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primary productivity
rate at which solar energy (sunlight) is converted into organic compounds via photosynthesis over a unit of time
photosynthesis
carbon dioxide+H2O+solar energy→glucose+oxygen
how sun gives energy to everything
cellular respiration
glucose+oxygen→CO2+water+energy
how we use energy from photosynthesis
gross primary productivity (GPP)
total rate of photosynthesis in a given area
-measured in energy per unit area per unit time (ex. kcal/m²/year)
net primary productivity (NPP)
rate of energy storage by photosynthesizes in a given area after subtracting energy lost to respiration (plant do photosynthesis and cellular respiration)
Net Primary Productivity (NPP)=
GPP (total made)- R (amount used for cell. resp.)