scholarly journals New results of a palynological study of the Lake Doroninskoe sediments (Eastern Siberia, Transbaikalia)

2022 ◽  
Vol 962 (1) ◽  
pp. 012033
Author(s):  
S A Reshetova
Keyword(s):  
Bottom Sediments ◽  
Pollen Analysis ◽  
Meromictic Lake ◽  
Sediment Layer ◽  
Eastern Siberia ◽  
Modern Times ◽  
Middle Holocene ◽  
Time Period ◽  
Palynological Study

Abstract This article presents the results of the study of the bottom sediments of the meromictic Lake Doroninskoe. For the study, the method of spore-pollen analysis was used. The record showed that during the accumulation of 65 cm of the sediment layer in the Chita-Ingodinskaya depression, pine and larch predominated along the ridges, with steppe and meadow associations in the lower parts of the depression. According to regional correlations, the distribution of light-coniferous-taiga vegetation in Transbaikalia occurred as early as the Middle Holocene, and it did not undergo cardinal changes until modern times. According to these data, sediments may have accumulated during this time period.

scholarly journals Upper Holocene development of vegetation and radiocarbon dating in the vicinity of the Cerhovka Brook (Bohemian-Moravian Uplands, Czech Republic)

2012 ◽  
Vol 39 (4) ◽  
pp. 252-261 ◽  
Author(s):  
Eva Břízová ◽  
Anna Pazdur ◽  
Natalia Piotrowska
Keyword(s):  
Czech Republic ◽  
Pollen Analysis ◽  
Radiocarbon Dating ◽  
Deciduous Forests ◽  
Peat Bog ◽  
The Holocene ◽  
Lime Tree ◽  
Stratigraphic Position ◽  
Palynological Study ◽  
Pollen Analyses

Abstract The paper reports the results of a palynological study of a newly exposed section in the peat sediments of Bezděkov site and its correlation with the previous palaeobotanical studies. The main goal was to elucidate the stratigraphic position and paleogeographic development of fossil peat bog and its environment in the Protected Landscape Area Žďárské vrchy and Železné hory in the Bohemian-Moravian Uplands. The development of peatbog vegetation, as shown by the pollen analysis and radiocarbon dating, took place in the Holocene. Pollen analyses provide evidence for occurrences of wetland assemblages with huge representation of alder wood in all the part of succession, followed by willow near the Cerhovka Brook. Alnus and Abies were the dominant trees during all the time. The deciduous forests consist of elm (Ulmus), oak (Quercus), lime tree (Tilia), maple (Acer) and hazel (Corylus). The mosaic picture of woodland and wetland, which covered this landscape during the Upper Holocene, contrasts with the present day monotonous open lowland. Sediments of the peat bog provide information on the origin and vegetation evolution of this area.

Mercury in bottom sediments of the Amur River, its flood-plain lakes and estuary, Eastern Siberia

2009 ◽  
Vol 168 (1-4) ◽  
pp. 133-140 ◽  
Author(s):  
Fyodor S. Kot ◽  
Konstantin G. Bakanov ◽  
Nikolay A. Goryachev
Keyword(s):  
Bottom Sediments ◽  
Flood Plain ◽  
Eastern Siberia ◽  
Amur River ◽  
The Amur River

scholarly journals Environmental changes in last 200 years from results of bottom-sediments analysis of lake Oron (Kodar ridge, Eastern Siberia, Russia)

2019 ◽  
Vol 46 (4) ◽  
pp. 447-456
Author(s):  
I. V. Enushchenko
Keyword(s):  
Bottom Sediments ◽  
Environmental Changes ◽  
Environmental Studies ◽  
Eastern Siberia ◽  
Thick Sample ◽  
Climate Effect ◽  
Chironomidae Larvae ◽  
Regional Landscape

Records of bottom sediments accumulated in Lake Oron over the last 200 years were analyzed. Chironomidological and palynological examinations of Lake Oron bottom sediments, based on a 10-cm-thick sample from drilling, were conducted. The dynamic climate effect on fauna was studied by examination of Chironomidae larvae from the lake. The lake’s hydrological status and the local and regional landscape and vegetation were also determined. As a result of these environmental studies, the effect of Lake Oron’s nearshore conversion to bog on the process of the lake water’s acidification was assumed, and the approximate dates of the process were defined as beginning in the 1940s.

