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- Photosynthetically_active_radiation abstract "Photosynthetically active radiation, often abbreviated PAR, designates the spectral range (wave band) of solar radiation from 400 to 700 nanometers that photosynthetic organisms are able to use in the process of photosynthesis. This spectral region corresponds more or less with the range of light visible to the human eye. Photons at shorter wavelengths tend to be so energetic that they can be damaging to cells and tissues, but are mostly filtered out by the ozone layer in the stratosphere. Photons at longer wavelengths do not carry enough energy to allow photosynthesis to take place.Other living organisms, such as green bacteria, purple bacteria and Heliobacteria, can exploit solar light in slightly extended spectral regions, such as the near-infrared. These bacteria live in environments such as the bottom of stagnant ponds, sediment and ocean depths. Because of their pigments, they form colorful mats of green, red and purple.Chlorophyll, the most abundant plant pigment, is most efficient in capturing red and blue light. Accessory pigments such as carotenes and xanthophylls harvest some green light and pass it on to the photosynthetic process, but enough of the green wavelengths are reflected to give leaves their characteristic color. An exception to the predominance of chlorophyll is autumn, when chlorophyll is degraded (because it contains N and Mg) but the accessory pigments are not (because they only contain C, H and O) and remain in the leaf producing red, yellow and orange leaves.PAR measurement is used in agriculture, forestry and oceanography. One of the requirements for productive farmland is adequate PAR, so PAR is used to evaluate agricultural investment potential. PAR sensors stationed at various levels of the forest canopy measure the pattern of PAR availability and utilization. Photosynthetic rate and related parameters can be measured non-destructively using a photosynthesis system, and these instruments measure PAR and sometimes control PAR at set intensities. PAR measurements are also used to calculate the euphotic depth in the ocean.".
- Photosynthetically_active_radiation thumbnail Par_action_spectrum.gif?width=300.
- Photosynthetically_active_radiation wikiPageExternalLink TechNote126.pdf.
- Photosynthetically_active_radiation wikiPageExternalLink what-is-par.
- Photosynthetically_active_radiation wikiPageExternalLink gov.html.
- Photosynthetically_active_radiation wikiPageID "1808258".
- Photosynthetically_active_radiation wikiPageLength "7275".
- Photosynthetically_active_radiation wikiPageOutDegree "37".
- Photosynthetically_active_radiation wikiPageRevisionID "677662574".
- Photosynthetically_active_radiation wikiPageWikiLink Accessory_pigment.
- Photosynthetically_active_radiation wikiPageWikiLink Avogadro_constant.
- Photosynthetically_active_radiation wikiPageWikiLink Carbon.
- Photosynthetically_active_radiation wikiPageWikiLink Carotene.
- Photosynthetically_active_radiation wikiPageWikiLink Category:Photosynthesis.
- Photosynthetically_active_radiation wikiPageWikiLink Chlorophyll.
- Photosynthetically_active_radiation wikiPageWikiLink Cyanobacteria.
- Photosynthetically_active_radiation wikiPageWikiLink Daily_light_integral.
- Photosynthetically_active_radiation wikiPageWikiLink Einstein_(unit).
- Photosynthetically_active_radiation wikiPageWikiLink Euphotic.
- Photosynthetically_active_radiation wikiPageWikiLink Heliobacteria.
- Photosynthetically_active_radiation wikiPageWikiLink Hydrogen.
- Photosynthetically_active_radiation wikiPageWikiLink Infrared.
- Photosynthetically_active_radiation wikiPageWikiLink Light.
- Photosynthetically_active_radiation wikiPageWikiLink Luminosity_function.
- Photosynthetically_active_radiation wikiPageWikiLink Luminous_efficacy.
- Photosynthetically_active_radiation wikiPageWikiLink Magnesium.
- Photosynthetically_active_radiation wikiPageWikiLink Metre.
- Photosynthetically_active_radiation wikiPageWikiLink Mole_(unit).
- Photosynthetically_active_radiation wikiPageWikiLink Nanometer.
- Photosynthetically_active_radiation wikiPageWikiLink Nanometre.
- Photosynthetically_active_radiation wikiPageWikiLink Near-infrared.
- Photosynthetically_active_radiation wikiPageWikiLink Nitrogen.
- Photosynthetically_active_radiation wikiPageWikiLink Organism.
