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E ai ki ngā kairangahau o Te Whare Wānanga o Nagoya i Hapani, he mea nui ngā hauota e kohia ana i roto i te oneone e tata ana ki ngā awa ki te whakapiki i ngā taumata hauota i roto i te wai awa i te wā ua. Tērā pea ka āwhina ā rātou kitenga, i whakaputaina i roto i te puka Biogeoscience, ki te whakaiti i te parahanga hauota me te whakapai ake i te kounga o te wai i roto i ngā wai o raro iho i te awa pērā i ngā roto me ngā wai takutai.
He matūkai nui ngā nitrates mō ngā tipu me ngā phytoplankton, engari mā te nui o ngā nitrates i roto i ngā awa ka heke te kounga o te wai, ka arahi ki te eutrophication (te nui rawa o ngā matūkai i roto i te wai), ā, ka tū hei mōrearea ki te hauora o ngā kararehe me ngā tāngata. Ahakoa e mōhiotia ana ka piki ake ngā taumata nitrate i roto i ngā awa ina ua, kāore i te mārama he aha.
E rua ngā ariā matua mō te pikinga o te nitrate ina ua. E ai ki te ariā tuatahi, ka rewa ngā nitrate o te hau ki roto i te wai ua, ka uru tika ki ngā awa. Ko te ariā tuarua, ina ua, ka uru ngā nitrate oneone i te rohe e tata ana ki te awa, e mōhiotia ana ko te rohe riparian, ki te wai o te awa.
Hei rangahau anō i te pūtake o ngā nitrates, i whakahaerehia e tētahi rōpū rangahau nā Ahorangi Urumu Tsunodai o te Kura Paerua o ngā Akoranga Taiao, i te mahi tahi me te Asian Center for Air Pollution Research, tētahi rangahau hei tātari i ngā panonitanga o te hanganga o ngā isotopes hauota me te hāora i roto i ngā nitrates me te wā ua nui. Te pikinga ake o ngā kukū nitrates i roto i ngā awa.
Kua pūrongohia e ngā rangahau o mua te pikinga nui o ngā kukū nitrate i ngā wā o ngā awha i roto i tētahi awa i te taha whakarunga o te awa o Kaji i te rohe o Niigata i te raki-mā-uru o Hapani. I kohia e ngā kairangahau ngā tauira wai mai i te rohe hopu wai o Kajigawa, tae atu ki ngā awa i te taha whakarunga o te awa. I roto i ngā awha e toru, i whakamahia e rātou ngā autosamplers hei whakamātautau i ngā awa o ngā rohe wai i ia hāora mō ngā hāora 24.
I ine te tīma i te kukū me te hanganga isotopic o ngā nitrates i roto i te wai o te awa, kātahi ka whakaritea ngā hua ki te kukū me te hanganga isotopic o ngā nitrates i roto i te oneone i te rohe takutai o te awa. Nō reira, i kitea e rātou ko te nuinga o ngā nitrates i ahu mai i te oneone, ehara i te wai ua.
"I whakatau mātou ko te horoinga o ngā nitrate oneone takutai ki roto i ngā awa nā te pikinga o ngā taumata o ngā awa me te wai whenua te tino take o te pikinga o ngā nitrate i roto i ngā awa i ngā wā tupuhi," te kī a Tākuta Weitian Ding o Te Whare Wānanga o Nagoya, te kaituhi o te rangahau.
I tātarihia hoki e te tīma rangahau te pānga o te nitrate hau ki te pikinga o te rere o te nitrate i ngā wā tupuhi. Kāore i rerekē te nui o ngā nitrate hau i roto i te wai awa, ahakoa te pikinga o te ua, e tohu ana i te iti o te awe o ngā pūtake o ngā nitrate hau.
I kitea anō hoki e ngā kairangahau ko ngā nitrate o te oneone takutai moana ka puta mai i ngā moroiti oneone. "E whakaponohia ana ko ngā nitrate nō te takenga mai o ngā moroiti ka kohia ki ngā oneone takutai moana i te raumati me te ngahuru anake i Hapani," te whakamārama a Ahorangi Tsunogai. "Mai i tēnei tirohanga, ka taea e tātou te matapae ko te pikinga o ngā nitrate i roto i te awa nā te ua ka puta noa i ēnei wā."
Tohutoro: Dean W, Tsunodai W, Nakagawa F, et al. I whakaatuhia e te whai i te pūtake o ngā nitrates i roto i ngā awa o te ngahere he nui ake ngā kukū i te wā o ngā tupuhi. Biogeoscience. 2022;19(13):3247-3261. doi: 10.5194/bg-19-3247-2022
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