Cika fom ɗin da ke ƙasa kuma za mu aiko muku da imel ta hanyar PDF na Riverside Soils Are a Significant Tushen Gurɓatar Nitrate.
Masu bincike daga Jami'ar Nagoya da ke Japan sun ba da rahoton cewa nitrates da ke taruwa a ƙasa kusa da koguna suna taka muhimmiyar rawa wajen ƙara yawan nitrates a cikin ruwan kogi yayin ruwan sama. Binciken da suka yi, wanda aka buga a cikin mujallar Biogeoscience, zai iya taimakawa wajen rage gurɓatar nitrogen da inganta ingancin ruwa a cikin ruwan da ke ƙasa kamar tafkuna da ruwan bakin teku.
Nitrates muhimmin sinadari ne ga tsirrai da phytoplankton, amma yawan nitrates a cikin koguna na iya lalata ingancin ruwa, haifar da eutrophication (ƙara wadatar ruwa da abubuwan gina jiki), da kuma haifar da haɗari ga lafiyar dabbobi da mutane. Duk da cewa an san cewa matakan nitrates a cikin koguna suna ƙaruwa lokacin da aka yi ruwan sama, ba a san dalilin ba.
Akwai manyan ka'idoji guda biyu game da yadda nitrate ke ƙaruwa lokacin da aka yi ruwan sama. A cewar ka'idar farko, nitrates na yanayi suna narkewa a cikin ruwan sama kuma suna shiga kai tsaye cikin rafuffuka. Ka'idar ta biyu ita ce lokacin da aka yi ruwan sama, nitrates na ƙasa a yankin da ke kan iyakar kogin, wanda aka sani da yankin riparian, suna shiga ruwan kogin.
Domin ƙarin bincike kan tushen nitrates, wata ƙungiyar bincike ƙarƙashin jagorancin Farfesa Urumu Tsunogai na Makarantar Digiri ta Nazarin Muhalli, tare da haɗin gwiwar Cibiyar Binciken Gurɓatar Iska ta Asiya, sun gudanar da wani bincike don nazarin canje-canje a cikin abubuwan da ke cikin isotopes na nitrogen da oxygen a cikin nitrates da kuma lokacin ruwan sama mai ƙarfi. Ƙara yawan nitrates a cikin koguna.
Binciken da aka yi a baya ya nuna cewa yawan sinadarin nitrate ya karu sosai a lokacin guguwar ruwa a wani kogi da ke gefen kogin Kaji a yankin Niigata a arewa maso yammacin Japan. Masu binciken sun tattara samfuran ruwa daga magudanar ruwa ta Kajigawa, ciki har da daga kogunan da ke gefen kogin. A lokacin guguwar ruwa guda uku, sun yi amfani da na'urorin gwaji na atomatik don yin samfurin kogunan ruwa a kowace awa na tsawon awanni 24.
Tawagar ta auna yawan sinadarin nitrates da kuma sinadarin isotopic da ke cikin ruwan rafin, sannan ta kwatanta sakamakon da yawan sinadarin nitrates da kuma sinadarin isotopic da ke cikin ƙasa a yankin bakin teku na rafin. Sakamakon haka, sun gano cewa yawancin sinadarin nitrates sun fito ne daga ƙasa ba daga ruwan sama ba.
"Mun kammala da cewa wanke nitrates na ƙasa a bakin teku zuwa rafuka saboda ƙaruwar matakan rafuka da kuma ruwan ƙasa shine babban dalilin ƙaruwar nitrates a cikin rafuka yayin guguwa," in ji Dr. Weitian Ding na Jami'ar Nagoya, marubucin binciken.
Ƙungiyar binciken ta kuma yi nazari kan tasirin nitrate na yanayi kan ƙaruwar kwararar nitrate a lokacin guguwa. Yawan nitrates na yanayi a cikin ruwan kogin bai canza ba, duk da ƙaruwar ruwan sama, wanda ke nuna ɗan tasirin tushen nitrates na yanayi.
Masu binciken sun kuma gano cewa ƙwayoyin ƙasa suna samar da nitrates na ƙasa a bakin teku. "Ana tsammanin cewa nitrates na asalin ƙwayoyin cuta suna taruwa a cikin ƙasa a bakin teku ne kawai a lokacin rani da kaka a Japan," in ji Farfesa Tsunogai. "Daga wannan mahangar, za mu iya annabta cewa ƙaruwar nitrates a cikin kogin saboda ruwan sama zai faru ne kawai a waɗannan lokutan."
Tunani: Dean W, Tsunogai W, Nakagawa F, da sauransu. Bin diddigin tushen nitrates a cikin rafukan daji ya nuna ƙaruwar yawan ruwa a lokacin guguwa. Biogeoscience. 2022;19(13):3247-3261. doi: 10.5194/bg-19-3247-2022
An sake buga wannan labarin daga kayan da ke ƙasa. Lura. Ana iya gyara abubuwan da aka gabatar don tsawon lokaci da abun ciki. Don ƙarin bayani, duba tushen da aka ambata.