Microbial Biomass Carbon (MBC)

AUS-TMS-AGR-SMB General Moderate confidence

Benchmark Value

286.6 mg/kg
Direction: Higher is desirable ↑
Form: Point

Scoring Curve

Scoring curve unavailable

The scoring engine could not generate a curve for this benchmark context. The primary form is Point, but the benchmark data may be missing required fields (e.g., optimal range bounds for an OptimalRange benchmark). This is typically a data quality issue in the benchmark pipeline.

Contributing Benchmarks

Point Primary Point Guard

Evidence & Context

Based on the available information and the imperative to identify a "best-on-offer" real-world state demonstrating high environmental health under sustainable or regenerative management, the value from the Indian PCM system is proposed as a proxy benchmark.

Metric Definition:

Microbial Biomass Carbon (MBC) represents the carbon contained within the living cells of microorganisms in the soil, primarily bacteria, fungi, and archaea.

Benchmark Definition:

This benchmark represents the carbon content within living soil microorganisms in tropical monsoonal savanna agricultural crop production systems, indicating a high environmental health state under sustainable or regenerative management.

Justification:

This value is derived from a peer-reviewed (preprint status) study of a perennial, multi-species cropping system (PCM) in a tropical, seasonally dry, drought-prone region. The PCM system's design and objectives closely align with criteria for high environmental health and sustainable or regenerative land management.

Sources (1)

Preview of Impact of Cropping Systems on Macronutrient Distribution and Microbial Biomass in Drought Affected Soils
Impact of Cropping Systems on Macronutrient Distribution and Microbial Biomass in Drought Affected Soils
View Source

Supporting Sources (16)

Additional references from the underlying research that informed this benchmark.

Preview of A review on effective soil health bio-indicators for ecosystem restoration and sustainability, accessed on June 7, 2025
A review on effective soil health bio-indicators for ecosystem restoration and sustainability, accessed on June 7, 2025
Contextual Support Journal

A review on effective soil health bio-indicators for ecosystem restoration and sustainability, accessed on June 7, 2025

View Source
Preview of Cover crops reduce soil resistance to penetration by preserving soil surface water content | Request PDF - ResearchGate, accessed on June 7, 2025
Cover crops reduce soil resistance to penetration by preserving soil surface water content | Request PDF - ResearchGate, accessed on June 7, 2025
Contextual Support Journal

Cover crops reduce soil resistance to penetration by preserving soil surface water content | Request PDF - ResearchGate, accessed on June 7, 2025

View Source
Preview of EFFECTS OF AGRICULTURAL MANAGEMENT ON SOIL CARBON ..., accessed on June 7, 2025
EFFECTS OF AGRICULTURAL MANAGEMENT ON SOIL CARBON ..., accessed on June 7, 2025
Contextual Support Journal

Biogeographical patterns of the soil fungal:bacterial ratio across France - PubMed Central

View Source
Preview of Effects of agricultural management on soil carbon and pH in the Douglas Daly region of the Northern Territory - NT (Book), accessed on June 7, 2025
Effects of agricultural management on soil carbon and pH in the Douglas Daly region of the Northern Territory - NT (Book), accessed on June 7, 2025
Contextual Support Journal

General soil science literature and expert synthesis

View Source
Preview of Grazing-management-for-soil-carbon-in-Australia-A-review.pdf - University of Tasmania, accessed on June 7, 2025
Grazing-management-for-soil-carbon-in-Australia-A-review.pdf - University of Tasmania, accessed on June 7, 2025
Contextual Support

Grazing-management-for-soil-carbon-in-Australia-A-review.pdf - University of Tasmania, accessed on June 7, 2025

View Source
Preview of Impact of Cropping Systems on Macronutrient Distribution and ..., accessed on June 7, 2025
Impact of Cropping Systems on Macronutrient Distribution and ..., accessed on June 7, 2025
Direct Evidence

Impact of Cropping Systems on Macronutrient Distribution and ..., accessed on June 7, 2025

View Source
Preview of Impacts of long-term tillage and fertilization on soil carbon stock and aggregate stability in tropical agriculture - Bohrium, accessed on June 7, 2025
Impacts of long-term tillage and fertilization on soil carbon stock and aggregate stability in tropical agriculture - Bohrium, accessed on June 7, 2025
Contextual Support Journal

Impacts of long-term tillage and fertilization on soil carbon stock and aggregate stability in tropical agriculture - Bohrium, accessed on June 7, 2025

