Accumulated net primary productivity.
Standing crop biomass tends to be more readily apparent in terrestrial environments versus aquatic environments and this is in part because terrestrial plants are so obviously a part of our landscape but also because foraging pressures on producers tends to be lower on land than in the sea. That is, there does not tend to be a large amount of bioamass accumulation in aquatic environments, though with the important exception of eutrophic bodies of water which can become clogged with algae or cyanobacteria blooms.
The difference between standing crop biomass and simply bioamass is a matter of accumulation (biomass) relative to total amounts of accumulation (standing crop biomass).
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