Skov

Denne artikel handler om plantesamfundet eller biotopen "en skov". For alternative betydninger se Skov (flertydig).

Verdens biomer, fordelt efter klimabælterne

Taiga (nåleskov) Løvskove Tempereret regnskov Mediterrane biomer Monsunskove Bjergskove Skovsavanner Subtropiske tørkeskove Tropiske regnskove

En skov er et plantesamfund eller en biotop, hvori træer udgør hovedbestanddelen. Endvidere må det kræves, at der er tale om et større areal, minimum 0,5 hektar og en minimumsbredde på 20 meter med træer højere end 5 meter og at trækronerne dækker mere end 10 %.^[1] Skov forekommer naturligt overalt på Jorden, bortset fra områder med for lav temperatur eller for tørt klima. Klimaet er afgørende for, hvilken skovtype, der udvikles.

Skoven producerer bioaerosoler og påvirker skydannelse, tågedannelse og nedbøren væsentligt – og dermed både vejret og klimaet. ^[2]^[3]^[4]^[5]

En mindre skov kaldes for en lund.

I overført betydning bruges ordet "skov" også til at angive en større samling af ensartede individer eller emner f.eks. en skov af biler eller mennesker.

^ Skovstatistik 2018 (Webside ikke længere tilgængelig) Thomas Nord-Larsen, Vivian Kvist Johannsen, Torben Riis-Nielsen, Iben Margrete Thomsen og Bruno Bilde Jørgensen (2019). Institut for Geovidenskab og Naturforvaltning, Københavns Universitet, Frederiksberg. 40 s. ill. ISBN 978-87-7903-813-4 (web)
^ Penn State. (2004, May 6). Missing Chemical Important To Air Pollution Estimates. ScienceDaily Citat: "..."We think we measured all major components of the hydroxyl radical reactants, but there is something still unaccounted for,” says Brune. "We know that something we cannot identify is reacting with the hydroxyl radicals and we know it is temperature dependent and not light dependent. We just do not know what it is."..."
^ California Institute of Technology (2009, August 7). Organic Carbon Compounds Emitted By Trees Affect Air Quality. ScienceDaily Citat: "..."The king emitters are oaks," Wennberg says. "And the isoprene they emit is one of the reasons that the Smoky Mountains appear smoky."..."And isoprene only comes from plants. They make hundreds of millions of tons of this chemical...for reasons that we still do not fully understand."..."
^ Carnegie Mellon University. (2014, May 15). Emissions from forests influence very first stage of cloud formation. ScienceDaily Citat: "...This new study uncovers an indispensable ingredient to the long sought-after cloud formation recipe -- highly oxidized organic compounds..."It turns out that sulfuric acid and these oxidized organic compounds are unusually attracted to each other. This remarkably strong association may be a big part of why organics are really drawn to sulfuric acid under modern polluted conditions," Donahue said...The fine-tuned model not only predicted nucleation rates more accurately but also predicted the increases and decreases of nucleation observed in field experiments over the course of a year, especially for measurements near forests. This latter test is a strong confirmation of the fundamental role of emissions from forests in the very first stage of cloud formation, and that the new work may have succeeded in modeling that influence..."
^ 26. februar 2014, videnskab.dk: Forskningsgennembrud i aerosoler: Sådan danner træer skyer. Internationalt forskerhold med dansk deltagelse har fundet ud af, hvordan gas fra træer er med til at danne skyer og påvirke klimaet. Videnskaben har ellers kæmpet i omkring 20 år med at forstå, hvordan de såkaldte aerosoler bliver skabt. Citat: "...»Eksperimentet viste, at aerosoler dannes i store mængder henover skove og i langt større mængder, end vi forestillede os. Men det var også interessant at finde ud af, at NOx-gasser i byen gjorde, at aerosolerne ikke kunne dannes. Det var årsagen til, at vi ikke kunne få VOC’erne til at blive til aerosoler i laboratoriet, før mængden af NOx blev reduceret,« siger han..."

[1] Skovstatistik 2018 (Webside ikke længere tilgængelig) Thomas Nord-Larsen, Vivian Kvist Johannsen, Torben Riis-Nielsen, Iben Margrete Thomsen og Bruno Bilde Jørgensen (2019). Institut for Geovidenskab og Naturforvaltning, Københavns Universitet, Frederiksberg. 40 s. ill. ISBN 978-87-7903-813-4 (web)

[2] Penn State. (2004, May 6). Missing Chemical Important To Air Pollution Estimates. ScienceDaily Citat: "..."We think we measured all major components of the hydroxyl radical reactants, but there is something still unaccounted for,” says Brune. "We know that something we cannot identify is reacting with the hydroxyl radicals and we know it is temperature dependent and not light dependent. We just do not know what it is."..."

[3] California Institute of Technology (2009, August 7). Organic Carbon Compounds Emitted By Trees Affect Air Quality. ScienceDaily Citat: "..."The king emitters are oaks," Wennberg says. "And the isoprene they emit is one of the reasons that the Smoky Mountains appear smoky."..."And isoprene only comes from plants. They make hundreds of millions of tons of this chemical...for reasons that we still do not fully understand."..."

[4] Carnegie Mellon University. (2014, May 15). Emissions from forests influence very first stage of cloud formation. ScienceDaily Citat: "...This new study uncovers an indispensable ingredient to the long sought-after cloud formation recipe -- highly oxidized organic compounds..."It turns out that sulfuric acid and these oxidized organic compounds are unusually attracted to each other. This remarkably strong association may be a big part of why organics are really drawn to sulfuric acid under modern polluted conditions," Donahue said...The fine-tuned model not only predicted nucleation rates more accurately but also predicted the increases and decreases of nucleation observed in field experiments over the course of a year, especially for measurements near forests. This latter test is a strong confirmation of the fundamental role of emissions from forests in the very first stage of cloud formation, and that the new work may have succeeded in modeling that influence..."

[5] 26. februar 2014, videnskab.dk: Forskningsgennembrud i aerosoler: Sådan danner træer skyer. Internationalt forskerhold med dansk deltagelse har fundet ud af, hvordan gas fra træer er med til at danne skyer og påvirke klimaet. Videnskaben har ellers kæmpet i omkring 20 år med at forstå, hvordan de såkaldte aerosoler bliver skabt. Citat: "...»Eksperimentet viste, at aerosoler dannes i store mængder henover skove og i langt større mængder, end vi forestillede os. Men det var også interessant at finde ud af, at NOx-gasser i byen gjorde, at aerosolerne ikke kunne dannes. Det var årsagen til, at vi ikke kunne få VOC’erne til at blive til aerosoler i laboratoriet, før mængden af NOx blev reduceret,« siger han..."

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