CHRONOLOGY OF CONTEMPORARY SEDIMENTATION AND POLLUTANTS ACCUMULATION IN THE BOTTOM SEDIMENTS OF THE SEA OF AZOV

2017 ◽  
Author(s):  
Andrey Kuznetsov ◽  
Andrey Kuznetsov ◽  
Yury Fedorov ◽  
Yury Fedorov ◽  
Paul Fattal ◽  
...  
Keyword(s):  
Bottom Sediments ◽  
Anthropogenic Impact ◽  
Specific Activity ◽  
Sediment Cores ◽  
Anthropogenic Pressure ◽  
Layer By Layer ◽  
Sediment Layer ◽  
Sea Of Azov ◽  
The Sea Of Azov ◽  
Don River

Bottom sediments formed in the water bodies under the technogenic impact are important environmental factors affecting water quality and hydrobiota. Usually they consist of natural and technogenic material and differ from natural formations by their morphology, chemical and lithological composition, physicochemical and biochemical properties. In the present paper we use the term “sediment layer of anthropogenic impact” to define the sediment layer containing technogenic material and/or chemical pollutants. The determination of its location in the sediment cores, its thickness and accumulation chronology is an important scientific problem. In the paper the results of layer by layer study of Cs-137, Am-241, Pb-210 specific activities as well as concentrations of petroleum components, lead and mercury in 48 sediment cores of the Sea of Azov and the Don River are examined. The sediment core layers are dated by radiological methods. In all the sediment cores the peak of Cs-137 specific activity related to the Chernobyl accident was detected. In the Sea of Azov, this peak is located in the upper sediment layer up to 10 cm thick, however, in the delta and in the near-delta part of the Don River, where the sedimentation rates are more important, it is found at 20 to 40 cm depth. Also in certain sediment cores the second peak of Cs-137 related to the global nuclear fallout of the 1960s was found. The most of petroleum components, lead and mercury quantities are concentrated in the upper sediment layer formed in the last 50 to 70 years, i.e. in the period of the most important anthropogenic pressure. So, this complex approach based on the data on the vertical distribution of technogenic radionuclides and common pollutants in the sediment cores made it possible to identify and delineate the sediment layer of high anthropogenic impact as well as to assess the duration of this impact.

Reconstruction of Precipitation in Morocco Since 1100 A.D. Based on Cedrus Atlantica Tree-Ring Widths

1990 ◽  
Vol 33 (3) ◽  
pp. 337-351 ◽  
Author(s):  
Claudine Till ◽  
Joël Guiot
Keyword(s):  
Tree Ring ◽  
Arid Regions ◽  
Bootstrap Method ◽  
Ring Width ◽  
Modern Times ◽  
Cedrus Atlantica ◽  
Time Period ◽  
Precipitation Variation ◽  
The Bootstrap Method ◽  
Past 1000 Years

AbstractAnnual (October through September) precipitation from 1100 A.D. to modern times is reconstructed for Morocco, using Cedrus atlantica (Endl.) Carrière tree-ring chronologies. Both multiple regression on principal components and the bootstrap method are use to calibrate tree-ring width with precipitation; precipitation variation is reconstructed for three climatically distinct areas: the humid, subhumid, and arid regions of Morocco. A series of successive wet and dry periods is identified for the past 1000 years; the maximum length of the 13 dry periods (during which precipitation was at least 1σ below normal) is 6 years. Twenty-one years are identified during which precipitation fell more than 2σ below normal. We are unable to identify significant correspondence in climatic variation in Morocco, Europe, and the Sahel during this time period.

Spatio-temporal patterns of cemetery use among Middle Holocene hunter-gatherers of Cis-Baikal, Eastern Siberia

2021 ◽  
Vol 25 ◽  
pp. 100253
Author(s):  
C. Bronk Ramsey ◽  
R.J. Schulting ◽  
V.I. Bazaliiskii ◽  
O.I. Goriunova ◽  
A.W. Weber
Keyword(s):  
Temporal Patterns ◽  
Eastern Siberia ◽  
Hunter Gatherers ◽  
Middle Holocene ◽  
Spatio Temporal
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