TY - JOUR AU - Karlik, Máté AU - Fekete, József AU - Mindrescu, M AU - Grădinaru, I AU - Bozsó, Gábor AU - Biró, Lóránt AU - Kern, Zoltán TI - Natural and anthropogenic changes in a lake-forest system in Bukovina (Romania) since 1340 AD documented by sedimentary organic geochemistry (C, N and n-alkanes) JF - QUATERNARY INTERNATIONAL J2 - QUATERN INT VL - 493 PY - 2018 SP - 166 EP - 175 PG - 10 SN - 1040-6182 DO - 10.1016/j.quaint.2018.06.008 UR - https://m2.mtmt.hu/api/publication/3392243 ID - 3392243 N1 - Funding Agency and Grant Number: European Union; State of Hungary; European Regional Development Fund [GINOP-2.3.2.-15-2016-00009]; National Research, Development and Innovation Office [K125060]; [LP2012-27/2012]\n Funding text: The research was supported by the European Union and the State of Hungary, co-financed by the European Regional Development Fund in the project of GINOP-2.3.2.-15-2016-00009 ICER. Thanks for the financial support of the National Research, Development and Innovation Office (K125060) and LP2012-27/2012. This is contribution No. 60 of 2ka Palaeoclimatology Research Group.\n AB - Lake Bolatau-Feredeu is a small (surface: 0.3 ha; catchment area: 31 ha) landslide-dammed lake in Bukovina (Eastern Carpathians, Romania). Elemental concentration, stable isotope composition of carbon and nitrogen, and n-alkane composition of the saturated hydrocarbon fraction of the organic material were analyzed along the sediment profile from Lake Bolatau-Feredeu covering the past 700 years. The ranges of delta C-13 values (- 30.5 to - 26.6 parts per thousand) and C/N atomic ratios (10.5 and 15.4) placed the organic material of the recent Bolatau-Feredeu sediment between the C3 Land Plants and the lacustrine algae. The n-alkane proxies provide better distinction between organic matter inputs. Detected major shifts in the n-alkane composition and the C and N concentrations along with the stable isotope compositions pointed towards three distinct stages in the environmental history of the lake-catchment system. The proxy information indicate a substantial landscape change characterized by deforestation and an increase in open pastureland with herbaceous vegetation from similar to 1820. The C/N, delta N-15, and delta C-13 values showed the highest variability probably linked to a variable lacustrine environment and decreased productivity in the catchment between similar to 1640 and 1760. It can be assumed that the extended periods of lake ice cover during the cold decades experienced at the turn of the 17th -18th centuries resulted in diminished biological productivity both in the lake and its catchment. Finally, afforestation and the decline in lake productivity have been reconstructed for the period of - 1470-1560. LA - English DB - MTMT ER - TY - JOUR AU - Bihari, Árpád AU - Karlik, Máté AU - Mîndrescu, M AU - Szalai, Zoltán AU - Grădinaru, I AU - Kern, Zoltán TI - Fallout isotope chronology of the near-surface sediment record of Lake Bolătău JF - JOURNAL OF ENVIRONMENTAL RADIOACTIVITY J2 - J ENVIRON RADIOACTIV VL - 181 PY - 2018 SP - 32 EP - 41 PG - 10 SN - 0265-931X DO - 10.1016/j.jenvrad.2017.10.009 UR - https://m2.mtmt.hu/api/publication/3288140 ID - 3288140 LA - English DB - MTMT ER -