Microbial Respiration

AUS-AIF-LVG-SMR General Moderate confidence

Benchmark Value

6.4 mg/kg/day
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 7 benchmarks together — the OptimalRange form drives the primary score, while 6 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary Point Guard MinimumOnly Guard MaximumOnly Guard Point Guard MinimumOnly Guard OptimalRange Guard

Evidence & Context

The final benchmark recommendation and its interpretive context are summarized in the table below.

Metric Definition:

Basal microbial respiration rate measured as mg CO2-C per kg of soil per day under standardized laboratory conditions.

Benchmark Definition:

Basal microbial respiration as a measure of soil biological activity and health in Australian arid inland floodplains under livestock grazing and pasture.

Justification:

This value is a synthesized proxy derived from the mean soil respiration rate (0.86 µmol CO₂ m⁻² s⁻¹) of a high-functioning, natural arid scrubland ecosystem, converted to mg CO2-C/kg/day using assumptions about soil depth and bulk density.

Sources (1)

Preview of Soil Respiration in Relation to Ecosystem Types in an Arid Area
Soil Respiration in Relation to Ecosystem Types in an Arid Area Journal

Soil Respiration in Relation to Ecosystem Types in an Arid Area

View Source

Supporting Sources (4)

Additional references from the underlying research that informed this benchmark.

Preview of Inherent Factors Affecting Soil Respiration - USDA, accessed July 30, 2025,
Inherent Factors Affecting Soil Respiration - USDA, accessed July 30, 2025,
Contextual Support Journal

Inherent Factors Affecting Soil Respiration - USDA

View Source
Preview of Managing Grazing to Restore Soil Health, Ecosystem Function, and Ecosystem Services
Managing Grazing to Restore Soil Health, Ecosystem Function, and Ecosystem Services
Contextual Support GreyLiterature

Managing Grazing to Restore Soil Health, Ecosystem Function, and Ecosystem Services

View Source
Preview of Soil Respiration | South Dakota Soil Health Coalition, accessed July 30, 2025,
Soil Respiration | South Dakota Soil Health Coalition, accessed July 30, 2025,
Direct Evidence GreyLiterature

Original Research Article QUANTIFICATION OF MICROBIAL BIOMASSCARBON AND NITROGENIN LEAF LITTER AMENDED SOIL IN NORTHERN NIGERIA - AWS

View Source
Preview of Soil Respiration in Relation to Ecosystem Types in an Arid Area, accessed July 19, 2025,
Soil Respiration in Relation to Ecosystem Types in an Arid Area, accessed July 19, 2025,
Contextual Support Journal

Top 6 Sustainable Forest Management Techniques, accessed July 31, 2025

View Source

Context

  • Region Australia
  • Biome Arid Inland Floodplains & Ephemeral River Systems
  • Land Use Livestock Grazing & Pasture
  • Assessment Conservation Target
  • Evidence Type ReferenceCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 3 Jun 2026

Notes

Lower Critical Threshold: 2 mg/kg/day. Optimal Range: 4–10 mg/kg/day. Upper Detrimental Threshold: 15 mg/kg/day. The benchmark must be interpreted within this functional range indicating degradation, healthy function, and instability respectively.

Related Benchmarks

Other benchmarks in the AUS-AIF-LVG-SMR family.

2 mg/kg/day Moderate
Livestock Grazing & Pasture · Conservation Target
MinimumOnly Active v1
15 mg/kg/day Moderate
Livestock Grazing & Pasture · Conservation Target
MaximumOnly Active v1
— mg/kg/day Moderate
Livestock Grazing & Pasture · Conservation Target
OptimalRange Active v1