Microbial Respiration

AUS-TMI-CON-SMR General Moderate confidence

Benchmark Value

13.3 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 5 benchmarks together — the OptimalRange form drives the primary score, while 4 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary Point Guard Point Guard Point Guard Point Guard

Evidence & Context

This benchmark represents the calculated mean annual heterotrophic (microbial) respiration rate for a high-functioning, high-carbon lowland tropical rainforest soil.

Metric Definition:

Heterotrophic (microbial) respiration rate measured as the flux of CO2-C from soil microbial activity, excluding root respiration.

Benchmark Definition:

Mean annual microbial respiration rate in a high-functioning tropical rainforest soil proxy within protected maritime island conservation areas.

Justification:

Derived from a proxy mainland tropical rainforest ecosystem using heterotrophic respiration data and soil bulk density to convert area-based flux to mass-based rate.

Sources (1)

Preview of Impact of temperature and moisture on heterotrophic soil respiration along a moist tropical forest gradient in Australia

Impact of temperature and moisture on heterotrophic soil respiration along a moist tropical forest gradient in Australia

Supporting Sources (27)

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,

Preview of Accessing disparate soil data | TERN Australia

Accessing disparate soil data | TERN Australia

Contextual Support Government

(PDF) Final report Scoping Study of Soil Management in Livestock Grazing Systems

Preview of Common soil types | Environment, land and water | Queensland ...

Common soil types | Environment, land and water | Queensland ...

Contextual Support Government

Phosphorus nutrition of phosphorus-sensitive Australian native ...

Preview of Comparison and environmental controls of soil respiration in primary and secondary dry dipterocarp forests in Thailand - Frontiers, accessed August 4, 2025,

Comparison and environmental controls of soil respiration in primary and secondary dry dipterocarp forests in Thailand - Frontiers, accessed August 4, 2025,

Contextual Support Journal

Spatial and temporal variation in soil respiration in a ... - ctfs.si.edu, accessed August 4, 2025,

Preview of Controls of Temporal Variations on Soil Respiration in a Tropical Lowland Rainforest in Hainan Island, China - BioOne Complete, accessed July 28, 2025,

Controls of Temporal Variations on Soil Respiration in a Tropical Lowland Rainforest in Hainan Island, China - BioOne Complete, accessed July 28, 2025,

Contextual Support Journal

Controls of Temporal Variations on Soil Respiration in a Tropical Lowland Rainforest in Hainan Island, China - BioOne Complete, accessed August 4, 2025,

Preview of Early response of soil properties and function to riparian rainforest restoration - Lake Baroon Catchment Care Group, accessed July 18, 2025,

Early response of soil properties and function to riparian rainforest restoration - Lake Baroon Catchment Care Group, accessed July 18, 2025,

Contextual Support GreyLiterature

Ecology of Nitrogen Fixing, Nitrifying, and Denitrifying ...

Preview of Ecological Regions Of Australia - WorldAtlas, accessed July 27, 2025,

Ecological Regions Of Australia - WorldAtlas, accessed July 27, 2025,

Contextual Support GreyLiterature

Ecological Regions Of Australia - WorldAtlas, accessed August 4, 2025,

Preview of Global patterns of nutrient limitation in soil microorganisms - PNAS, accessed August 4, 2025,

Global patterns of nutrient limitation in soil microorganisms - PNAS, accessed August 4, 2025,

Contextual Support

Global patterns of nutrient limitation in soil microorganisms - PNAS, accessed August 4, 2025,

Preview of Healthy Land Ecosystems | TSRA State of the Environment, accessed August 4, 2025,

Healthy Land Ecosystems | TSRA State of the Environment, accessed August 4, 2025,

Contextual Support GreyLiterature

Great Barrier Reef - Wikipedia, accessed August 4, 2025,

Preview of Impact of temperature and moisture on heterotrophic soil respiration along a moist tropical forest gradient in Australia - CSIRO Publishing, accessed August 4, 2025,

Impact of temperature and moisture on heterotrophic soil respiration along a moist tropical forest gradient in Australia - CSIRO Publishing, accessed August 4, 2025,

Direct Evidence Journal

Impact of temperature and moisture on heterotrophic soil respiration along a moist tropical forest gradient in Australia - CSIRO Publishing, accessed August 4, 2025,

Preview of Inherent Factors Affecting Soil Respiration - Solvita, accessed August 5, 2025,

Inherent Factors Affecting Soil Respiration - Solvita, accessed August 5, 2025,

Contextual Support Journal

Inherent Factors Affecting Soil Respiration - Solvita

Preview of Inherent Factors Affecting Soil Respiration - USDA, accessed August 4, 2025,

Inherent Factors Affecting Soil Respiration - USDA, accessed August 4, 2025,

Methodology Source Government

Inherent Factors Affecting Soil Respiration - USDA, accessed August 4, 2025,

Preview of Lord Howe Island Group - UNESCO World Heritage Centre, accessed August 3, 2025,

Lord Howe Island Group - UNESCO World Heritage Centre, accessed August 3, 2025,

Contextual Support

Lord Howe Island Group - UNESCO World Heritage Centre

Preview of Lord Howe Island Group - World Heritage Places - DCCEEW, accessed August 4, 2025,

