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Pregled bibliografske jedinice broj: 124656

Nutrient fluxes and sulfur cycling in the organic-rich sediment of Makirina Bay (Central Dalmatia, Croatia)


Lojen, Sonja; Ogrinc, Nives; Dolenec, Tadej; Vokal, Barbara; Szaran, Janina; Mihelčić, Goran; Branica, Marko
Nutrient fluxes and sulfur cycling in the organic-rich sediment of Makirina Bay (Central Dalmatia, Croatia) // Science of the Total Environment, 327 (2004), 1-3; 265-284 (međunarodna recenzija, članak, znanstveni)


CROSBI ID: 124656 Za ispravke kontaktirajte CROSBI podršku putem web obrasca

Naslov
Nutrient fluxes and sulfur cycling in the organic-rich sediment of Makirina Bay (Central Dalmatia, Croatia)

Autori
Lojen, Sonja ; Ogrinc, Nives ; Dolenec, Tadej ; Vokal, Barbara ; Szaran, Janina ; Mihelčić, Goran ; Branica, Marko

Izvornik
Science of the Total Environment (0048-9697) 327 (2004), 1-3; 265-284

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Benthic flux; Nutrients; Sedimentary organic matter; Stable isotope; Sulfur

Sažetak
Fluxes of dissolved nutrients in the organic-rich sediment of Makirina Bay (Croatia) were estimated in in-situ incubation experiments and compared to those calculated from a diagenetic model based on the concentration vs. depth profiles in the pore water extracted from a sediment core at the same sampling site. Benthic fluxes observed in the in-situ experiment were strongly influenced by the decomposition of sedimentary organic matter by bacterial sulfate reduction and precipitation of authigenic pyrite and calcite. Assimilation of dissolved nitrate and ammonia within the sediment resulted in peculiar nitrate and ammonia concentration profiles. Differences between the benthic and diffusive fluxes indicated that the effects of bioturbation and irrigation, which were not taken into account in the model calculation of diffusive fluxes, should not be considered as negligible. They are, however, extremely difficult to estimate because of the heterogeneity of the sediment. Sulfate reduction in the pore water could not be detected, although it was obvious from pyrite precipitation and the isotopic compositions of different sedimentary sulfur species. It is suggested that reoxidation of sulfide and upward diffusion of sulfate from the sediment layer accumulated during past salt production can account for the scattered sulfate vs. depth profile. The distribution and stable isotope compositions of sedimentary sulfur species were studied in more detail. The influx of sulfate was explained by rapid sulfate reduction in the sediment. The sulfate reduction rate was highest in the upper part of the sediment column, as concluded from 34S values. In lower horizons, the concentration of organic sulfur increased, while concentrations of sulfide decreased. The mirror-imaged concentration vs. depth profiles of sulfide and organic sulfur, as well as their stable isotopic compositions, show that they were formed simultaneously, most probably in competitive processes.

Izvorni jezik
Engleski

Znanstvena područja
Geologija



POVEZANOST RADA


Projekti:
0098121
0098132

Ustanove:
Institut "Ruđer Bošković", Zagreb

Profili:

Avatar Url Goran Mihelčić (autor)

Avatar Url Marko Branica (autor)


Citiraj ovu publikaciju:

Lojen, Sonja; Ogrinc, Nives; Dolenec, Tadej; Vokal, Barbara; Szaran, Janina; Mihelčić, Goran; Branica, Marko
Nutrient fluxes and sulfur cycling in the organic-rich sediment of Makirina Bay (Central Dalmatia, Croatia) // Science of the Total Environment, 327 (2004), 1-3; 265-284 (međunarodna recenzija, članak, znanstveni)
Lojen, S., Ogrinc, N., Dolenec, T., Vokal, B., Szaran, J., Mihelčić, G. & Branica, M. (2004) Nutrient fluxes and sulfur cycling in the organic-rich sediment of Makirina Bay (Central Dalmatia, Croatia). Science of the Total Environment, 327 (1-3), 265-284.
@article{article, year = {2004}, pages = {265-284}, keywords = {Benthic flux, Nutrients, Sedimentary organic matter, Stable isotope, Sulfur}, journal = {Science of the Total Environment}, volume = {327}, number = {1-3}, issn = {0048-9697}, title = {Nutrient fluxes and sulfur cycling in the organic-rich sediment of Makirina Bay (Central Dalmatia, Croatia)}, keyword = {Benthic flux, Nutrients, Sedimentary organic matter, Stable isotope, Sulfur} }
@article{article, year = {2004}, pages = {265-284}, keywords = {Benthic flux, Nutrients, Sedimentary organic matter, Stable isotope, Sulfur}, journal = {Science of the Total Environment}, volume = {327}, number = {1-3}, issn = {0048-9697}, title = {Nutrient fluxes and sulfur cycling in the organic-rich sediment of Makirina Bay (Central Dalmatia, Croatia)}, keyword = {Benthic flux, Nutrients, Sedimentary organic matter, Stable isotope, Sulfur} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus
  • MEDLINE





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