Primary production is the production of organic compounds from atmospheric or aquatic carbon dioxide, mainly through the process of photosynthesis. The organisms which are responsible for primary production are known as primary producers or autotrophs and form the base of the food chain. In terrestrial ecoregions, these are mainly plants, while in aquatic ecoregions algae are primarily responsible. Primary production is the production of chemical energy in organic compounds by living organisms. The main source of this energy is sunlight, but a minute fraction of primary production is driven by lithotrophic organisms using the chemical energy of inorganic molecules. The energy is used to synthesise complex organic molecules from simpler inorganic compounds regardless of source such as carbon dioxide (CO2) and water (H2O). 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. On the land, almost all primary production is now performed by vascular plants, with a small fraction coming from algae and nonvascular plants such as mosses and liverworts. It is known that some organisms are capable of synthesising organic molecules from inorganic precursors and of storing biochemical energy in the process. These are called autotrophs, meaning ‘self-feeding’. Autotrophs also are referred to as primary producers. Organisms able to manufacture complex organic molecules from simple inorganic compounds (water, CO2, nutrients) include plants, some protists and some bacteria. The process by which they do this usually is photosynthesis, and as its name implies, photosynthesis requires light. There are two general approaches by which primary production can be measured: one can measure either (a) the rate of photosynthesis or (b) the rate of increase in plant biomass. Without autotrophs, there would be no energy available to all other organisms that lack the capability of fixing light energy. However, the continual loss of energy due to metabolic activity puts limits on how much energy is available to higher trophic levels. All of the animal species on Earth are consumers, and they depend upon producer organisms for their food. For all practical purposes, it is the products of terrestrial plant productivity that sustain humans. A pyramid of biomass is a representation of the amount of energy contained in biomass, at different trophic levels for a given point in time. Pyramid of numbers represents the number of organisms in each trophic level.
Trophic Level Mixed Layer Gross Primary Production High Trophic Level Basal Area Increment
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Amthor JS, Baldocchi DD (2001) Terrestrial higher plant respiration and net primary production. In: Roy J, Saugier B, Mooney HA (eds) Terrestrial global productivity. Academic, San Diego, pp 33–59CrossRefGoogle Scholar
Bender M et al (1987) A comparison of 4 methods for determining planktonic community production. Limnol Oceanogr 32(5):1085–1098CrossRefGoogle Scholar
Clark DA, Brown S, Kicklighter DW, Chambers JQ, Thomlinson JR, Ni J (2001) Measuring net primary production in forests: concepts and field methods. Ecol Appl 11:356–370CrossRefGoogle Scholar
Cooper DJ, Watson AJ, Nightingale PD (1996) Large decrease in ocean—surface CO2 fugacity in response to in situ iron fertilization. Nature 383(6600):511–513CrossRefGoogle Scholar
Field CB, Behrenfeld MJ, Randerson JT, Falkowski P (1998) Primary production of the biosphere: integrating terrestrial and oceanic components. Science 281(5374):237–240CrossRefGoogle Scholar
Foley JA, Monfreda C, Ramankutty N, Zaks D (2007) Our share of the planetary pie. Proc Natl Acad Sci USA 104(31):12585–12586CrossRefGoogle Scholar
Haberl H, Erb KH, Krausmann F, Gaube V, Bondeau A, Plutzar C, Gingrich S, Lucht W, Fischer-Kowalski M (2007) Quantifying and mapping the human appropriation of net primary production in earth’s terrestrial ecosystems. Proc Natl Acad Sci USA 104(31):12942–12947CrossRefGoogle Scholar
Luz B, Barkan E (2000) Assessment of oceanic productivity with the triple-isotope composition of dissolved oxygen. Science 288(5473):2028–2031CrossRefGoogle Scholar
Marra J (2002) Approaches to the measurement of plankton production. In: Williams PJlB, Thomas DN, Reynolds CS (eds) Phytoplankton productivity: carbon assimilation in marine and freshwater ecosystems. Blackwell, Oxford, pp 78–108CrossRefGoogle Scholar
Martin JH, Fitzwater SE (1988) Iron-deficiency limits phytoplankton growth in the Northeast Pacific Subarctic. Nature 331(6154):341–343CrossRefGoogle Scholar
Ramankutty N, Evan AT, Monfreda C, Foley JA (2008) Farming the planet: 1. Geographic distribution of global agricultural lands in the year 2000. Global Biogeochem Cycles 22:GB1003CrossRefGoogle Scholar
Schäfer G, Engelhard M, Müller V (1999) Bioenergetics of the Archaea. Microbiol Mol Biol Rev 63(3):570–620Google Scholar
Scurlock JMO, Johnson K, Olson RJ (2002) Estimating net primary productivity from grassland biomass dynamics measurements. Glob Chang Biol 8(8):736–753CrossRefGoogle Scholar
Steeman-Nielsen E (1951) Measurement of production of organic matter in sea by means of carbon-14. Nature 267(4252):684–685CrossRefGoogle Scholar
Steeman-Nielsen E (1952) The use of radioactive carbon (C14) for measuring organic production in the sea. J Cons Int Explor Mer 18:117–140Google Scholar
Vitousek PM, Ehrlich PR, Ehrlich AH, Matson PA (1986) Human appropriation of the products of photosynthesis. Bioscience 36(6):368–373CrossRefGoogle Scholar