Gross primary production (GPP) is the total rate at which material is produced and net primary production (NPP) is the rate at which material is accumulated in excess of respiration. In other words, NPP is GPP minus respiration. ... Net primary production is directly related to ecosystem conditions.
What is net primary productivity NPP?
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. NPP = GPP - respiration.
What is the difference between gross primary productivity and net primary productivity quizlet?
What is the difference between net and gross primary production production? Net primary production is equal to gross primary production minus energy used by primary producers for respiration. Gross primary production is the amount of energy from light converted to chemical energy per unit of time.
What is the gross primary productivity GPP?
Gross primary productivity is the amount of carbon fixed during photosynthesis by all producers in the ecosystem. However, a large part of the harnessed energy is used up by the metabolic processes of the producers (respiration).
Why is NPP more useful than GPP?
Why is net primary production (NPP) a more useful measurement to an ecosystem ecologist than gross primary production (GPP)? ... NPP can be expressed in terms of carbon fixed by photosynthesis for an entire ecosystem. C) NPP represents the stored chemical energy that is available to consumers in the ecosystem.
What 3 ecosystems have the lowest productivity?
The highest net primary productivity in terrestrial environments occurs in swamps and marshes and tropical rainforests; the lowest occurs in deserts.
What increases net primary productivity?
Net primary productivity varies among ecosystems and depends on many factors. These include solar energy input, temperature and moisture levels, carbon dioxide levels, nutrient availability, and community interactions (e.g., grazing by herbivores) 2.
What is the difference between primary and secondary productivity?
The portion of fixed energy, a trophic level passes on to the next trophic level is called production. ... So, the primary productivity is the production of organic matter by the producers while secondary productivity is the production of the organic matter by the consumers.
What is the net primary productivity of an ecosystem quizlet?
Terms in this set (13)
Net primary productivity is the amount of energy lost through respiration by producers subtracted from the gross primary productivity of an ecosystem.
Why must predators in ecosystems with low NPP cover?
When a predator lives in a ecosystem that has a low NPP, it means that the predator will have to cover a much wider range in order to have all the needed energy that's produced by those primary producers.
What is GPP NPP equal to?
The overall productivity of a system can be found in an equation where the Net Primary Production, or NPP, is equal to the Gross Primary Production, or GPP, minus the Respiration, or R. The formula is the NPP = GPP - R. ... The GPP refers to the rate of energy stored by photosynthesis in plants.
How do you calculate gross primary productivity?
GPP can be calculated by measuring the decrease in DO when put in the dark (only respiration (R) will occur) • NPP = GPP – R so GPP = NPP + R Page 32 Experiments to Calculate Productivity (Light/Dark Rxns) • You start a light bottle/dark bottle measurement on algae Species X with 10 mg/L of oxygen in both bottles.
Where is GPP the highest?
The highest GPP values are in tropical regions (e.g. Amazonia, Central Africa and Southeast Asia) because of the wet and humid climate; and, the lowest GPP values are mainly in the arid regions of North Africa, West Asia and South America, as well as the cold and snow-covered regions (e.g. Greenland), due to the ...
ncG1vNJzZmidnmOxqrLFnqmbnaSssqa6jZympmeRp8Gqr8ueZp2hlpuys7HNnJyYmpWpxKaxzZieq6ejqKyxvsimmKuxj6W%2FsLDUnKuip56UtLG8vpqlnZeemsGgvNGipJqqqZS9s7vDrpqtoZ%2BjrK%2B8zw%3D%3D