Lord Howe Island Group - World Heritage Places - DCCEEW, accessed August 4, 2025,

Contextual Support Government

Lord Howe Island Group - World Heritage Places - DCCEEW, accessed August 4, 2025,

Preview of Lord Howe Island subtropical forests | EBSCO Research Starters, accessed August 3, 2025,

Lord Howe Island subtropical forests | EBSCO Research Starters, accessed August 3, 2025,

Contextual Support

Norfolk Island Plant Communities - Jerry Coleby-Williams

Preview of Mapping Australia's soil biodiversity - CSIRO, accessed August 5, 2025,

Mapping Australia's soil biodiversity - CSIRO, accessed August 5, 2025,

Contextual Support GreyLiterature

TERN Surveillance monitoring program: Soil vis-NIR spectral library with accompanying soil measurement data for 367 specimens - CSIRO Data Access Portal

Preview of Melioidosis in the Torres Strait Islands, Australia: Exquisite Interplay between Pathogen, Host, and Environment - PubMed Central, accessed August 4, 2025,

Melioidosis in the Torres Strait Islands, Australia: Exquisite Interplay between Pathogen, Host, and Environment - PubMed Central, accessed August 4, 2025,

Contextual Support Journal

Melioidosis in the Torres Strait Islands, Australia: Exquisite Interplay between Pathogen, Host, and Environment - PubMed Central, accessed August 4, 2025,

Preview of Microbial diversity declines in warmed tropical soil and respiration rise exceed predictions as communities adapt - PubMed, accessed August 4, 2025,

Microbial diversity declines in warmed tropical soil and respiration rise exceed predictions as communities adapt - PubMed, accessed August 4, 2025,

Contextual Support Journal

Microbial diversity declines in warmed tropical soil and respiration rise exceed predictions as communities adapt - PubMed, accessed August 4, 2025,

Preview of Protecting the Great Barrier Reef - DCCEEW, accessed August 4, 2025,

Protecting the Great Barrier Reef - DCCEEW, accessed August 4, 2025,

Contextual Support Government

Protecting the Great Barrier Reef - DCCEEW, accessed August 4, 2025,

Preview of Restoration of soil microbes and organic matter ... - UQ eSpace

Restoration of soil microbes and organic matter ... - UQ eSpace

Contextual Support Journal

Restoration of soil microbes and organic matter ... - UQ eSpace

Preview of Soil Nutrient Depletion Is Associated with the Presence of Burkholderia pseudomallei | Applied and Environmental Microbiology - ASM Journals, accessed August 4, 2025,

Soil Nutrient Depletion Is Associated with the Presence of Burkholderia pseudomallei | Applied and Environmental Microbiology - ASM Journals, accessed August 4, 2025,

Contextual Support Journal

Biogeography of Burkholderia pseudomallei in the Torres Strait Islands of Northern Australia, accessed August 4, 2025,

Preview of SOIL RESPIRATION RATES OF TROPICAL PEATLANDS IN MICRONESIA AND HAWAII - BioOne Complete, accessed August 4, 2025, )024[0051:SRROTP]2.0.CO;2.short

SOIL RESPIRATION RATES OF TROPICAL PEATLANDS IN MICRONESIA AND HAWAII - BioOne Complete, accessed August 4, 2025, )024[0051:SRROTP]2.0.CO;2.short

Contextual Support Journal

SOIL RESPIRATION RATES OF TROPICAL PEATLANDS IN MICRONESIA AND HAWAII - BioOne Complete, accessed August 4, 2025, )024[0051:SRROTP]2.0.CO;2.short

Preview of Soil Tech Note 17A- Soil Respiration - Natural Resources Conservation Service, accessed August 4, 2025,

Soil Tech Note 17A- Soil Respiration - Natural Resources Conservation Service, accessed August 4, 2025,

Contextual Support Government

Toiling in the soil – why we love microbes - GISERA, accessed August 4, 2025,

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

Preview of The most beautiful Australian islands - Tourism Australia, accessed August 2, 2025,

The most beautiful Australian islands - Tourism Australia, accessed August 2, 2025,

Contextual Support

The most beautiful Australian islands - Tourism Australia, accessed August 4, 2025,

Preview of These 21 Beautiful Tropical Islands Are Closer Than You Think | Travel Insider - Qantas, accessed August 3, 2025

These 21 Beautiful Tropical Islands Are Closer Than You Think | Travel Insider - Qantas, accessed August 3, 2025

Contextual Support

These 21 Beautiful Tropical Islands Are Closer Than You Think | Travel Insider - Qantas, accessed August 4, 2025,

Preview of Torres Strait Islands - Wikipedia, accessed July 27, 2025,

Torres Strait Islands - Wikipedia, accessed July 27, 2025,

Contextual Support GreyLiterature

Torres Strait Islands - Wikipedia, accessed August 4, 2025,

Context

Region Australia
Biome Tropical & Subtropical Maritime Islands
Land Use Conservation / Protected Natural Areas
Assessment Pristine Reference
Vegetation Forest
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 6 Jun 2026

Notes

The benchmark is a proxy value from the Australian Wet Tropics rainforest, representing the best available estimate for tropical island conservation areas. It sits within an optimal functional range with conceptual lower and upper thresholds indicating ecosystem stress and degradation respectively.