It is the gross primary production - net primary production
There is a gross production of 4.2 are used and net production is 2.
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.
Net Income = Sales - Gross profit Gross Profit - Cost of Production = Net Income
Gross primary production consists of the amount of light energy that is converted to chemical energy by photosynthesis per unit of time. This chemical energy is going to two places-- respiration and growth of new biomass. Net primary production omits the energy used in respiration... just the energy going to new plant growth. Mathematically: (R = respiration) NPP = GPR - R
Gross Primary Productivity- Total amount of chemical energy stored by photosynthesis. Net Primary Productivity- Remaining energy, which is available to the consumers as food.
net
Gross primary production consists of the amount of light energy that is converted to chemical energy by photosynthesis per unit of time. This chemical energy is going to two places-- respiration and growth of new biomass. Net primary production omits the energy used in respiration... just the energy going to new plant growth. Mathematically: (R = respiration) NPP = GPR - R
by using light bottle and dark bottle method 1) Net primary production (NPP)= light -intial 2) Respiration=intial -dark 3)Gross Primary Production(GPP)=light -dark initial -oygen level in the experiment water body initially light -oxygen level in the light bottle after 1 day dark-oxygen level in the dark bottle after 1 day
net
GPP (gross primary production) minus cellular respiration.
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.