Question

Which of the following relations is correct regarding GPP and NPP of an ecosystem
a. NPP = GPP — Animal consumption
b. NPP = GPP + Plant respiration
c. NPP = GPP — Plant respiration
d. NPP = GPP + Animal consumption

Answer 1

Hint: The quantitative relation of NPP to GPP, or carbon use potency, is that the fraction of carbon absorbed by a system that's allotted to plant biomass production.

Complete answer
Let’s discuss given options and find the correct answer:

>While gross primary production (GPP) is the total influx of carbon into an ecosystem through the photosynthetic fixation of CO2, net primary production (NPP) is this gross carbon influx discounted for plant respiratory costs of growth and maintenance.
>Gross primary productivity is the rate of biomass production by producers, whereas web primary productivity is the remaining fraction of biomass created once accounting for energy lost because of metabolism and maintenance of plant parts.
>Gross primary productivity is the rate of production of organic matter during photosynthesis and its considerable amount is utilized by plants during respiration.Thus Net Primary Productivity is gross primary productivity minus plant respiration.NPP=GPP-Plant respiration (R)
>The overall productivity of a system is often found in associate equations wherever information superhighway Primary Production, or NPP, is capable of Gross Primary Production, or GPP, minus the Respiration, or R. The formula is that the NPP = GPP - R. The NPP is the overall potency of the plants within the scheme.

Hence option ‘c’ NPP=GPP-Plant respiration is the correct answer.

Note:The total standing biomass of the associate degree system could be an operation of accumulative NPP over time minus biomass losses from senescence (i.e., death).