## What is the definition of productivity in biology?

Definition of Biological productivity: The quantity of organic matter or its equivalent in dry matter, carbon, or energy content which is accumulated during a given period of time.

What is GPP NPP and R?

You can see that your bank account balance is determined as follows: Your Net production is equal to your Gross Production minus Respiration, which is the same as the equation above that states the Net Primary Production (NPP) = the Gross Primary Production (GPP) minus Respiration (R).

What is high net primary productivity?

Net primary productivity, or NPP, is gross primary productivity minus the rate of energy loss to metabolism and maintenance. In other words, it’s the rate at which energy is stored as biomass by plants or other primary producers and made available to the consumers in the ecosystem.

### What is productivity AP environmental science?

1.8 Primary Productivity The amount of energy in an ecosystem determines how much energy an ecosystem can support. The amount of energy that the producers in an ecosystem capture is called the gross primary productivity (GPP).

What are the different types of productivity in an ecosystem?

According to Odum there are three types of productivities – primary productivity, secondary productivity and community productivity.

How do you calculate NPP and GPP?

To calculate NPP, you take the total amount of carbon that the plant ​fixes​ (or turns into usable material) and subtract the amount of carbon lost during respiration. The total amount of carbon taken in by the plant is known as the ​gross primary productivity​ (GPP), and the amount of respiration is known as ​Ra​.

## What does a negative NPP mean?

Net primary production (NPP) A negative value means decomposition or respiration overpowered carbon absorption; more carbon was released to the atmosphere than the plants took in.

How do you measure NPP?

What is primary productivity AP Bio?

primary productivity, in ecology, the rate at which energy is converted to organic substances by photosynthetic producers (photoautotrophs), which obtain energy and nutrients by harnessing sunlight, and chemosynthetic producers (chemoautotrophs), which obtain chemical energy through oxidation.

### What does GPP stand for apes?

gross primary production (GPP) the rate at which chemical energy is stored in plants: 1% of available sunlight between 20-50% of the GPP is used by the plant in respiration process. Primary productivity is the rate at which energy is converted by photosynthetic and chemosynthetic autotrophs to organic substances.