- Photosynthetically_active_radiation wikiPageWikiLink Oxygen.
- Photosynthetically_active_radiation wikiPageWikiLink Ozone.
- Photosynthetically_active_radiation wikiPageWikiLink Photic_zone.
- Photosynthetically_active_radiation wikiPageWikiLink Photon.
- Photosynthetically_active_radiation wikiPageWikiLink Photons.
- Photosynthetically_active_radiation wikiPageWikiLink Photosynthesis.
- Photosynthetically_active_radiation wikiPageWikiLink Photosynthesis_system.
- Photosynthetically_active_radiation wikiPageWikiLink Photosynthetic_efficiency.
- Photosynthetically_active_radiation wikiPageWikiLink Pigment.
- Photosynthetically_active_radiation wikiPageWikiLink Pigments.
- Photosynthetically_active_radiation wikiPageWikiLink Plancks_law.
- Photosynthetically_active_radiation wikiPageWikiLink Purple_bacteria.
- Photosynthetically_active_radiation wikiPageWikiLink Second.
- Photosynthetically_active_radiation wikiPageWikiLink Stratosphere.
- Photosynthetically_active_radiation wikiPageWikiLink Xanthophyll.
- Photosynthetically_active_radiation wikiPageWikiLink File:Par_action_spectrum.gif.
- Photosynthetically_active_radiation wikiPageWikiLink File:Photosynthesis_yield_photon_flux_spectral_weighting.svg.
- Photosynthetically_active_radiation wikiPageWikiLinkText "PAR radiation".
- Photosynthetically_active_radiation wikiPageWikiLinkText "PAR".
- Photosynthetically_active_radiation wikiPageWikiLinkText "Photosynthetically Active Radiation".
- Photosynthetically_active_radiation wikiPageWikiLinkText "Photosynthetically active radiation".
- Photosynthetically_active_radiation wikiPageWikiLinkText "light levels".
- Photosynthetically_active_radiation wikiPageWikiLinkText "photosynthetically active radiation".
- Photosynthetically_active_radiation wikiPageWikiLinkText "photosynthetically active".
- Photosynthetically_active_radiation wikiPageWikiLinkText "would be equivalent".
- Photosynthetically_active_radiation hasPhotoCollection Photosynthetically_active_radiation.
- Photosynthetically_active_radiation wikiPageUsesTemplate Template:Cn.
- Photosynthetically_active_radiation subject Category:Photosynthesis.
- Photosynthetically_active_radiation comment "Photosynthetically active radiation, often abbreviated PAR, designates the spectral range (wave band) of solar radiation from 400 to 700 nanometers that photosynthetic organisms are able to use in the process of photosynthesis. This spectral region corresponds more or less with the range of light visible to the human eye. Photons at shorter wavelengths tend to be so energetic that they can be damaging to cells and tissues, but are mostly filtered out by the ozone layer in the stratosphere.".
- Photosynthetically_active_radiation label "Photosynthetically active radiation".
- Photosynthetically_active_radiation sameAs Photosynthetisch_aktive_Strahlung.
- Photosynthetically_active_radiation sameAs Radiación_Fotosintéticamente_Activa.
- Photosynthetically_active_radiation sameAs Fotosünteetiliselt_aktiivne_kiirgus.
- Photosynthetically_active_radiation sameAs Rayonnement_photosynthétiquement_actif.
- Photosynthetically_active_radiation sameAs Radiazione_fotosinteticamente_attiva.
- Photosynthetically_active_radiation sameAs Fotosynthetisch_actieve_straling.
- Photosynthetically_active_radiation sameAs Fotosyntetisk_aktiv_stråling.
- Photosynthetically_active_radiation sameAs Promieniowanie_czynne_fotosyntetycznie.
- Photosynthetically_active_radiation sameAs m.05ylj8.
- Photosynthetically_active_radiation sameAs Radiație_activă_fotosintetic.
- Photosynthetically_active_radiation sameAs Q900892.
- Photosynthetically_active_radiation sameAs Q900892.
- Photosynthetically_active_radiation wasDerivedFrom Photosynthetically_active_radiation?oldid=677662574.
- Photosynthetically_active_radiation depiction Par_action_spectrum.gif.
- Photosynthetically_active_radiation isPrimaryTopicOf Photosynthetically_active_radiation.