Microbial Respiration

AUS-TSR-FOR-SMR General Moderate confidence

Benchmark Value

No specific value — see range
Range: 20 to 50 mg/kg/day
Optimal Range: 20 to 50
Direction: Higher is desirable ↑
Form: OptimalRange

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 MinimumOnly Guard MaximumOnly Guard

Evidence & Context

An optimal range for a high-functioning tropical production forest is estimated to be 20–50 mg C/kg/day.

Metric Definition:

Soil microbial respiration rate measured as mg CO2-C released per kg of soil per day.

Benchmark Definition:

This benchmark represents the optimal functional range of soil microbial respiration indicating a healthy and resilient production forest in tropical and subtropical rainforests.

Justification:

This range represents a vibrant and efficient microbial community where carbon loss via respiration is sustainably balanced by carbon inputs from primary production.

Sources (1)

Preview of Soil Microbial Biomass, Basal Respiration and Enzyme Activity of Main Forest Types in the Qinling Mountains | PLOS One - Research journals, accessed August 5, 2025,
Soil Microbial Biomass, Basal Respiration and Enzyme Activity of Main Forest Types in the Qinling Mountains | PLOS One - Research journals, accessed August 5, 2025,

Major and persistent shifts in below‐ground ... - yadvinder malhi

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Supporting Sources (3)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Impact of temperature and moisture on heterotrophic soil respiration along a moist tropical forest gradient in Australia - ResearchGate, accessed August 9, 2025
(PDF) Impact of temperature and moisture on heterotrophic soil respiration along a moist tropical forest gradient in Australia - ResearchGate, accessed August 9, 2025
Direct Evidence Journal

(PDF) Impact of temperature and moisture on heterotrophic soil respiration along a moist tropical forest gradient in Australia - ResearchGate, accessed August 4, 2025,

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Preview of Maycock, Colin Rulzion (1998) Plant-soil nutrient relationships in ...
Maycock, Colin Rulzion (1998) Plant-soil nutrient relationships in ...
Direct Evidence Journal

Maycock, Colin Rulzion (1998) Plant-soil nutrient relationships in ...

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Preview of Soil Respiration - Natural Resources Conservation Service
Soil Respiration - Natural Resources Conservation Service
Contextual Support Journal

Reforestation, carbon sequestration and relationships between soil attributes in the Wet Tropics of Australia (Schmidt et al., 2014)

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Context

  • Region Australia
  • Biome Tropical & Subtropical Rainforests
  • Land Use Production Forestry
  • Assessment Conservation Target
  • Vegetation Tropical & Subtropical Rainforests
  • Evidence Type HealthyOperationalRange

Lifecycle

  • Status Active
  • Version 1
  • Effective From 5 Jun 2026

Notes

Management should aim to maintain soil respiration within this range to foster productivity and ecological resilience.

Related Benchmarks

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

50 mg/kg/day Low
Production Forestry · Conservation Target · Tropical & Subtropical Rainforests
Point Active v1
10 mg/kg/day Moderate
Production Forestry · Conservation Target · Tropical & Subtropical Rainforests · growing season
MinimumOnly Active v1
60 mg/kg/day Moderate
Production Forestry · Conservation Target · Tropical & Subtropical Rainforests
MaximumOnly Active v1