2.2.13—Gross and net productivity
- Syllabus
- First assessment 2026
- Objective
- 2.2.13
- Level
- HL
Net Productivity Is What Remains After Respiration
Net productivity is gross productivity minus respiratory loss: NP = GP − R.
The remainder is new biomass available for growth, reproduction and potential harvest. Productivity is a rate, so keep area and time units.
GP 1,000 kJ m⁻² yr⁻¹ minus respiration 300 gives NP 700 kJ m⁻² yr⁻¹.
No; report area and time, such as 700 kJ m⁻² yr⁻¹.
Standing biomass is a store, not productivity, which is a rate.