Gcwalisa le fomu ingezantsi kwaye siza kukuthumelela i-imeyile inguqulelo yePDF yeRiverside Soils Ngumthombo Obalulekileyo woNgcoliseko lweNitrate.
Ii-nitrate eziqokelela emhlabeni kufuphi nemilambo zidlala indima ebalulekileyo ekunyuseni amanqanaba e-nitrate emanzini omlambo ngexesha lemvula, abaphandi abavela kwiYunivesithi yaseNagoya eJapan babika. Iziphumo zabo, ezipapashwe kwiphephancwadi i-Biogeoscience, zinokunceda ukunciphisa ungcoliseko lwe-nitrogen kunye nokuphucula umgangatho wamanzi kumanzi asezantsi njengamachibi kunye namanzi aselunxwemeni.
I-Nitrates sisondlo esibalulekileyo kwizityalo kunye ne-phytoplankton, kodwa amanqanaba aphezulu e-nitrate emilanjeni anokuthobisa umgangatho wamanzi, akhokelela kwi-eutrophication (ukutyebisa ngokugqithisileyo kwamanzi ngezondlo), kwaye kubeka ingozi kwimpilo yezilwanyana kunye nabantu. Nangona amanqanaba e-nitrate kwimisinga ayaziwa ngokunyuka xa kunetha, akucaci ukuba kutheni.
Kukho iingcamango ezimbini eziphambili malunga nendlela i-nitrate eyanda ngayo xa kunetha. Ngokutsho kwethiyori yokuqala, i-nitrate ye-atmospheric inyibilika emanzini emvula kwaye ingena ngqo kwimisinga. Ithiyori yesibini yeyokuba xa kunetha imvula, i-nitrate yomhlaba kwindawo esecaleni komlambo, eyaziwa ngokuba yi-riparian zone, ingena emanzini omlambo.
Ukuqhubela phambili uphando ngomthombo we-nitrate, iqela lophando elikhokelwa nguNjingalwazi u-Urumu Tsunogai we-Graduate School of Environmental Studies, ngokubambisana ne-Asian Centre for Air Pollution Research, lenze uphando lokuhlalutya utshintsho ekubunjweni kwe-nitrogen kunye ne-oksijini isotopes kwi-nitrate kwaye ngexesha leemvula ezinkulu. Ukonyuka koxinzelelo lwenitrate emilanjeni.
Uphononongo lwangaphambili luchaze ukonyuka okubalulekileyo kokugxilwa kwenitrate ngexesha lezaqhwithi kumlambo ongasentla koMlambo iKaji kwiSithili saseNiigata kumntla-ntshona weJapan. Abaphandi baqokelele iisampulu zamanzi ukusuka kwindawo yokubamba i-Kajigawa, kubandakanywa nemilambo ephezu komlambo. Ngexesha lezaqhwithi ezithathu, basebenzisa iisampulu ze-autosamplers ukukhangela imisinga yamanzi rhoqo ngeyure iiyure ezingama-24.
Iqela lalinganisa uxinaniso kunye nokwakheka kwe-isotopic yenitrate emanzini omlambo, laze lathelekisa iziphumo kunye noxinaniso kunye nokwakheka kwe-isotopic ye-nitrate emhlabeni kwindawo yonxweme yomlambo. Ngenxa yoko, bafumanisa ukuba inkoliso yeenitrate ivela emhlabeni kungekhona emanzini emvula.
"Sagqiba ukuba ukuhlanjululwa kwe-nitrate yomhlaba wonxweme kwimifudlana ngenxa yokunyuka kwamanqanaba omlambo kunye namanzi aphantsi komhlaba kwakuyeyona nto ibangela ukwanda kwe-nitrate kwimifudlana ngexesha lezaqhwithi," kusho uDkt Weitian Ding weYunivesithi yaseNagoya, umbhali wophando.
Iqela lophando liphinde lahlalutya umphumo we-nitrate ye-atmospheric ekunyukeni kwe-nitrate flux ngexesha lezaqhwithi. Umxholo we-nitrate ye-atmospheric kumanzi omlambo uhlala ungatshintshi, nangona ukwanda kwemvula, ebonisa impembelelo encinci yemithombo ye-nitrate ye-atmospheric.
Abaphandi bakwafumanise ukuba i-nitrate yomhlaba oselunxwemeni iveliswa ziintsholongwane zomhlaba. Unjingalwazi Tsunogai uthi: “Kukholelwa ukuba iinitrate zemicrobial zikhula kumhlaba oselunxwemeni kuphela ehlotyeni nasekwindla eJapan. Ngokwale mbono, sinokuqikelela ukuba ukwanda kwe-nitrate emlanjeni ngenxa yemvula kuya kwenzeka kuphela ngala maxesha onyaka.
Isalathiso: UDean W, Tsunogai W, Nakagawa F, et al. Ukulandelela umthombo we-nitrate kwimisinga yehlathi kubonise ukugxila okuphezulu ngexesha lezehlo zesaqhwithi. I-Biogeoscience. 2022;19(13):3247-3261. doi: 10.5194/bg-19-3247-2022
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