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Gross primary production (GPP) is the rate at which an ecosystem's producers capture and store a given amount of chemical energy as biomass in a given length of time. Some fraction of this fixed energy is used by primary producers for cellular respiration and maintenance of existing tissues (i.e., "growth respiration" and "maintenance respiration").[1] The remaining fixed energy (i.e., mass of photosynthate) is referred to as net primary production (NPP).NPP = GPP - respiration [by plants]
Net primary production is the rate at which all the plants in an ecosystem produce net useful chemical energy; it is equal to the difference between the rate at which the plants in an ecosystem produce useful chemical energy (GPP) and the rate at which they use some of that energy during respiration. Some net primary production goes toward growth and reproduction of primary producers, while some is consumed by herbivores.
Both gross and net primary production are in units of mass / area / time. In terrestrial ecosystems, mass of carbon per unit area per year (g C/m2/yr) is most often used as the unit of measurement.
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How do you calculate NPP?
GPP (gross primary production) minus cellular respiration.
Does temperature change affect GPP and NPP?
Yes, temperature can affect both Gross Primary Productivity (GPP) and Net Primary Productivity (NPP) of ecosystems. Generally, GPP tends to increase with temperature up to a certain point where it may plateau or decline due to heat stress. NPP, which represents the amount of energy that is available for the growth and reproduction of plants, is influenced by temperature through its effect on metabolic processes and nutrient availability.
What is Gross primary production?
The rate at which an ecosystems producers covert solar energy into chemical energy (in the form of biomass). To Solve : GPP = NPP + R (R - Respiration)
What it the formula for net primary production at each trophic level?
The formula for net primary production at each trophic level is: Net Primary Production (NPP) = Gross Primary Production (GPP) - Respiration by Autotrophs. GPP is the total amount of energy captured by producers through photosynthesis, while respiration by autotrophs is the amount of energy that producers use for their own metabolic processes. NPP represents the energy available for consumption by organisms in the next trophic level.
Why is an ecosystem's net primary production (NPP) lower than its gross primary production (GPP)?
Net primary production (NPP) is lower than gross primary production (GPP) because not all of the energy captured through photosynthesis is available for growth and reproduction. Some of the energy is used by plants for their own metabolic processes, such as respiration. Additionally, a portion of the energy is lost as heat during these metabolic processes. Therefore, NPP represents the amount of energy available for consumption by herbivores and higher trophic levels.
How is lai related to npp and gpp?
Both are vegetation variables. LAI determines the the amount of m2 leaves per m2 whereas GPP is gross production meaning new vegetation produces (plus respiration). In this way there is logically a relationship. On the other hand you can have a plant with a big LAI that is actually very low producing or you can have a plant with a little LAI that is very productive. It all depends on the species...
Is general professional partnership subject to withholding tax?
the GPP itself are exempt for withholding tax but if the income payment are payable direct to the members of the GPP then it is subject to withholdinbg tax.. The GPP is not a taxable entity because its member are taxable individually, so the gpp are exempt from withholding..
Is an ecosystem with a high NPP better than one with a low NPP?
I believe a ecosystem with a high NPP would be better than one with a low NPP because than plants produce use full energy, but I am not positive if that is correct.
What is GPP?
a gpp is a general purpose package for instance ... Word processing, Spreadsheets, Power points,Databases and graphic packages.
What does npp mean in text talk?
no problem
How does piping materials for Npp selected?
Piping materials for Nuclear Power Plants, sometimes abbreviated NPP, are chosen based on many factors, including durability. The U.S. Nuclear Regulatory Committee also publishes information, aiding NPP in their choice.
What is gross production?
The rate at which an ecosystems producers covert solar energy into chemical energy (in the form of biomass). To Solve : GPP = NPP + R (R - Respiration)
