Microbial Respiration

AUS-TGP-LVG-SMR General Moderate confidence

Benchmark Value

No specific value — see range
Range: 22 to 44 mg/kg/day
Thresholds: Lower: 7, Upper: 70
Optimal Range: 22 to 44
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 5 benchmarks together — the OptimalRange form drives the primary score, while 4 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary LowerThreshold Guard UpperThreshold Guard OptimalRange Guard Point Guard

Evidence & Context

a reference range of 22 – 44 mg CO2​-C/kg/day has been established.

Metric Definition:

Microbial respiration rate measured as mg CO2-C released per kg of soil per day, indicating soil biological activity and health.

Benchmark Definition:

Derived benchmark representing the 'High' functional category for soil microbial activity in temperate Australian grazing systems.

Justification:

Derived from Ward Laboratories' 'Haney Soil Health Test Interpretation Guide' and Ohio State University Soil Fertility Lab Protocol, representing a robustly active system without entering potentially unstable 'Very High' category.

Sources (1)

Preview of Haney Test Interpretation Guide v1.0 - Ward Laboratories, Inc., accessed July 30, 2025,
Haney Test Interpretation Guide v1.0 - Ward Laboratories, Inc., accessed July 30, 2025, Journal

Ohio State University Soil Fertility Lab Protocol (2019)

View Source

Supporting Sources (29)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Grazing management for sustainable grazing systems - ResearchGate, accessed August 9, 2025
(PDF) Grazing management for sustainable grazing systems - ResearchGate, accessed August 9, 2025
Contextual Support GreyLiterature

(PDF) Grazing management for sustainable grazing systems - ResearchGate, accessed July 23, 2025,

View Source
Preview of (PDF) Livestock grazing management and biodiversity conservation in Australian temperate grassy landscapes - ResearchGate, accessed May 11, 2025
(PDF) Livestock grazing management and biodiversity conservation in Australian temperate grassy landscapes - ResearchGate, accessed May 11, 2025
Contextual Support Journal

Fertilisers and the environment - NSW Department of Primary Industries, accessed May 11, 2025

View Source
Preview of 3- Build and maintain soil nutrients to improve soil fertility and health in all pasture zones, accessed August 9, 2025
3- Build and maintain soil nutrients to improve soil fertility and health in all pasture zones, accessed August 9, 2025
Contextual Support Journal

(PDF) Sustainable grazing systems for the Central Tablelands of New South Wales. 1. Agronomic implications of vegetation–environment associations within a naturalised temperate perennial grassland - ResearchGate, accessed August 9, 2025

View Source
Preview of Altered soil microbial community at elevated CO2 leads to loss of ..., accessed August 9, 2025
Altered soil microbial community at elevated CO2 leads to loss of ..., accessed August 9, 2025
Contextual Support Journal

ASSESSING STRATEGIC GRAZING EFFECTS ON IMPROVING, accessed August 9, 2025

View Source
Preview of Chapter 9 AUSTRALIAN GRASSLANDS - Food and Agriculture Organization of the United Nations, accessed August 9, 2025
Chapter 9 AUSTRALIAN GRASSLANDS - Food and Agriculture Organization of the United Nations, accessed August 9, 2025
Contextual Support Government

National Soil Strategy - DAFF, accessed August 4, 2025,

View Source
Preview of Climate change impacts and adaptation on Australian farms - DAFF, accessed August 9, 2025
Climate change impacts and adaptation on Australian farms - DAFF, accessed August 9, 2025
Contextual Support

Tool 6.7 Soil health benchmarks and guidelines for managing problem soils

View Source
Preview of Comparison of temperature effects on soil respiration and bacterial and fungal growth rates | FEMS Microbiology Ecology | Oxford Academic, accessed July 30, 2025,
Comparison of temperature effects on soil respiration and bacterial and fungal growth rates | FEMS Microbiology Ecology | Oxford Academic, accessed July 30, 2025,
Contextual Support Journal

Quantifying thermal adaptation of soil microbial respiration - PMC - PubMed Central, accessed August 13, 2025,

View Source
Preview of Grazing Impacts on Soil Carbon and Microbial Communities in a Mixed-Grass Ecosystem - USDA ARS
Grazing Impacts on Soil Carbon and Microbial Communities in a Mixed-Grass Ecosystem - USDA ARS
Contextual Support Journal

