Microbial Respiration

AUS-AKW-LVG-SMR General Low confidence

Benchmark Value

4.7 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 15 benchmarks together — the OptimalRange form drives the primary score, while 14 guard(s) constrain the result.

Contributing Benchmarks

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

Evidence & Context

The derived benchmark value is 4.7 mg CO₂-C/kg/day. This value is representative of the mean microbial respiration rate expected in the top 10 cm of soil under a well-managed, rest-rotation grazing system—a management approach considered to be a proxy for best-practice regenerative principles in this context.

Metric Definition:

Microbial respiration rate measured as mg CO₂-C released per kg of soil per day, representing microbial metabolic activity in the top 10 cm of soil.

Benchmark Definition:

This benchmark represents the typical microbial respiration rate in the top 10 cm of soil under well-managed grazing in arid karstic woodlands and shrublands, indicating soil biological activity and ecosystem health.

Justification:

Derived from a proxy study in an analogous semi-arid steppe ecosystem under a rest-rotation grazing system, with explicit assumptions and conversions detailed in the report.

Sources (1)

Soil respiration and its Q10 response to various grazing systems of a typical steppe in Inner Mongolia, China Journal

Soil respiration and its Q10 response to various grazing systems of a typical steppe in Inner Mongolia, China

View Source

Context

Region Australia
Biome Arid Karstic Woodlands & Shrublands
Land Use Livestock Grazing & Pasture
Assessment Not Stated
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 4 Jun 2026

Notes

Lower Critical Threshold: 3.5 mg/kg/day. No upper detrimental threshold — higher values are always better up to natural saturation. The benchmark is proxy-based due to lack of direct data for the Australian biome. Respiration is pulse-driven (Birch effect) and highly episodic. The upper detrimental threshold is conceptual, defined by net carbon balance rather than a fixed respiration rate. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

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