessed August 12, 2025,

View Source
Preview of Plant genus (Acacia and Eucalyptus) alters soil microbial community structure and relative abundance within revegetated shelterbelts | Request PDF - ResearchGate
Plant genus (Acacia and Eucalyptus) alters soil microbial community structure and relative abundance within revegetated shelterbelts | Request PDF - ResearchGate
Contextual Support Journal

Aggregate stability and physical protection of soil organic carbon in semi-arid steppe soils | Request PDF - ResearchGate, accessed July 16, 2025,

View Source
Preview of Response of soil microbial functionality and soil properties to ..., accessed July 16, 2025,
Response of soil microbial functionality and soil properties to ..., accessed July 16, 2025,
Contextual Support Journal

Response of soil microbial functionality and soil properties to ..., accessed July 16, 2025,

View Source
Preview of Soil and Landscape Grid of Australia - CSIRO, accessed July 30, 2025,
Soil and Landscape Grid of Australia - CSIRO, accessed July 30, 2025,
Contextual Support

Soil and Landscape Grid of Australia - CSIRO, accessed August 1, 2025

View Source
Preview of Soil and Landscape Grid of Australia - esoil.io, accessed July 13, 2025
Soil and Landscape Grid of Australia - esoil.io, accessed July 13, 2025
Contextual Support Government

Soil and Landscape Grid of Australia - esoil.io, accessed July 26, 2025,

View Source
Preview of Soil microbial biomass, activity and community composition in adjacent native and plantation forests of subtropical Australia | Request PDF - ResearchGate
Soil microbial biomass, activity and community composition in adjacent native and plantation forests of subtropical Australia | Request PDF - ResearchGate
Contextual Support Journal

Soil water characteristics of a red chromosol and brown vertosol and ..., accessed May 19, 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, accessed July 16, 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 Temperature response of soil respiration largely unaltered with experimental warming, accessed July 16, 2025,
Temperature response of soil respiration largely unaltered with experimental warming, accessed July 16, 2025,
Contextual Support Journal

Controls on Soil Respiration in Semiarid Soils | Request PDF - ResearchGate, accessed July 16, 2025,

View Source

Context

  • Region Australia
  • Biome Temperate Semi-Arid Shrublands & Open Woodlands
  • Land Use Conservation / Protected Natural Areas
  • Assessment Pristine Reference
  • Vegetation Woodland
  • Evidence Type ReferenceCondition

Lifecycle

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

Notes

No upper detrimental threshold — higher values are always better up to natural saturation. An upper detrimental threshold is not supported; however, excessively high respiration relative to microbial biomass (a high metabolic quotient, qCO₂) indicates system stress and inefficiency, a state more typical of disturbed systems. Optimal function is characterized by high, stable respiration within a system possessing high organic matter and microbial biomass.

Related Benchmarks

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

6.2 mg/kg/day High
Conservation / Protected Natural Areas · Pristine Reference · Woodland
MinimumOnly Active v1