Importance of flood zones for nitrogen and phosphorus dynamics in the Danube Delta
Tóm tắt
The change of concentration of total reactive phosphorus (TRP) and dissolved inorganic nitrogen (DIN) was studied in the lower Danube river and in selected lakes situated in the wetland area of the Danube Delta. The differences Danube Delta in nutrient concentration in the river waters entering the delta and the delta in different sites (especially lakes) of the wetland area are considered to reflect retention in the system. The highest retention was found in periods of moderate and low water level when the surface-to-volume ratio of the lakes was high. In these periods the in-lake concentration of TRP and DIN could be as low as 11 and 23% of the values found in the inflowing river.
Tài liệu tham khảo
Botnariuc N., Gh. Ignat, I. Diaconu & A. Vadineanu, 1987. L'evolution de l'état trophique des ecosystemes aquatiques caracteristiques du Delta du Danube. 5. La structure et la dynamique de la faune benthonique, Rev. roum. Biol. - Biol. Anim. 32: 121–127.
Cristofor, S., 1986. Tendencies in structure and production of submerged macrophytes communities of the Danube Delta, between 1980–1983. Hidrobiologia 19: 113–118.
Cristofor, S., 1987. L'evolution de l'état trophique des écosystemes aquatiques caracteristiques du Delta de Danube. 6. Réponses de la végétation submerse en fonction de la réserve de nutrients et du régime hydrologique. Rev. roum. -Biol. Anim. 32: 129–138.
Naiman, J. R., H. Decamps & F. Forneir (eds), 1989. The role of Land/Inland Water Ecotones in Landscape Management and Restoration. A Proposal for Collaborative Research. MAB Digest 4. UNESCO, Paris, 96 pp.
Schneider E., 1991. Vegetation. In L. Hopkins (ed.), Conservation status of the Danube Delta. IUCN — East European Programme. Draft Report: 83–96.
Vadineanu A. & S. Cristofor, 1987. L'évolution de l'état trophique des écosystemes aquatiques caractéristiques du Delta du Danube. I. Le régime hydrologique, la transparence Secchi et la réserve de phosphore et d'azote. Rev. roum. - Biol. Anim. 32: 83–91.