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 5 benchmarks together — the OptimalRange form drives the primary score, while 4 guard(s) constrain the result.
Contributing Benchmarks
Evidence & Context
Based on the evidence, an optimal range for MBC in best-practice production forestry within Australia's tropical and subtropical rainforest biome is proposed as approximately 650 to 950 mg/kg. The lower bound (~650 mg/kg) is anchored by the benchmark value of 686 mg/kg from the mature, stable 1R plantation, representing a proven, sustainable, and high-functioning managed state. The upper bound (~950 mg/kg) is defined by the value from the adjacent native forest, representing the attainable natural potential for the ecosystem.
Optimal functional range of Microbial Biomass Carbon (MBC) in the 0–10 cm soil layer for maintaining long-term forest health and productivity
Range representing high ecological health and sustainable production forestry management.
Synthesized from benchmark and natural potential values, representing a functional range for maintaining ecological integrity.
Sources (1)
Soil carbon and nutrient pools, microbial properties and gross nitrogen transformations in adjacent natural forest and hoop pine plantations of subtropical Australia
View SourceSupporting Sources (4)
Additional references from the underlying research that informed this benchmark.
Selective logging impacts on soil microbial communities and functioning in Bornean tropical forest - Frontiers
View SourceFOREST CARBON MARKETS - Forestry Australia, accessed July 21, 2025
View Source
Sugarcane cultivation altered soil nitrogen cycling microbial processes and decreased nitrogen bioavailability in tropical Australia - ResearchOnline@JCU, accessed July 29, 2025
View SourceSoil microbial biomass during the early establishment of hoop pine ...
View Source