Microbial Respiration

AUS-TGP-LVG-SMR General Moderate confidence

Benchmark Value

70 mg/kg/day
Direction: Lower is desirable ↓
Form: MaximumOnly

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

A value of > 70 mg CO2-C/kg/day is therefore proposed as an upper boundary.

Metric Definition:

Microbial respiration is a fundamental process in terrestrial ecosystems, representing the carbon dioxide (CO2) released by heterotrophic microorganisms during the decomposition of soil organic matter (SOM) and plant litter.

Benchmark Definition:

This benchmark defines an upper detrimental threshold for soil microbial respiration in temperate grassy woodlands under livestock grazing, where rates above this may indicate soil carbon instability or net loss.

Justification:

Based on the "Very High" category (>201 ppm) from diagnostic guides, converted to mass-based units.

Sources (1)

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

Haney Test Interpretation Guide v1.0, accessed August 9, 2025

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

Grazing effects on plant cover, soil and microclimate in fragmented woodlands in south-western Australia: Implications for restoration | Request PDF - 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 GreyLiterature

section 2 water quality in the darwin region - Environment and Natural Resources

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 GreyLiterature

3- Build and maintain soil nutrients to improve soil fertility and health in all pasture zones, 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

A functional framework for soil moisture benchmarks in Australian temperate cropping systems based on Field Capacity (FC) and Permanent Wilting Point (PWP)

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

Chapter 9 AUSTRALIAN GRASSLANDS - Food and Agriculture Organization of the United Nations, accessed August 9, 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 Journal

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

Soil Moisture Affects the Rapid Response of Microbes to Labile Organic C Addition

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

Assessing the response of soil carbon in Australia to changing inputs and climate using a consistent modelling framework - BG

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 GreyLiterature

Grazing intensity influence soil microbial communities and their implications for soil respiration | 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

Grazing management for soil carbon in Australia: A review - ResearchGate, accessed May 10, 2026

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

Drought decreases incorporation of recent plant photosynthate into soil food webs regardless of their trophic complexity - PMC, accessed May 10, 2026

View Source
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,
Direct Evidence Journal

Ohio State University Soil Fertility Lab Protocol (2019)

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

Ward Laboratories. (n.d.). Fungal to Bacterial Ratios: What and Why?

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

Inherent Factors Affecting Soil Respiration - USDA

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 GreyLiterature

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

Introducing BASE: the Biomes of Australian Soil Environments soil microbial diversity database - La Trobe, accessed July 29, 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 Government

ANSIS - Australian National Soil Information System - CSIRO, accessed May 7, 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
Contextual Support Methodology Source GreyLiterature

Microbial controls over soil priming effects under chronic nitrogen and phosphorus additions in subtropical forests, 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

Procedure for Soil Respiration (CO2 Evolution from ... - Soil Fertility, 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

Response of Grazing Land Soil Health to Management Strategies: A Summary Review, 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 Government

Soil - CSIRO, accessed July 27, 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 GreyLiterature

Soil health: the foundation of sustainable agriculture - 2001 workshop proceedings - NSW Department of Primary Industries

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 Journal

The optimum temperature of soil microbial respiration

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

Soil Respiration in Semiarid Temperate Grasslands under Various Land Management - PMC - PubMed Central

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

View Source

Context

  • Region Australia
  • Biome Temperate Grassy Woodlands & Plains
  • Land Use Livestock Grazing & Pasture
  • Assessment Not Stated
  • Evidence Type DegradationThreshold

Lifecycle

  • Status Active
  • Version 1
  • Effective From 26 May 2026

Notes

Rates exceeding this level do not necessarily indicate better health; instead, they should be treated as a flag for potential instability or net carbon loss. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

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

— mg/kg/day Moderate
Livestock Grazing & Pasture · Not Stated
OptimalRange Active v2
7 mg/kg/day Moderate
Livestock Grazing & Pasture · Not Stated
MinimumOnly Active v1
— mg/kg/day Moderate
Livestock Grazing & Pasture · Not Stated
OptimalRange Superseded v1