Tundra shine kyakkyawan rijiyar carbon... Akalla shi ne. A zamanin yau, ƙarfin ajiyarta ya lalace sosai, saboda ƙaruwar zafin jiki: kwayoyin rayuwa suna fitar da ƙarin CO2 zuwa sararin samaniya, yayin da tsarin ɗaukar hoto mai tasiri yake tasiri a wasu matakan.
Tare da canjin yanayi, ciyayi kuma kwayoyin halitta na iya fitar da karin abubuwa carbona cikin hanyar carbon dioxide ko methane, fiye da yadda zasu iya adanawa. Fiye da shekaru goma yanzu, masu binciken sun tsaya a tashar bincike na Zackenberg, a arewacin Greenland, tantance ma'aunin carbon na duka tundra da hemisphere arewa.
A wani binciken da aka buga a mujallar Jaridar Nazarin Geophysical, kungiyar da aka jagoranta Magnus Lund ya nuna cewa hayakin CO2 da kwayoyin halittu ke fitarwa suna ƙaruwa yayin da yawan zafin jiki ke ƙaruwa.
Don saita daidaiton carbon na tundra, masana kimiyya sunyi nazari kan sharuda guda biyu: adadin karbon da ake fitarwa a cikin sifar CO2 numfashi, da kuma adadin da tsire-tsire ke adana ta cikin photosynthesis. Daga waɗannan sharuɗɗa guda biyu, yana yiwuwa a tantance ko tundra tushe ne ko rijiyar carbon.
El binciken ya nuna cewa hayakin CO2 da sanadin numfashin dabbobi ya karu daidai da da zazzabi. A gefe guda, ƙarfin ajiyar carbon da ke da alaƙa da photosynthesis yana raguwa yayin da yawan zafin jiki ke ƙaruwa. A bayyane wannan ajiya daina lokacin da zazzabi ya wuce 7ºC.
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