scholarly journals Fauna und Flora im Pleistozän-Profil von Murg bei Säckingen und ihre Aussage zur Altersdatierung

1964 ◽  
Vol 15 (1) ◽  
pp. 164-180
Author(s):  
Ekke W. Guenther ◽  
Fritz Tidelski
Keyword(s):  
Plant Community ◽  
Climatic Conditions ◽  
Cold Period ◽  
Peat Bog ◽  
Ground Moraine ◽  
Pollen Spectrum ◽  
Black Forest ◽  
Soil Horizons ◽  
Stratigraphic Sequence ◽  
Glacial Stage

Abstract. The Murg profile shows a loamy ground moraine as the lowermost Pleistocene layer over gneis. The moraine originated during the furthest thrust of the Alpine glaciers in the direction of the Black Forest, and has been placed since 1909 (according to the work of Penck and Brückner) in the Riss glacial stage. Overlying the moraine are pollenbearing peat bog and pond deposits. The pollen indicate, in the deepest layers, a plant community that might still be possible under present climatic conditions. In the higher layers, the trees having affinities to warm conditions disappear. The composite diagram (pollen spectrum) indicates the end phase of an interglacial stage. Over these sediments lie 6—10 m of loess and loess-loam deposits. A thick loam layer, averaging 2.50 m in width, which contains more or less distinct soil horizons, lies between aeolian loess, which always represents a cold period. It can thus be proved that at least a part of these substrata originated in place. Since this loam horizon also represents a warm phase, the deposits of two warm periods overlie the Riss moraine in the Murg profile. Remains of elephants, giant stags, and bison permit comparison of the Murg stratigraphic sequence with a portion of the profile at Achenheim near Strassburg. Hereby is shown that merely the warm period, between the moraine formation and the lowest loess at Murg, can correspond to layers at Achenheim which have yielded the last ancient elephant (Palaeoloxodon antiquus Falc.). These are approximately of the same age as the travertine at Ehringsdorf The pollen-bearing sectionat Murg might then probably be included in the time of formation of the upper travertine at Ehringsdorf.

Late Tertiary to late Quaternary record in the Mackenzie Mountains, Northwest Territories, Canada: stratigraphy, paleosols, paleomagnetism, and chlorine - 36

1996 ◽  
Vol 33 (6) ◽  
pp. 875-895 ◽  
Author(s):  
A. Duk-Rodkin ◽  
R. W. Barendregt ◽  
C. Tarnocai ◽  
F. M. Phillips
Keyword(s):  
Late Quaternary ◽  
Ice Sheet ◽  
Climatic Conditions ◽  
Unconsolidated Sediments ◽  
Laurentide Ice Sheet ◽  
Stratigraphic Sequence ◽  
Late Tertiary ◽  
Mackenzie Mountains ◽  
Late Wisconsinan ◽  
Stratigraphic Succession

A stratigraphic sequence of unconsolidated sediments ranging in age from Late Pliocene to Late Pleistocene is recorded in the Canyon Ranges of the Mackenzie Mountains. Three of the sections (Katherine Creek, Little Bear River, and Inlin Brook) expose bedrock and Tertiary gravel overlain by colluvium and a multiple till sequence of montane origin, separated by paleosols and capped by a till of Laurentide origin. The sections are correlated on the basis of lithology, paleosol development, paleomagnetism, and chlorine dating of surface boulder erratics. A formal stratigraphic nomenclature is proposed for the deposits of this region. The sequence of glacial tills separated by paleosols reflects a long record of glacial–interglacial cycles. Soil properties from the oldest paleosol to modern soil show a general decrease in the degree of soil development, suggesting a progressive deterioration of interglacial climatic conditions. A normal–reverse–normal sequence of remanent magnetization was determined within the stratigraphic succession and assigned to the Gauss–Matuyama–Brunhes chrons, respectively. A Gauss age was assigned to the basal colluvium, an early Matuyama age (including Olduvai) to the first two tills, and a Brunhes age to the last three tills. Laurentide deposits are of Late Wisconsinan age and are restricted to the uppermost part of the stratigraphic succession. Chlorine dates for surface boulders place the all-time limit of the Laurentide Ice Sheet at about 30 ka. The Late Wisconsinan Laurentide Ice Sheet was the only continental ice to reach the Mackenzie and Richardson mountains of the northern Cordillera.

The Holocene evolution of permafrost near the tree line, on the eastern coast of Hudson Bay (northern Quebec)

1987 ◽  
Vol 24 (11) ◽  
pp. 2206-2222 ◽  
Author(s):  
Michel Allard ◽  
Maurice K. Seguin
Keyword(s):  
Climatic Conditions ◽  
Snow Accumulation ◽  
Eastern Coast ◽  
Permafrost Degradation ◽  
Tree Line ◽  
Stratigraphic Sequence ◽  
Forest Tundra ◽  
Discontinuous Permafrost ◽  
Shrub Tundra ◽  
Peat Plateaus

Permafrost evolution in postglacial marine silts near the tree line was reconstructed using landform analysis, 14C dating, and palynostratigraphic analysis of peat sections. In the forest–tundra, below the tree line, four sites in peat plateaus have a stratigraphic sequence indicating an alluvial plain environment from 6000 to 4800 BP followed by a wetland supporting trees and shrubs with deep snow accumulation and without permafrost. Ground heave occurred between 1900 and 1200 BP as peat plateaus and palsas were formed. In the shrub–tundra, above the tree line, three permafrost sites with buried peat beds suggest that climatic conditions were cold enough for discontinuous permafrost in the surrounding landscape starting from land emergence, about 5800 BP; however, fen expansion and sedge peat accumulation continued over unfrozen ground until 2300, 1560, and 1400 BP. At these dates, the sites were buried with silt, probably as a result of mass wasting on nearby permafrost mounds and then permafrost aggraded under the sites. Generally, the palynostratigraphic data reflect a marked cooling of climate starting by 3200–2700 BP and culminating in a major period of permafrost aggradation between 1900 and 1200 BP. Permafrost degradation has been dominant since then despite other possible cold intervals. Nowadays, the permafrost in marine silts is twice as thick and three times more widespread in the shrub–tundra than in the forest–tundra.

