{"id":24934,"date":"2020-07-10T00:35:05","date_gmt":"2020-07-09T22:35:05","guid":{"rendered":"https:\/\/www.miljomagasinet.se\/?p=24934"},"modified":"2020-07-08T16:35:40","modified_gmt":"2020-07-08T14:35:40","slug":"ljus-viktigt-for-vaxters-kollagring","status":"publish","type":"post","link":"https:\/\/www.miljomagasinet.se\/index.php\/2020\/07\/10\/ljus-viktigt-for-vaxters-kollagring\/","title":{"rendered":"Ljus viktigt f\u00f6r v\u00e4xters kollagring"},"content":{"rendered":"\n

\u00c4ven om klimatet blir varmare och v\u00e4xter kan gro l\u00e4ngre norrut begr\u00e4nsas deras f\u00f6rm\u00e5ga att lagra kol av det tillg\u00e4ngliga ljuset, enligt en ny studie.<\/b><\/p>\n\n\n\n

\"\"
Att det blir mer v\u00e4xtlighet betyder inte att mer kol binds, om inte omst\u00e4ndigheterna \u00e4r de r\u00e4tta, enligt ny forskning.
(Foto: Vinterfrid<\/a> \/ CC BY-SA<\/a>)<\/figcaption><\/figure><\/div>\n\n\n\n

De flesta projektioner f\u00f6r klimatf\u00f6r\u00e4ndringar visar att nordliga regioner kan komma att bli b\u00e4ttre anpassade f\u00f6r v\u00e4xtlighet n\u00e4r temperaturerna stiger, vilket skulle kunna ge odlingsbar mark som kan f\u00f6da den v\u00e4xande populationen samtidigt som mer koldioxid binds och bromsar klimatf\u00f6r\u00e4ndringarna. Men v\u00e4xter beh\u00f6ver b\u00e5de r\u00e4tt temperatur, vatten och ljus f\u00f6r fotosyntes och tillv\u00e4xt. Det kan tyckas troligt att fotosyntesen, som omvandlar koldioxid till syre, skulle \u00f6ka, men forskare ser \u00e4ven att v\u00e4xternas andning som utg\u00f6r det motsatta och \u00e4r starkt beroende av v\u00e4rmen kommer att \u00f6ka. D\u00e4rf\u00f6r \u00e4r det fortfarande under debatt huruvida varmare h\u00f6star kommer att \u00f6ka kolupptagningen eller minska den. <\/p>\n\n\n\n

Det \u00e4r en fr\u00e5ga<\/b> forskare vid Columbia Engineering i New York har f\u00f6rs\u00f6kt finna svar p\u00e5. De fann att ljuset \u00e4r en stark faktor som begr\u00e4nsar upptaget av kol p\u00e5 nordliga latituder, \u00e4ven i varma temperaturer utan stress fr\u00e5n kyla. Studien, i Nature Climate Change, anv\u00e4nde sig av satellitdata, f\u00e4ltobservationer och simulerade modeller f\u00f6r att visa hur fotosyntesen p\u00e5verkas av ljuset i nordliga ekosystem, speciellt under h\u00f6sten. Med hj\u00e4lp av den nya datan tog de fram en algoritm f\u00f6r att kartl\u00e4gga fotosyntes planeten \u00f6ver och utvecklade ett ramverk f\u00f6r att kvantifiera vad den begr\u00e4nsade ljustillf\u00f6rseln inneb\u00e4r.<\/p>\n\n\n\n

\u2013 Tidigare studier har kommit till olika slutsatser n\u00e4r det g\u00e4ller om varmare h\u00f6star skulle binda eller sl\u00e4ppa ut mer kol. V\u00e5r rapport visar hur man kan anv\u00e4nda en kombination av distansm\u00e4tningar och observationer p\u00e5 plats f\u00f6r att l\u00f6sa en kontrovers kring kolupptag, s\u00e4ger Yao Zhang, som byggde den nya algoritmen och \u00e4r huvudf\u00f6rfattare till studien.<\/p>\n\n\n\n

P\u00e5 latituder \u00f6ver<\/b> 30\u02daN fann forskarna att fotosyntesen under s\u00e4songens slut huvudsakligen styrs av ljuset i sitt svar till v\u00e4rmen. I vissa regioner minskar dagsljuset mycket snabbt, och mindre ljus leder till svagare fotosyntes som inte kan uppv\u00e4ga den \u00f6kade andningen till f\u00f6ljd av uppv\u00e4rmning. Eftersom ljusbegr\u00e4nsningen \u00e4r s\u00e5 stark p\u00e5 s\u00e5 nordliga platser kommer vegetationen att sl\u00e4ppa ut mer kol under h\u00f6starna om uppv\u00e4rmningen forts\u00e4tter. Och ljusbristen kommer att \u00f6ka om v\u00e4xts\u00e4songen blir l\u00e4ngre till f\u00f6ljd av uppv\u00e4rmning eftersom de korta dagarna under v\u00e5r och h\u00f6st resulterar i mindre dagsljus.<\/p>\n\n\n\n

\u2013 Den \u00f6kande ljusbegr\u00e4nsningen kommer att minska de nordliga ekosystemens potential att agera som kontinuerlig kol-s\u00e4nka, s\u00e4ger Yao Zhang.<\/p>\n\n\n\n

\u2013 V\u00e5r studie understryker vilken viktig roll solens str\u00e5lning spelar, som ofta ignoreras i studier om klimatf\u00f6r\u00e4ndringar.<\/p>\n","protected":false},"excerpt":{"rendered":"

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