Microbial Respiration

AUS-AIF-LVG-SMR General Moderate confidence

Benchmark Value

2 mg/kg/day
Direction: Higher is desirable ↑
Form: MinimumOnly

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

Functional Range Interpretation: The benchmark must be interpreted within a functional range: (1) Lower Critical Threshold (<2 mg CO₂-C/kg/day): Indicates a severely degraded system with critically low soil organic matter (SOM), poor structure, and loss of resilience.

Metric Definition:

Lower critical threshold of basal microbial respiration indicating system degradation.

Benchmark Definition:

Lower critical threshold of basal microbial respiration indicating system degradation in Australian arid inland floodplains under livestock grazing and pasture.

Justification:

This threshold aligns with conditions below the critical aridity threshold (AI < 0.13) where microbial metabolism is fundamentally altered.

Sources (1)

Preview of Soil Respiration | South Dakota Soil Health Coalition, accessed July 30, 2025,
Soil Respiration | South Dakota Soil Health Coalition, accessed July 30, 2025, GreyLiterature

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

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 in Relation to Ecosystem Types in an Arid Area
Soil Respiration in Relation to Ecosystem Types in an Arid Area
Contextual Support Journal

Soil Respiration in Relation to Ecosystem Types in an Arid Area

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 DegradationThreshold

Lifecycle

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

Notes

Indicates a severely degraded system with critically low soil organic matter, poor structure, and loss of resilience.

Related Benchmarks

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

6.4 mg/kg/day Moderate
Livestock Grazing & Pasture · Conservation Target
Point 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