Bucovina Forestieră (Dec 2003)
Evoluția intrărilor de ioni minerali în ecosisteme forestiere din România în perioada 1998-2002 [Trends in mineral ions depositions în forest ecosystems from Romania for the period 1998- 2002]
Abstract
Bulk precipitation were collected in 6 stations located în forest ecosystems from north and south Romania, during 1998-2002. Samples were analysed in the laboratory for pH and the major anions and cations. For the 3 stations in the north only data from 1998 to 2001 were completed. The fluxes of mineral ions in bulk deposition measured in 2002 for the 3 stations located in south Romania were compared to the means determined in 1998-2001. The inputs decreased for S-SO4 2- ( 19-25 %), N-NO3 - ( 29-73%) and Cl- (cu 9-10%). For H+ , N-NH4 + , Na and K+ no trends were clearly observed. Ca2+ and Mg2+ fluxes in bulk deposition decresed in 2002 with 39-66% and respectivly 31- 78% related to 1998-2001. Comparison of the mean ions fluxes registred in the north and south Romania during 1998-2001 revealed that excepting for H+ and Cl- , which were higher in north than in south, for all the other ions the values determined in north were equal (N-NO3 - ) or lower (S-SO4 2-, N-NH4 + , K+ , Mg2+, Ca2+) than those measured in the south part of Romania. Values of mineral ions inputs registred in Romania from 1998 to 2002 were compared to those calculated in some zones of Europe from 1993 to 1998. Fluxes of H+ , Cland Na+ were relatevly low compared to those form Europe. The SSO4 2- fluxes were moderate and high and the NNH4 + , K+ , Mg2+, Ca2+ were high în Romania related to those determined in Europe.
