Microbial Biomass Carbon (MBC)
Benchmark Value
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 7 benchmarks together — the OptimalRange form drives the primary score, while 6 guard(s) constrain the result.
Contributing Benchmarks
Evidence & Context
In the context of the Temperate Dry Woodlands & Native Grasslands biome, values consistently below 200-250 mg/kg MBC, especially when accompanied by a low MQ (<2-2.5%), likely signify a soil environment where biological functions are substantially limited.
Microbial Biomass Carbon (MBC) level below which soil ecological functions are significantly impaired.
Lower critical threshold for MBC indicating compromised soil biological function.
Values below this range are associated with compromised soil biological function and reduced nutrient cycling efficiency.
Sources (2)
Farming system impact on soil biology and functions
View SourceThe Long-Term Effect of Biochar on Soil Microbial Abundance, Activity and Community Structure Is Overwritten by Land Management - Frontiers
View SourceSupporting Sources (1)
Additional references from the underlying research that informed this benchmark.
Soil and fertilizer phosphorus: Effects on plant P supply and mycorrhizal development - Canadian Science Publishing, accessed August 28, 2025
View Source