View Source
Preview of Interpreting Microbial Biomass Carbon | Fact Sheets | soilquality.org.au, accessed August 28, 2025,
Interpreting Microbial Biomass Carbon | Fact Sheets | soilquality.org.au, accessed August 28, 2025,
Contextual Support GreyLiterature

Interpreting Microbial Biomass Carbon | Fact Sheets | soilquality.org.au

View Source
Preview of Liu, X. et al. (2023). Fire regime has a greater impact on soil microbial abundance than on soil organic carbon in a tropical savanna. Wildlife Research.
Liu, X. et al. (2023). Fire regime has a greater impact on soil microbial abundance than on soil organic carbon in a tropical savanna. Wildlife Research.
Contextual Support

Short‐term impact of fire on the total soil microbial and nitrifier communities in a wet savanna

View Source
Preview of Microbiological Indicators for Assessing the Effects of Agricultural Practices on Soil Health: A Review - MDPI, accessed on June 5, 2025
Microbiological Indicators for Assessing the Effects of Agricultural Practices on Soil Health: A Review - MDPI, accessed on June 5, 2025
Contextual Support Journal

Unraveling the Importance of Forest Structure and Composition Driving Soil Microbial and Enzymatic Responses in the Subtropical Forest Soils - MDPI

View Source
Preview of Relationship of Microbial and Fertility Attributes to Organic Carbon Accumulation in a Subtropical Weathered Soil Impacted by a - Agritrop, accessed on June 7, 2025
Relationship of Microbial and Fertility Attributes to Organic Carbon Accumulation in a Subtropical Weathered Soil Impacted by a - Agritrop, accessed on June 7, 2025
Contextual Support Journal

Relationship of Microbial and Fertility Attributes to Organic Carbon Accumulation in a Subtropical Weathered Soil Impacted by a - Agritrop, accessed on June 7, 2025

View Source
Preview of ResearchOnline@JCU - James Cook University, accessed on June 7, 2025
ResearchOnline@JCU - James Cook University, accessed on June 7, 2025
Contextual Support Journal

Variation in soil microbial biomass in the dry tropics: impact of land-use change

View Source
Preview of Role of Soil Microbiota Enzymes in Soil Health and Activity Changes Depending on Climate Change and the Type of Soil Ecosystem, accessed on June 7, 2025
Role of Soil Microbiota Enzymes in Soil Health and Activity Changes Depending on Climate Change and the Type of Soil Ecosystem, accessed on June 7, 2025
Contextual Support Journal

Role of Soil Microbiota Enzymes in Soil Health and Activity Changes Depending on Climate Change and the Type of Soil Ecosystem, accessed on June 7, 2025

View Source
Preview of Soil microbial biomass—what do the numbers really mean? - ResearchGate, accessed August 28, 2025,
Soil microbial biomass—what do the numbers really mean? - ResearchGate, accessed August 28, 2025,
Contextual Support GreyLiterature

Responses of soil labile organic carbon stocks and the carbon pool management index to different vegetation restoration types in the Danxia landform region of southwest China - PMC - PubMed Central

View Source
Preview of Soil organic matter pools in a tropical savanna under agroforestry system in Northeastern Brazil - SciELO, accessed on June 7, 2025
Soil organic matter pools in a tropical savanna under agroforestry system in Northeastern Brazil - SciELO, accessed on June 7, 2025
Contextual Support Journal

Soil organic matter pools in a tropical savanna under agroforestry system in Northeastern Brazil - SciELO, accessed on June 7, 2025

View Source
Preview of Variation in soil microbial biomass in the dry tropics: impact of land-use change, accessed on June 7, 2025,
Variation in soil microbial biomass in the dry tropics: impact of land-use change, accessed on June 7, 2025,
Contextual Support Journal

Soil microbial biomass during the early establishment of hoop pine ...

View Source

Context

  • Region Australia
  • Biome Tropical Monsoonal Savannas
  • Land Use Agricultural Crop Production
  • Assessment Conservation Target
  • Season monsoon season
  • Evidence Type ReferenceCondition

Lifecycle

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

Notes

No specific numerical lower critical threshold is defined; higher MBC values are generally beneficial up to natural saturation points determined by soil type, climate, and organic inputs. While very high microbial biomass may increase phytopathogen risks, benefits generally plateau rather than decline.