The total quantity or mass of organic material derived from living organisms
in a particular area, at a given time.
In the context of forests, it refers to both above-ground and below-ground,
and both living and dead organic materials, e.g., trees, crops, grasses, tree
litter, roots etc.
In the context of fisheries, it refers to the total weight of living organisms
or total weight of a fish resource or stock.
In the context of energy, the term biomass is also often used to refer to
organic materials, such as wood by-products and agricultural wastes, that can be
burned to produce energy or converted into a gas and used for fuel.
