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    Wyświetlanie 1-3 z 3
    Tytuł:
    Late Pleistocene and Holocene environmental evolution of the Wkra River Valley near Bielawy Gołuskie (central Poland) recorded in palaeo-oxbow lake deposits
    Autorzy:
    Niska, M.
    Jonczak, J.
    Gadziszewska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060392.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    oxbow lake
    Wkra River
    Polska
    Multi-proxy analysis
    Early Holocene
    Opis:
    This study aimed to reconstruct environmental changes in the Wkra River Valley near Bielawy Gołuskie (central Poland) based on geochemical, palynological and subfossil Cladocera analysis of deposits filling a palaeo-oxbow lake. Two sediment boreholes collected from the palaeochannel bend (BG-1) and neck (BG-2) include full sequences of organic deposits lying on clastic deposits. The lower part of the BG-1 borehole contains gyttja that accumulated during the Younger Dryas and the Preboreal, which is covered by reed peat of Preboreal and Boreal age. On top of this is alder peat that accumulated during the Atlantic. The ages of the gyttja and peat were confirmed by both radiocarbon dating and palynological analysis. The peats are characterized by a significant content of organic matter, which is relatively stable over time. This indicates a low intensity of mechanical denudation in the catchment, which is supported by low concentrations of aluminum and potassium. Calcium values greatly exceed these elements, suggesting that the lake was mainly fed by groundwater. Variation in trophic conditions over time is indicated by a vertical variability in the content of nitrogen, as well as by the Cladocera population. The strong decomposition of peat in the top layer of the mire, and increased concentrations of phosphorus and heavy metals, testify to increasing human activity during the most recent time periods.
    Źródło:
    Geological Quarterly; 2017, 61, 2; 305--318
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Climate change and human impact in the southern Baltic during the last millennium reconstructed from an ombrotrophic bog archive
    Autorzy:
    Lamentowicz, Mariusz
    Gałka, Mariusz
    Pawlyta, Jacek
    Lamentowicz, Łukasz
    Goslar, Tomasz
    Miotk-Szpiganowicz, Grażyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2026706.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Baltic bog
    last millennium
    multi-proxy
    Polska
    peatlands
    raised bog
    Opis:
    We pres ent the last mil len nium of his tory of a peatland lo cated in north ern Po land. Our re sults are based on two rep li - cate mono liths taken from a Bal tic raised bog. We ap plied a high-res o lu tion ap proach and ra dio car bon dat ing to the peat ma te rial to ob tain a de tailed palaeoenvironmental re con struc tion. To re con struct past peatland mois ture, we used three prox ies: tes tate amoe bae, plant macrofossils and pol len. De spite dif fer ent peat ac cu mu la tion and ex ten sive hi a tus in the for merly stud ied core, both mono liths show a sim i lar pat tern of changes. How ever, the core from this study pro - vides us with more de tailed data on S. fuscum dis ap pear ance which cor re lates well with the data from the other Bal tic bog, S³owiñskie B³oto. Our re search shows that pris tine Bal tic bogs can be dated to AD 1350. S³owiñskie B³oto palaeohydrology con firms AD 1300 as the be gin ning of the hy dro log i cal dis tur bance. In the case of the St¹¿ki and S³owiñskie B³oto bogs, the Lit tle Ice Age (LIA) is re corded be tween AD 1500 and AD 1800. How ever, this cli ma tic change might have been blurred by hu man im pact. In the case of the Bal tic bogs, their ref er ence vir gin state can be dated to AD 1200. Af ter this date, we ob served in creas ing hu man im pact and cli ma tic in sta bil ity con nected with the LIA. How ever, be tween AD 1800 and 1900, bogs were wet, most pos si bly due to cli ma tic forc ing. This fact sug gests that de spite hu man im pact, re cent peat de pos its can still re flect cli mate. Our re search pro vided in for ma tion re lated to the time of ex is tence, lo ca tion and char ac ter is tics of the nat u ral/pris tine state. High-res o lu tion peatland palaeo ec ol ogy is cru cial for res to ra tion ac tiv i ties, e.g., rewetting and en vi ron men tal man age ment. The palaeohydrological con text (sup ported by other prox ies) of the last 1000 years pro vides a re li able an swer to the ques tion: ‘To rewet or not to rewet?’
    Źródło:
    Studia Quaternaria; 2011, 28; 3-16
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in habitat conditions in a Late Glacial fluviogenic lake in response to climatic fluctuations (Warta River valley, central Poland)
    Autorzy:
    Forysiak, Jacek
    Okupny, Daniel
    Obremska, Milena
    Antczak-Orlewska, Olga
    Płóciennik, Mateusz
    Pawłowski, Dominik
    Baradyn, Daria
    Kotrys, Bartosz
    Luoto, Tomi P.
    Nevalainen, Liisa
    Borówka, Ryszard K.
    Powiązania:
    https://bibliotekanauki.pl/articles/13955341.pdf
    Data publikacji:
    2023
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    multi-proxy analysis
    Late Weichselian
    denudation processes
    palaeoclimate
    central European river
    Opis:
    The Warta River valley was greatly influenced by the ice sheet of the Last Glacial Maximum (LGM). A small peatland located in the Warta drainage system is here used as a palaeoarchive of climatic and habitat changes during the Late Glacial (Weichselian). The Ługi sediment profile was investigated using multi-proxy (pollen, Chironomidae, Cladocera and geochemistry) analyses that recorded changes in a fluviogenic sedimentary depression. After the Poznań Phase (LGM), Ługi functioned as an oxbow lake that was cut off from the active river channel as a result of fluvial erosion. Since that time, the Warta River has flowed only along the section now occupied by the Jeziorsko Reservoir. Sedimentation of lacustrine deposits started at the beginning of the Late Glacial. Summer temperature reconstructions indicate cool Oldest and Younger Dryas, but no clear cooling in the Older Dryas. During the Younger Dryas the palaeolake was completely occupied by a peatland (fen), which periodically dried out during the Holocene. Investigation of this site has tracked the reaction of the habitat to climatic, hydrological and geomorphological changes throughout the Late Weichselian.
    Źródło:
    Geological Quarterly; 2023, 67, 1; art. no. 1
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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