کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
12132199 | 944683 | 2018 | 41 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
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)
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Lake BolÄtÄu-Feredeu is a small (surface: 0.3â¯ha; catchment area: 31â¯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 BolÄtÄu-Feredeu covering the past â¼700 years. The ranges of δ13C values (â30.5 to â26.6â°) and C/N atomic ratios (10.5 and 15.4) placed the organic material of the recent BolÄtÄu-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 â¼1820. The C/N, δ15N, and δ13C values showed the highest variability probably linked to a variable lacustrine environment and decreased productivity in the catchment between â¼1640 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 â¼1470-1560.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Quaternary International - Volume 493, 10 November 2018, Pages 166-175
Journal: Quaternary International - Volume 493, 10 November 2018, Pages 166-175
نویسندگان
Máté Karlik, József Fekete, Marcel Mindrescu, Ionela GrÄdinaru, Gábor Bozsó, Lóránt BÃró, Zoltán Kern,