Biomass
Definition and meaning of Biomass in chemistry.
Biomass is the total mass of living organisms or organic material in a specific area, ecosystem, or sample, typically expressed in grams per unit area or volume. It represents the accumulated dry weight of plant, animal, and microbial matter.
In more detail
Biomass is a key measurement in ecology that indicates the productivity and energy content of an ecosystem. It includes all living organisms across trophic levels, from microscopic bacteria to large animals, though plant biomass typically dominates terrestrial ecosystems. The term also applies to biological material used as a renewable energy source, including wood, agricultural residues, and algae. Measuring biomass at different ecological levels helps scientists understand energy flow through food chains and assess ecosystem health.
Key facts
| Field | Biochemistry |
|---|---|
| Common unit | grams per square meter (g/m²) or metric tons per hectare |
| Primary elemental composition | Organic carbon (C), hydrogen (H), oxygen (O), nitrogen (N) |
| Ecological hierarchy | Producers >> primary consumers > secondary consumers |
A temperate forest might have a total biomass of 200 metric tons per hectare, with trees comprising approximately 95% of that mass, while herbivores, carnivores, and decomposers constitute much smaller proportions.
Frequently asked questions
How does biomass differ from biodiversity?
Biomass measures the total mass of organisms in an area, while biodiversity measures the variety and number of species. An ecosystem can have high biomass with low biodiversity (few dominant species) or vice versa.
Why do scientists measure biomass?
Biomass measurements reveal ecosystem productivity, energy availability, and environmental health. They are essential for monitoring climate change impacts, managing natural resources, and assessing the sustainability of bioenergy production.