Wani abu kusan sihiri yana faruwa kowane faduwa. Menene? Wannan canjin launi ne na ganye akan bishiyoyi. Wasu daga cikin kyawawan bishiyun kaka:
- maple;
- goro;
- aspen;
- itacen oak
Wadannan bishiyoyi (da duk wasu bishiyoyi da suka rasa ganyayyakinsu) ana kiransu bishiyoyi masu yankewa.
Gandun daji
Itacen bishiyar itace itace da ke zubar da ganye a lokacin bazara kuma ta tsiro sababbi a cikin bazara. Kowace shekara, bishiyoyin bishiyoyi suna bi ta wani tsari wanda ganye korensu suna zama rawaya mai haske, zinariya, lemu da ja tsawon makonni da yawa kafin su zama ruwan kasa su fado kasa.
Menene ganyayyaki?
A watan Satumba, Oktoba da Nuwamba muna jin daɗin canza launi na ganyen bishiya. Amma bishiyoyin kansu basa canza launi, saboda haka kuna buƙatar gano dalilin da yasa ganye suka zama rawaya. A zahiri akwai dalili na faɗuwar launi iri-iri.
Photosynthesis tsari ne da bishiyoyi (da tsirrai) suke amfani dashi don "shirya abinci." Energyaukar kuzari daga rana, ruwa daga ƙasa, da iskar carbon dioxide daga iska, suna canza glucose (sukari) zuwa “abinci” don su girma zuwa tsire-tsire masu ƙoshin lafiya.
Photosynthesis yana faruwa a cikin ganyen bishiya (ko tsirrai) saboda chlorophyll. Chlorophyll shima yana yin sauran aiki; yana maida ganye koren.
Yaushe kuma me yasa ganye ya zama rawaya
Don haka, matuƙar ganyayen suna ɗaukar isasshen zafi da kuzari daga rana don abinci, ganyen bishiyar yana zama kore. Amma idan yanayi ya canza, yakan yi sanyi a wuraren da bishiyun bishiyoyi suke girma. Kwanaki suna yin guntu (ƙasa da hasken rana). Lokacin da wannan ya faru, zai zama da wahala ga chlorophyll a cikin ganyayyaki don shirya abincin da ake buƙata don kiyaye koren launi. Don haka, maimakon yin ƙarin abinci, ganyen sun fara amfani da abubuwan gina jiki da suka adana a cikin ganyen a cikin watannin zafi.
Lokacin da ganye yayi amfani da abincin (glucose) wanda ya taru a cikinsu, sai ƙwayoyin ƙwayoyin rai marasa komai a gindin kowane ganye. Waɗannan ƙwayoyin ƙwayoyin cuta suna kama kamar abin toshewa. Aikin su shine suyi aiki a matsayin ƙofa tsakanin ganye da sauran itacen. Wannan kofa a rufe take ahankali kuma "a bude take" har sai dukkan abinci daga ganyen ya cinye.
Ka tuna: chlorophyll yana sanya shuke-shuke da ganye kore
A yayin wannan aikin, tabarau daban-daban suna bayyana akan ganyen bishiyoyin. Launuka ja, rawaya, zinariya da lemu suna ɓoye a cikin ganyayyaki duk tsawon bazara. Ba za a iya ganin su a cikin lokacin dumi ba saboda yawan chlorophyll.
Gandun daji mai rawaya
Da zarar an gama amfani da dukkan abincin, ganyen ya zama rawaya, ya zama ruwan kasa, ya mutu ya fadi kasa.
