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Primary productivity varies across ecosystems and is influenced by factors such as sunlight, nutrient availability, and temperature.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Productivity - Primary Secondary GPP NPP
Gross primary productivity, or GPP, is the total rate at which primary producers capture energy and fix inorganic carbon before subtracting their own respiratory losses. In photosynthetic ecosystems, it is commonly expressed as carbon fixed per unit area per unit time and corresponds broadly to total photosynthesis at the ecosystem scale. Plants and algae use part of this fixed carbon in cellular respiration to power maintenance, ion transport, repair, and growth. The remainder is net primary productivity, so NPP equals GPP minus autotrophic respiration. NPP is the new producer biomass availab
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 17
An energy pyramid is upright because organisms at every trophic level respire a substantial part of assimilated chemical energy and dissipate it as heat. Additional production escapes consumption or is egested into the detrital pathway, so only a fraction becomes production at the next grazing level. Unlike atoms of nutrients, degraded heat cannot cycle back to producers as usable biological energy. Standardizing flux by area and time preserves this thermodynamic decline even where standing biomass pyramids are temporarily inverted. Ecological pyramids must be interpreted according to what is
Ref: Fundamentals of Ecology, Odum & Barrett, 5th Ed., Ch. 3
In simplified versions of Odum’s universal energy-flow model, S denotes energy stored as biomass or accumulated organic matter. Incoming assimilated energy is partitioned among respiration, production, storage, and exported or unassimilated pathways. Storage is a stock measured at a time, whereas production and respiration are rates over time. Recognizing that distinction prevents confusing standing biomass with productivity: a system may have a large S because biomass persists even when its current production rate is modest. Mass loss alone cannot identify mechanism, because leaching, fragmen
Ref: Fundamentals of Ecology, Odum & Barrett, 5th Ed., Ch. 3
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