How to Calculate Net Primary Productivity
What is Net Primary Productivity?
Net Primary Productivity (NPP) is the rate at which plants produce organic matter through photosynthesis minus the carbon they use in their own respiration. NPP = GPP − Ra.
Step-by-Step Guide
- 1NPP = GPP − Ra (autotrophic respiration)
- 2In gC/m²/year or kcal/m²/year
Worked Examples
Input
Tropical rainforest GPP 7000 · Ra 3500
Result
NPP = 3,500 gC/m²/yr
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