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Net primary production is the rate at which all the autotrophs in an ecosystem produce net useful chemical energy. Net primary production is available to be directed toward growth and reproduction of primary producers. As such it is available for consumption by herbivores. [citation needed]
Terrestrial primary productivity refers to the organic matter production that takes place in terrestrial ecosystems such as forests, grasslands, and wetlands. Primary production is divided into Net Primary Production (NPP) and Gross Primary Production (GPP).
Net community production (NCP) is the difference between net primary production and respiration by animals and heterotrophs only. [3] Net community production is equal to net ecosystem production, and is only calculated differently. NCP = NPP - respiration [by animals and other heterotrophs]
Amounts of productivity are also dependent on the overall capacity of plants to capture sunlight which is directly correlated with plant leaf area and N content. Net primary productivity (NPP) is the primary measure of biomass accumulation within an ecosystem. Net primary productivity can be calculated by a simple formula where the total amount ...
The organisms responsible for primary production are called primary producers or autotrophs. Most marine primary production is generated by a diverse collection of marine microorganisms called algae and cyanobacteria. Together these form the principal primary producers at the base of the ocean food chain and produce half of the world's oxygen.
Both processes result from increased levels of atmospheric carbon dioxide (CO 2). [2][3] The carbon fertilization effect varies depending on plant species, air and soil temperature, and availability of water and nutrients. [4][5] Net primary productivity (NPP) might positively respond to the carbon fertilization effect. [6]
Stream metabolism, often referred to as aquatic ecosystem metabolism in both freshwater (lakes, rivers, wetlands, streams, reservoirs) and marine ecosystems, includes gross primary productivity (GPP) and ecosystem respiration (ER) and can be expressed as net ecosystem production (NEP = GPP - ER). Analogous to metabolism within an individual ...
Primary production can be broken down into gross and net primary production. Gross primary production is a measure of the energy that a photoautotroph harvests from the sun. Take, for example, a blade of grass that takes in x joules of energy from the sun. The fraction of that energy that is converted into glucose reflects the gross ...