Primary Productivity & Trophic Levels (1.8 & 1.9)

A forest ecosystem has a GPP of 2,500 kcal/m²/year, and the producers use 1,800 kcal/m²/year for respiration.

A grassland has a measured NPP of 900 kcal/m²/year, and producers respire 600 kcal/m²/year.

In a wetland, the GPP is 3,200 kcal/m²/year, and the NPP is 1,900 kcal/m²/year.

An ecosystem has a GPP of 5,000 kcal/m²/year and an NPP of 2,000 kcal/m²/year.
What percentage of GPP is used in respiration?

A tropical rainforest has a GPP of 6,800 kcal/m²/year, and the plants use 2,400 kcal/m²/year for respiration.

An agricultural field has an NPP of 1,500 kcal/m²/year, and plant respiration accounts for 900 kcal/m²/year.

A desert ecosystem has a GPP of 1,200 kcal/m²/year and an NPP of 300 kcal/m²/year.