Naslov
Eutrophication Process in the Plitvice Lakes, Croatia, as a Consequence of Anthropogenic Pollution and/or Natural Processes

Autori
Horvatinčić, Nada ; Barešić, Jadranka ; Obelić, Bogomil ; Krajcar Bronić, Ines ; Briansó, José Luis

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Archives of Climate Change in Karst. Karst Waters Institute Special Publication 10 / Onac, B.P. ; Tamas, T. ; Silviu , C. ; Persolu, A. - : Karst Waters Institute, 2006, 211-214

Skup
Climate Change: The Karst Record (IV)

Mjesto i datum
Băile Herculane, Rumunjska, 26.05.2006. - 29.05.2006

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Plitvice; sediment; eutrophication; d13C; 14C; mineral composition; organic composition; trace elements

Sažetak
The Plitvice Lakes are series of lakes, tufa barriers and waterfalls located in the karst region of northwestern Dinarides in Central Croatia. According to Polšak (1979) the impermeable Upper Triassic and Lower Jurassic dolomites and marly limestones prevent vertical water circulation. The permeable regions are characterized by karst dolinas, swallow holes, caves and poljes. Tufa are deposited on either limestone or dolomite bedrock. In the Plitvice Lakes calcium carbonate precipitates from the water in form of tufa forming tufa barriers and in form of fine-grained lake sediments. Conditions for tufa precipitation at the Plitvice Lakes including water chemistry, isotopic measurements of water and tufa/lake sediments and diagenesis of tufa were studied previously. All these studies showed that process of tufa precipitation is very sensitive to any kind of environmental pollution including water, soil and air. In the last decades enhacement of eutrophication process in this area, particularly in some lakes, has been observed. This process is usually the consequence of inflow of nutrients into the lakes. The reason for the intake could be anthropogenic pollution, but the natural origin of nutrients in the water is not excluded, e.g. input of percolating water from the humus surrounding the lakes (the land area is covered mainly with leaf forest). Lake sediments as the results of calcium carbonate precipitation from the dissolved inorganic carbon (DIC) record any kind of pollution in the water from the recent time, but also from the past. For this study we used surface lake sediments, the uppermost 40-45 cm, except location 4 up to 20 cm, from four different karstic lakes at five sampling points. The main characteristics of the sampling points are presented in Table 1: name of the lakes, lake area, water depth at the sediment sampling and sedimentation rate based on 137Cs and 210Pb measurements. Sediment cores were taken from the uppermost Lake Prošće to the lowermost Lake Kaluđerovac and the sites included lakes with strong eutrophication (locations 2, 3, 5) and with less pronounced eutrophication process. Samples for analyses were cut from the frozen sediment cores into 1-2 cm thick layers and dried at 120˚ C. The following analyses have been performed: mineralogical and organic elemental analyses, analyses of radiocarbon isotope d14C and stable isotope d13C, and trace element analyses.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Geologija, Kemija

POVEZANOST RADA