Although Maine has had an active biomass
market since the 1980s, harvesting biomass still represents a new product to many logging contractors in the region, and they may have to make significant investments and changes in their operations to engage in this market.
A soil high in organic material can have an active biomass
, which benefits soil health greatly.
However, where there is metabolically active biomass
outside the modules, the SA:B ratio decreases as extra-modular biomass increases volumetrically.
The substrate-induced respiration (SIR) method (Anderson and Domsch 1978) provides an index of potentially active biomass
, but must be calibrated for each soil to yield an actual quantity of microbial biomass.