the ratio of all biomass accumulation and biomass losses in units of carbon, weight or energy, per land surface unit, over a set time interval (usually a year)
Rate at which all the plants in an ecosystem produce net useful chemical energy; equal to the difference between the rate at which the plants in an ecosystem produce useful chemical energy (gross primary productivity) and the rate at which they use some of that energy through cellular respiration. Compare gross primary productivity.
Gross primary productivity (the total amount of energy that plants produce) minus the energy plants use during cellular respiration.
depends on the rates of photosynthesis (producing carbohydrates) and respiration (consuming carbohydrates) and is the amount of organic matter produced overall at the autotroph level
Total primary production, minus the amount consumed in respiration.
The rate at which producer (usually plants) biomass is created in a community.
The part of gross primary production that remains stored in the producer organism (primarily green plants) after deducting the amount used during the process of respiration.
The Net Primary Productivity (NPP) of an ecosystem is the rate at which it accumulates energy or biomass, excluding the energy it uses for the process of respiration. This typically corresponds to the rate of photosynthesis, minus respiration by the photosynthesizers.