Grazing Impacts on Soil Carbon and Microbial Communities in a Mixed-Grass Ecosystem - USDA ARS, accessed August 9, 2025

View Source
Preview of Grazing intensity influence soil microbial communities and their implications for soil respiration | Request PDF - ResearchGate, accessed August 9, 2025
Grazing intensity influence soil microbial communities and their implications for soil respiration | Request PDF - ResearchGate, accessed August 9, 2025
Contextual Support Journal

Grazing triggers soil carbon loss by altering plant roots and their control on soil microbial community | Request PDF - ResearchGate, accessed August 9, 2025

View Source
Preview of Grazing management for soil carbon in Australia: A review - ResearchGate, accessed August 5, 2025,
Grazing management for soil carbon in Australia: A review - ResearchGate, accessed August 5, 2025,
Contextual Support Journal

Managing grazing to increase ground cover in rangelands: using remote sensing to detect change | Request PDF - ResearchGate

View Source
Preview of Grazing management for soil carbon in Australia: A review, accessed August 9, 2025
Grazing management for soil carbon in Australia: A review, accessed August 9, 2025
Contextual Support Journal

Grazing management for soil carbon in Australia: A review, accessed August 9, 2025

View Source
Preview of Grazing Regulates Changes in Soil Microbial Communities in Plant-Soil Systems - MDPI
Grazing Regulates Changes in Soil Microbial Communities in Plant-Soil Systems - MDPI
Contextual Support Journal

Managing Pastures for Soil Health FACT SHEET 12 - Local Land Services, accessed July 11, 2025,

View Source
Preview of Haney Test Interpretation Guide v1.0, accessed August 9, 2025
Haney Test Interpretation Guide v1.0, accessed August 9, 2025
Methodology Source

Sustainable Land Use Enhances Soil Microbial Respiration Responses to Experimental Heat Stress - PMC - PubMed Central, accessed August 13, 2025,

View Source
Preview of How Biodiversity-Friendly Is Regenerative Grazing? - Frontiers, accessed July 19, 2025,
How Biodiversity-Friendly Is Regenerative Grazing? - Frontiers, accessed July 19, 2025,
Contextual Support Journal

Soil Fungal:Bacterial Ratios Are Linked to Altered Carbon Cycling - PMC - PubMed Central, accessed July 30, 2025,

View Source
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

Twenty years of progress, challenges, and opportunities in measuring and understanding soil respiration, accessed August 13, 2025,

View Source
Preview of Management-intensive Grazing (MiG) and Soil Health - 0.570 - CSU Extension - Colorado State University, accessed August 9, 2025
Management-intensive Grazing (MiG) and Soil Health - 0.570 - CSU Extension - Colorado State University, accessed August 9, 2025
Contextual Support Government

Management-intensive Grazing (MiG) and Soil Health - 0.570 - CSU Extension - Colorado State University, accessed August 9, 2025

View Source
Preview of Managing Grazing to Restore Soil Health, Ecosystem Function, and Ecosystem Services - Frontiers, accessed August 9, 2025
Managing Grazing to Restore Soil Health, Ecosystem Function, and Ecosystem Services - Frontiers, accessed August 9, 2025
Contextual Support Journal

Contrasting Soil pH Effects on Fungal and Bacterial Growth Suggest Functional Redundancy in Carbon Mineralization - PMC, accessed August 9, 2025,

View Source
Preview of Mapping soil organic carbon fractions for Australia, their stocks, and uncertainty - BG, accessed July 8, 2025
Mapping soil organic carbon fractions for Australia, their stocks, and uncertainty - BG, accessed July 8, 2025
Contextual Support Journal

The Healthy Soils Project | Meat & Livestock Australia - MLA, accessed August 9, 2025

View Source
Preview of Microbial controls over soil priming effects under chronic nitrogen and phosphorus additions in subtropical forests, accessed August 9, 2025
Microbial controls over soil priming effects under chronic nitrogen and phosphorus additions in subtropical forests, accessed August 9, 2025
Methodology Source Journal

Kuzyakov Y.. Priming effects: interactions between living and dead organic matter. Soil Biol Biochem 42: 1363-1371 - ResearchGate, accessed August 9, 2025

