Question

Describe the inter-relationship between productivity, gross primary productivity and net productivity. [3]

Answer 1

[1 mark for each point]
Productivity is the rate of biomass production per unit area over a period of time.

Gross Primary Productivity (GPP) is the rate of production of organic matter during photosynthesis in an ecosystem.

Net Productivity (NP) is the gross primary productivity minus respiratory (R) losses.

Then, NP = GPP - R