Microbial Respiration

AUS-TGP-FOR-SMR General Moderate confidence

Benchmark Value

5 mg/kg/day

Range: 5 to 15 mg/kg/day

Thresholds: Lower: 2, Upper: —

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 2 benchmarks together — the Point form drives the primary score, while 1 guard(s) constrain the result.

Contributing Benchmarks

Point Primary Point Guard

Evidence & Context

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

Metric Definition:

Basal soil microbial respiration representing the metabolic activity of the soil's heterotrophic microbial community.

Benchmark Definition:

Basal soil microbial respiration as a measure of soil biological activity and ecosystem function in temperate grassy woodlands and plains under production forestry.

Justification:

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. Confidence is 'Moderate' due to the necessity of converting field flux data to a mass-specific rate and triangulating with international analogue studies.

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, accessed August 13, 2025,

View Source

Supporting Sources (13)

Additional references from the underlying research that informed this benchmark.

(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,

View Source

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

Contextual Support Journal

Comparison of grazed and cleared temperate grassy woodlands in eastern Australia: patterns in space and inferences in time - ResearchGate, accessed August 10, 2025,

View Source

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

Contextual Support Journal

Relationships between field management, soil health, and microbial, accessed August 10, 2025,

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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 | Soil Research, accessed August 28, 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 August 28, 2025,

View Source

Soil Compaction Affects the Growth and Establishment of Street Trees in Urban Australia

Contextual Support Journal

Soil Compaction Affects the Growth and Establishment of Street Trees in Urban Australia, accessed August 10, 2025,

View Source

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

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

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

Contextual Support Journal

Soil Microbial Biomass, Basal Respiration and Enzyme Activity of Main Forest Types in the Qinling Mountains - PubMed Central, accessed August 10, 2025,

View Source

Soil Respiration - Natural Resources Conservation Service, accessed July 30, 2025,

Contextual Support Journal

Inherent Factors Affecting Soil Respiration - USDA, accessed August 10, 2025,

View Source

Terrestrial Ecosystem Research Network - Research Data Australia

Contextual Support Government

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

View Source

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 Journal

(PDF) The impact of soil disturbance on root development in ..., accessed May 15, 2025

View Source

Context

Region Australia
Biome Temperate Grassy Woodlands & Plains
Land Use Production Forestry
Assessment Conservation Target
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 20 Mar 2026

Notes

Lower Critical Threshold: 2 mg/kg/day. No upper detrimental threshold — higher values are always better up to natural saturation. The optimal range for a high-functioning system is 5.0−15.0 mg/kg/day.