What is net primary productivity and how is it calculated?



Net Primary Productivity (NPP), or the production of plant biomass, is equal to all of the carbon taken up by the vegetation through photosynthesis (called Gross Primary Production or GPP) minus the carbon that is lost to respiration.

How do you calculate net primary productivity?

NPP = GPP – R.

What is net primary productivity?

Definition. The amount of carbon retained in an ecosystem (increase in biomass); it is equal to the difference between the amount of carbon produced through photosynthesis (GPP) and the amount of energy that is used for respiration (R). Source.

What is net primary productivity quizlet?





net primary production. the available energy in the form of organic material that is available for transfer to the next level of the food chain. This is equal to the gross primary productivity of an organism minus the energy used by that organism. niche. the role an organism has in an ecosystem.

What units is NPP measured in?

Both gross and net primary production are typically expressed in units of mass per unit area per unit time interval. In terrestrial ecosystems, mass of carbon per unit area per year (g C m2 yr1) is most often used as the unit of measurement.

Why is NPP important?

Why is NPP important? NPP is a measure of plant growth. It provides highly synthesized, quantitative information for sustainable resource management.

What does NPP mean in biology?

net primary productivity





The difference between GPP and R is known as net primary productivity (NPP) and represents the actual rate of production of new biomass …’.

What is an example of net primary productivity?

Plants capture and store solar energy through photosynthesis. During photosynthesis, living plants convert carbon dioxide in the air into sugar molecules they use for food. In the process of making their own food, plants also provide the oxygen we need to breathe.

What is primary productivity in simple terms?

Primary productivity refers to the degree to which autotrophic organisms (primarily plants and algae) convert energy into organic substances through photosynthesis or chemosynthesis. Since the process of photosynthesis consumes carbon dioxide and produces oxygen, it is of great importance to the environment.

What is primary productivity example?

Primary productivity is the process where inorganic substances are synthesized by organisms to produce simple organic materials. Primary producers, or autotrophs, are responsible for this phenomenon. Common examples of primary producers include diatoms, dinoflagellates, and coccolithophores.

What is NPP short answer?

Net primary production (NPP) is strictly defined as the difference between the energy fixed by autotrophs and their respiration, and it is most commonly equated to increments in biomass per unit of land surface and time.



What factors affect NPP?

In addition to solar radiation, the main abiotic factors that affect rates of photosynthesis and NPP are water, temperature, carbon dioxide concentration, and nutrients.

What does NPP depend on?


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What is an example of net primary productivity?

Plants capture and store solar energy through photosynthesis. During photosynthesis, living plants convert carbon dioxide in the air into sugar molecules they use for food. In the process of making their own food, plants also provide the oxygen we need to breathe.

What is the formula for net primary production at each trophic level?

Net Primary Production (NPP) = GPP – RA The amount of organic carbon produced by plants that is not consumed by their own respiration. It is the increase in the plant biomass in the absence of herbivores.

How is primary productivity usually measured?

Primary productivity is usually determined by measuring the uptake of carbon dioxide or the output of oxygen. Production rates are usually expressed as grams of organic carbon per unit area per unit time.



How do you calculate net secondary productivity?

Net secondary productivity(NSP): The gain by consumers in energy or biomass per unit area per unit time remaining after allowing for respiratory losses.



Secondary productivity:

  1. NSP = GSP – R.
  2. GSP = food eaten – faecal loss.
  3. where R = respiratory loss.