Work out net primary productivity instantly with clear inputs, formula shown and shareable results.
Subtracts autotrophic respiration from gross primary productivity to give net primary productivity, and scales it to the stated area.
Net primary productivity
NPP = GPP - autotrophic respiration; carbon across an area = NPP x area in m2 / 1000 for kilograms
Tropical rainforest reaches 1,000 to 2,000 gC/m2/yr; deserts and open ocean are below 100.
It subtracts heterotrophic respiration too, so it measures whether the ecosystem is a net carbon sink.