The amount of biomass produced by plants through photosynthesis minus respiration losses in a given time period is known as:

Net primary productivity is the biomass plants build by photosynthesis after subtracting their own respiration losses.

Gross primary productivity is the total energy fixed before any respiration is deducted, so it is larger.

Gross ecological productivity is not a standard term for this quantity.

Net secondary productivity refers to the biomass gained by consumers, not by plants.

Net primary productivity is the energy actually available to herbivores and higher trophic levels.

It is commonly measured as grams of dry matter fixed per unit area per unit time.