Ecology

Biomass

The total mass of living organisms in a given area or ecosystem, typically expressed as dry weight per unit area. A measure of the amount of living material present.

Used in the Books

This term appears in 17 chapters:

Foundations Ecosystem Thinking

"...seral species (intermediate community members) require the soil and nutrients that pioneers created but offer shade, deeper root systems, and more biomass. Seral species outcompete pioneers as conditions improve. Year 10+: Larger trees establish. The ecosystem approaches a climax community*: a stabl..."

Growth Stages Root Systems

"(1997). "Net transfer of carbon between ectomycorrhizal tree species in the field." Nature 388: 579-582 - Poorter, H., et al. (2012). "Biomass allocation to leaves, stems and roots." Global Change Biology 18: 1350-1364 - Wang, B. & Qiu, Y.L. (2006)."

Growth Stages Flowering and Reproduction

"...flowering. Photoperiodism: Day Length Sensing A soybean planted in June will wait. And wait. All summer, it grows leaves, extends roots, builds biomass - but refuses to flower. Then in August, when night length crosses ten hours, something clicks. Within two weeks, flowers appear."

Growth Stages Forest Succession

"...rs, goldenrods) - Small shrubs (brambles, low berries) These plants: - Grow faster than pioneers (annual to perennial, not centuries) - Produce more biomass (creating thicker soil through leaf litter, root death) - Trap seeds from nearby ecosystems (wind-blown, bird-dropped) - Add organic matter: 5-10 cm ..."

Growth Stages Regeneration

"...l fertility 2-5× higher than pre-fire - Regenerating plants access nutrient pulse, grow rapidly 4. Reduced competition - Fire kills above-ground biomass of all plants (levels playing field) - Fire-adapted species (with sprouting or fire-triggered seeds) have advantage - They colonize before non-fire-a..."

And 12 more chapters...

Biological Context

Biomass decreases at higher trophic levels—there's more plant biomass than herbivore biomass than carnivore biomass. This pyramid reflects energy loss at each transfer. Forest biomass stores carbon; changes in biomass affect global carbon cycles and climate.

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