Microbial Respiration

AUS-ASC-FOR-SMR General Moderate confidence

Benchmark Value

254 mg/kg/day
Range: 254 to 254 mg/kg/day
Optimal Range: 254 to 254
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

The reference benchmark for basal microbial respiration is 254 mg CO₂-C/kg/day, measured under standardized laboratory conditions.

Metric Definition:

Basal microbial respiration rate measured under standardized laboratory conditions in topsoil of a healthy native snow gum woodland.

Benchmark Definition:

Basal microbial respiration rate as an indicator of soil microbial activity and health in the Alpine and Subalpine Complex biome under production forestry land use.

Justification:

Derived from a native sub-alpine woodland ecosystem as a proxy for sustainable forestry, measured under controlled lab conditions at 20°C, representing potential microbial activity.

Sources (1)

Preview of Carbon Cycling in Sub-alpine Ecosystems
Carbon Cycling in Sub-alpine Ecosystems

Carbon Cycling in Sub-alpine Ecosystems

View Source

Supporting Sources (2)

Additional references from the underlying research that informed this benchmark.

Preview of Microbial Degradation of Plant Residues Rapidly Causes Long-Lasting Hypoxia in Soil upon Irrigation and Affects Leaching of Nitrogen and Metals - ResearchGate
Microbial Degradation of Plant Residues Rapidly Causes Long-Lasting Hypoxia in Soil upon Irrigation and Affects Leaching of Nitrogen and Metals - ResearchGate
Contextual Support Journal

Microbial Degradation of Plant Residues Rapidly Causes Long-Lasting Hypoxia in Soil upon Irrigation and Affects Leaching of Nitrogen and Metals - ResearchGate

View Source
Preview of Microbiological Indicators for Assessing the Effects of Agricultural Practices on Soil Health: A Review - MDPI, accessed on June 5, 2025
Microbiological Indicators for Assessing the Effects of Agricultural Practices on Soil Health: A Review - MDPI, accessed on June 5, 2025
Contextual Support Journal

Microbiological Indicators for Assessing the Effects of Agricultural Practices on Soil Health: A Review - MDPI, accessed August 13, 2025,

View Source

Context

  • Region Australia
  • Biome Alpine and Subalpine Complex
  • Land Use Production Forestry
  • Assessment Conservation Target
  • Vegetation Forest
  • 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. This value is a proxy from a native ecosystem, not a direct measurement from production forestry. It represents potential respiration under standardized conditions, not fluctuating field rates. The benchmark is central to the optimal functional range for sustainable management.