View Source
Preview of Procedure for Soil Respiration (CO2 Evolution from ... - Soil Fertility, accessed August 9, 2025
Procedure for Soil Respiration (CO2 Evolution from ... - Soil Fertility, accessed August 9, 2025
Methodology Source Journal

Measuring Soil C Mineralization Rates - EEMB Research, accessed August 9, 2025

View Source
Preview of REGENERATIVE GRAZING, CARBON, AND CLIMATE - Pasture Project, accessed August 9, 2025
REGENERATIVE GRAZING, CARBON, AND CLIMATE - Pasture Project, accessed August 9, 2025
Contextual Support Journal

REGENERATIVE GRAZING, CARBON, AND CLIMATE - Pasture Project, accessed August 9, 2025

View Source
Preview of Response of Grazing Land Soil Health to Management Strategies: A Summary Review, accessed August 9, 2025
Response of Grazing Land Soil Health to Management Strategies: A Summary Review, accessed August 9, 2025
Contextual Support Journal

Temperate pasture legumes in Australia—their history, current use, and future prospects - BioOne Complete, accessed August 9, 2025

View Source
Preview of Seasonal dynamics of soil microbial growth, respiration, biomass, and carbon use efficiency in temperate soils - University of Edinburgh Research Explorer, accessed August 9, 2025
Seasonal dynamics of soil microbial growth, respiration, biomass, and carbon use efficiency in temperate soils - University of Edinburgh Research Explorer, accessed August 9, 2025
Contextual Support Journal

Seasonal dynamics of soil microbial growth, respiration, biomass, and carbon use efficiency in temperate soils - University of Edinburgh Research Explorer, accessed August 9, 2025

View Source
Preview of Soil - CSIRO
Soil - CSIRO
Contextual Support

Soil - CSIRO, accessed August 9, 2025

View Source
Preview of Soil health: the foundation of sustainable agriculture - 2001 workshop proceedings - NSW Department of Primary Industries, accessed July 25, 2025,
Soil health: the foundation of sustainable agriculture - 2001 workshop proceedings - NSW Department of Primary Industries, accessed July 25, 2025,
Contextual Support Journal

Pasture health kit - Making More From Sheep, accessed August 9, 2025

View Source
Preview of Soil temperature, microbial biomass and enzyme activity are the critical factors affecting soil respiration in different soil layers in Ziwuling Mountains, China - Frontiers, accessed July 30, 2025,
Soil temperature, microbial biomass and enzyme activity are the critical factors affecting soil respiration in different soil layers in Ziwuling Mountains, China - Frontiers, accessed July 30, 2025,
Contextual Support

Soil Respiration - Natural Resources Conservation Service, accessed July 28, 2025,

View Source
Preview of Temperature sensitivity of soil respiration rates enhanced by microbial community response - PubMed, accessed July 30, 2025,
Temperature sensitivity of soil respiration rates enhanced by microbial community response - PubMed, accessed July 30, 2025,
Contextual Support Journal

Temperature sensitivity of soil respiration rates enhanced by microbial community response - PubMed, accessed August 13, 2025,

View Source
Preview of The soil priming effect - nau ecoss, accessed August 9, 2025
The soil priming effect - nau ecoss, accessed August 9, 2025
Contextual Support Journal

The soil priming effect - nau ecoss, accessed August 9, 2025

View Source
Preview of Tool 6.7 Soil health benchmarks and guidelines for managing problem soils, accessed August 9, 2025
Tool 6.7 Soil health benchmarks and guidelines for managing problem soils, accessed August 9, 2025
Contextual Support GreyLiterature

Managing soils to keep them healthy and productive - MLA, accessed August 5, 2025,

View Source

Context

  • Region Australia
  • Biome Temperate Grassy Woodlands & Plains
  • Land Use Livestock Grazing & Pasture
  • Assessment Pristine Reference
  • Evidence Type ReferenceCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 20 Mar 2026

Notes

Lower Critical Threshold: 7 mg C/kg soil/d. Upper Detrimental Threshold: 70 mg C/kg soil/d. Optimal Range: 22 - 70 mg C/kg soil/d represents balanced high microbial activity. RangeFixup applied 2026-03-21 22:21 UTC: OptimalRangeHigh: 70 → 44; UpperBound: 44 → 70 [Migration] Original wider evidence range: 22 – 70 (retained OptimalRange: 22 – 44)