Slāpekļa savienojumu aprite uz sedimentu –ūdens robežvirsmas Rīgas līcī.
Date
2012
Authors
Eglīte, Elvita
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Publisher
Latvijas Universitāte
Abstract
Darbā ir analizēti zinātnisko reisu laikā iegūtie dati par nitrātjonu, amonija jonu un denitrifikācijas procesa plūsmu dinamiku uz sedimentu-ūdens robežvirsmas, kā arī novērtēta plūsmu atkarība no skābekļa koncentrācijas ūdens slānī virs sedimentiem augustā, oktobrī, novembrī, janvārī, martā un aprīlī. Denitrifikācijas plūsmas kvantitatīvai noteikšanai tika lietota izotopu pāru metode. Lai nodrošinātu rezultātu kvalitāti un iegūtie rezultāti būtu salīdzināmi ar citos Baltijas jūras apakšbaseinos veikto pētījumu rezultātiem, paraugu analīzes veica Dānijas Nacionālajā vides pētniecības institūtā ar izstrādātu gāzu hromatogrāfijas-masspektrometrijas metodi.
Literatūras apskatā apkopota informācija par slāpekļa apriti jūras ekosistēmā. Sīkāk ir apskatīti slāpekļa savienojumu pārneses procesi uz sedimentu-ūdens robežvirsmas un tos kontrolējošie faktori.
Data on flux dynamics of nitrate, nitrite and denitrification process, obtained during scientific cruises, on the sediment-water interface as well as flux dependency on oxygen concentrations in the water layer above sediments in August, October, November, January, March, and April have been evaluated. Denitrification fluxes were assessed quantitatively by isotope pairing technique. To ensure the quality of the results and their comparability with the results obtained by other authors in the other sub-basins of the Baltic Sea, the samples were analysed at National Environmental Research Institute of Denmark by customary made gass chromatography-masspectrometry method. Literature review summarises information on nitrogen cycling in marine ecosystem. A detailed insight into nitrogen compound transfer processes on the sediment-water interface and influential factors has been provided.
Data on flux dynamics of nitrate, nitrite and denitrification process, obtained during scientific cruises, on the sediment-water interface as well as flux dependency on oxygen concentrations in the water layer above sediments in August, October, November, January, March, and April have been evaluated. Denitrification fluxes were assessed quantitatively by isotope pairing technique. To ensure the quality of the results and their comparability with the results obtained by other authors in the other sub-basins of the Baltic Sea, the samples were analysed at National Environmental Research Institute of Denmark by customary made gass chromatography-masspectrometry method. Literature review summarises information on nitrogen cycling in marine ecosystem. A detailed insight into nitrogen compound transfer processes on the sediment-water interface and influential factors has been provided.
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