energy transfer

Cards (6)

  • biomass:
    • total mass of a living material in a given area at a given time
  • measuring dry mass:
    • dry sample in an oven (heated)
    • weighed at regular intervals until mass is constant
    • shows that all the water has evaporated
  • GPP: gross primary production
    • total amount of chemical energy in the plant biomass
  • NPP: net primary production
    • chemical energy in plant biomass taking into account the loss from respiration
  • equation for NPP
    NPP = GPP - R
  • equation for NPP for consumers : 
    N = I - F + R
    I: ingested food
    F: faeces + urine
    R: respiration