Zum Stoffhaushalt des Donaustaus Eisernes Tor I
Gruia, E.; Marcoci, S.
On the basis of annual averages of oxygen concentration and oxygen deficit the dynamics of the oxygen budget are investigated for the Danube impoundment Iron Gate I. The oxygen deficit increased by 16.4% of saturation during 10 years; 11.l % of that are due to oxygen consumption by nitrification processes. The carbon-BSB increased by 35% and the oxygen consumption of the river sediment by 1.8% during the same time. Changes in the oxygen regime result from intensified physical, chemical and biological processes due to increased pollution and reduced flow in the impoundment which are also indicated by chemical indicators, saprobity and photosynthetic activity of phytoplankton.