Question

Net communty productivity

Answer 1

net community productivity is used to measure primary production and community productivity

Answer 2

Gross Primary Productivity (GPP):

This refers to the total amount of organic matter produced. This also includes what is used by the producer in respiration. This can also be defined as total energy captured by the photosynthetic organism. This will depend on the photosynthetic capacity of the producer and environ­mental factors. Mean net primary production is high in tropical rain forest while it is the lowest in deserts.

Net Primary Productivity (NPP):

The productivity refers to the gross production minus the loss by respiration and decomposition. This is also called as apparent photosynthesis or net assimilation.

NPP = GPP – Respiration

It can also be defined as the balance energy or biomass remaining after meeting the cost of respiration of producers. It is the net stored energy in the green plants. This is the net accumulation of biomass which serves as food for herbivores and decomposers. NPP is said to be a measure of amount of organic matter produced in a community in a given time available to the heterotrophs.