Microbial Respiration

AUS-TGP-FOR-SMR General Moderate confidence

Benchmark Value

5 mg/kg/day
Range: 5 to 15 mg/kg/day
Optimal Range: 5 to 15
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 OptimalRange form drives the primary score, while 3 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary Point Guard OptimalRange Guard Point Guard

Evidence & Context

A benchmark of 5.0 mg CO2−C/kg/day is proposed.

Metric Definition:

Basal soil microbial respiration ... represents the metabolic activity of the soil's heterotrophic microbial community, primarily bacteria and fungi, as they decompose soil organic matter (SOM).

Benchmark Definition:

A benchmark representing high ecological function, derived through a triangulation of data from high-quality remnant woodland analogues and international studies on mature forest systems.

Justification:

The value is anchored by direct Australian data from Kaur et al. (2009) which measured microbial respiration in uncleared woodland sites, and triangulated with international analogue studies (Wang et al. 2012).

Sources (1)

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, Journal

Soil respiration rate and its sensitivity to temperature in pasture systems of dry-tropics - Taylor & Francis Online

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Supporting Sources (13)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Carbon storage in the soils and vegetation of contrasting land ...
(PDF) Carbon storage in the soils and vegetation of contrasting land ...
Contextual Support Journal

(PDF) Carbon storage in the soils and vegetation of contrasting land ..., accessed August 10, 2025,

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Preview of Carbon storage in the soils and vegetation of contrasting land uses in northern New South Wales, Australia
Carbon storage in the soils and vegetation of contrasting land uses in northern New South Wales, Australia
Contextual Support GreyLiterature

Drying temperature effects on bulk density and carbon density determination in soils of northern New South Wales

View Source
Preview of Chronic nitrogen additions reduce total soil respiration and microbial respiration in temperate forest soils at the Harvard Fore
Chronic nitrogen additions reduce total soil respiration and microbial respiration in temperate forest soils at the Harvard Fore
Contextual Support Journal

Chronic nitrogen additions reduce total soil respiration and microbial respiration in temperate forest soils at the Harvard Fore

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Preview of Coarse woody debris reduces the rate of moisture loss from surface soils of cleared temperate Australian woodlands - CSIRO Publishing
Coarse woody debris reduces the rate of moisture loss from surface soils of cleared temperate Australian woodlands - CSIRO Publishing
Contextual Support Journal

Coarse woody debris reduces the rate of moisture loss from surface soils of cleared temperate Australian woodlands - CSIRO Publishing, accessed July 30, 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 Soil Compaction Affects the Growth and Establishment of Street Trees in Urban Australia
Soil Compaction Affects the Growth and Establishment of Street Trees in Urban Australia
Contextual Support Journal

Use of Impact Penetrometer to Determine Changes in Soil Compactness After Entracon Sioux EH30 Timber Harvesting - Crojfe

View Source
Preview of Soil Compaction Affects the Growth and Establishment of Street Trees in Urban Australia, accessed August 4, 2025,
Soil Compaction Affects the Growth and Establishment of Street Trees in Urban Australia, accessed August 4, 2025,
Contextual Support Journal

Soil compaction around Eucalyptus grandis roots: a micromorphological study, accessed August 10, 2025,

View Source
Preview of Soil methane oxidation in both dry and wet temperate eucalypt forests shows a near-identical relationship with soil air - BG
Soil methane oxidation in both dry and wet temperate eucalypt forests shows a near-identical relationship with soil air - BG
Contextual Support Journal

Soil methane oxidation in both dry and wet temperate eucalypt forests shows a near-identical relationship with soil air - BG, accessed August 10, 2025,

View Source
Preview of Soil Microbial Biomass, Basal Respiration and Enzyme Activity of Main Forest Types in the Qinling Mountains - PubMed Central
Soil Microbial Biomass, Basal Respiration and Enzyme Activity of Main Forest Types in the Qinling Mountains - PubMed Central
Contextual Support Direct Evidence Journal

Soil Microbial Biomass, Basal Respiration and Enzyme Activity of Main Forest Types in the Qinling Mountains - PubMed Central

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,

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Preview of Terrestrial Ecosystem Research Network - Research Data Australia
Terrestrial Ecosystem Research Network - Research Data Australia
Contextual Support Government

Terrestrial Ecosystem Research Network - Research Data Australia, accessed August 10, 2025,

View Source
Preview of The Role of Aboriginal Burning in the Biogeography of the Temperate Grasslands of South-Eastern Australia - La Trobe
The Role of Aboriginal Burning in the Biogeography of the Temperate Grasslands of South-Eastern Australia - La Trobe
Contextual Support Journal

Cunningham, S. A., et al. (2015). Woodland habitat structures are affected by both agricultural land management and abiotic conditions. Landscape Ecology.

View Source
Preview of Understorey productivity in temperate grassy woodland responds to soil water availability but not to elevated [CO2 ] - PubMed, accessed August 9, 2025
Understorey productivity in temperate grassy woodland responds to soil water availability but not to elevated [CO2 ] - PubMed, accessed August 9, 2025
Contextual Support GreyLiterature

SNOWY MOUNTAIN FORESTED HILLSLOPE SOIL CHARACTERISATION, SOIL HYDROLOGICAL PROPERTIES AND SOIL GEOCHEMISTRY PROGRAM

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Context

  • Region Australia
  • Biome Temperate Grassy Woodlands & Plains
  • Land Use Production Forestry
  • Assessment Pristine Reference
  • Evidence Type ReferenceCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 26 May 2026

Notes

Lower Critical Threshold: 2 mg/kg/day. No upper detrimental threshold — higher values are always better up to natural saturation. The benchmark is derived from data on microbial respiration in uncleared Australian temperate woodland sites, which serve as a high-quality analogue for the 'best available condition' achievable under sustainable production forestry.

Related Benchmarks

Other benchmarks in the AUS-TGP-FOR-SMR family.

— mg/kg/day Moderate
Production Forestry · Pristine Reference
OptimalRange Active v1
2 mg/kg/day Moderate
Production Forestry · Not Stated
LowerThreshold Active v1