Final answer:
The Net Primary Productivity (NPP) of a tropical rainforest ecosystem is calculated by subtracting the respiration rate (R) from the Gross Primary Productivity (GPP). With a GPP of 20,000 and R of 7,000, the NPP is 13,000 units of carbon per day.
Step-by-step explanation:
The Net Primary Productivity (NPP) of a tropical rainforest ecosystem can be calculated by subtracting the respiration rate (R) from the Gross Primary Productivity (GPP). Given that the GPP is 20,000 and the R is 7,000, we can determine the NPP using the following formula:
NPP = GPP - R
NPP = 20,000 - 7,000 = 13,000
Therefore, the NPP of the tropical rainforest ecosystem is 13,000 units of carbon per day, assuming that units given are consistent (e.g., grams of carbon per day).