Fate of calcite, apatite and feldspars in an ombrotrophic peat bog, Black Forest, Germany

2006 ◽  
Vol 163 (4) ◽  
pp. 641-646 ◽  
Author(s):  
Gaël Le Roux ◽  
Emmanuel Laverret ◽  
William Shotyk
Keyword(s):  
Peat Bog ◽  
Black Forest ◽  
Ombrotrophic Peat

scholarly journals Seasonal and multiannual dynamics of sedentary species populations of hunting interest

2021 ◽  
Author(s):  
Anatol Savin ◽  
◽  
Oleg Ciocoi ◽  
Mihail Scerbliuc ◽  
Gheorghe Grosu ◽  
...  
Keyword(s):  
Reproductive Period ◽  
Climatic Conditions ◽  
Cold Period ◽  
Game Species ◽  
Vegetative Period ◽  
Grey Partridge ◽  
Small Game ◽  
Arid Conditions ◽  
Offspring Growth ◽  
Number Dynamics

The aim of the research was to study the number dynamics of the populations of dominant sedentary species of hunting interest as a theoretical context in arguing sustainable measures for the management of economic interest fauna. The studies between 2000-2021 shows that after a period of depression in the populations of sedentary species of hunting interest in 2004-2012 there is an increase from 2016-2017 till present of reproductive stocks in all studied species on average by 95%. The losses in the cold period of the year varied depending on the climatic conditions of the cold period of the year, as well as the age structure at the end of the reproductive period: for the hare between 14% and 30%, with an average of 23%; in grey partridge from 56% to 71% and in pheasant they fluctuate between 48% and 56% of the autumn number, being lower in warm winters (37%). Analyzing the dynamics of annual increases in sedentary small game species in different climatic conditions, it was found that arid conditions during nesting and offspring growth, decrease annual increases by 143% in pheasants, 122% in hares, and only 74% in partridges, which is a species less dependent on aridizations in the vegetative period.

13C CP/MAS-NMR spectra of organic matter as influenced by vegetation, climate, and soil characteristics in soils from Murcia, Spain

2002 ◽  
Vol 82 (4) ◽  
pp. 403-411 ◽  
Author(s):  
A. Faz Cano ◽  
A R Mermut ◽  
R. Ortiz ◽  
M B Benke ◽  
B. Chatson
Keyword(s):  
Organic Matter ◽  
Functional Groups ◽  
Plant Community ◽  
Nmr Spectra ◽  
Climatic Conditions ◽  
Parent Material ◽  
Mas Nmr ◽  
Soil Parameters ◽  
Organic C ◽  
Cp Mas Nmr

Soils in southern Spain are low in organic matter (OM) and nutrients. Understanding the nature and dynamics of OM has potential to improve soil management technologies for sustainable crop production. The objective of this work was to establish the distribution of functional groups in organic-C from these soils using 13C CP/MAS-NMR spectroscopy and to investigate the influence of vegetation, climatic conditions, soil parameters, parent material, and soil order on these functional groups. No statistically significant variability in the distribution of organic-C groups was found as a result of the influence of either soil order or parent material. The content of O-alkyl-C in the soils under the Rhamno-Quercetum plant community was higher (95% probability) than in the soils under the Paronychio-Sideritidetum plant community. Soils located in the mesomediterranean climatic zone displayed a higher content of O-alkyl-C and a lower content of aromatic-C compared to the soils located in the thermomediterranean zone. These differences were statistically significant at 95% of probability. Vegetation and climatic conditions appear to play a major role in the OM decomposition processes in this region. Statistically significant and positive correlations were found between alkyl-C and both cation exchange capacity (CEC) and clay content indicating the recalcitrant nature of these organic compounds. Key words: Organic matter composition, Spanish soils, 13C CP/MAS-NMR spectra, Mediterranean soils, Alfisols, Mollisols, Aridisols

scholarly journals Evaluation of the growth and health status of selected clone mixtures in comparison with ordinary planting stock

2010 ◽  
Vol 56 (No. 7) ◽  
pp. 314-322
Author(s):  
J. Leugner ◽  
A. Jurásek ◽  
J. Martincová
Keyword(s):  
Chlorophyll Fluorescence ◽  
Physiological State ◽  
Growth Dynamics ◽  
Climatic Conditions ◽  
Peat Bog ◽  
Good Growth ◽  
Site Conditions ◽  
Water Losses ◽  
Partial Data ◽  
To Come

The present paper compares the growth of parent trees and potentially stress-tolerant mixtures of clones of Norway spruce (Picea abies [L.] Karst.) progenies coming from a specific locality near the Čern&aacute; hora peat bog in the Krkono&scaron;e Mts. Growth was studied in generative ortet plantations in Trutnov locality and in a mountain ortet plantation Lesn&iacute; bouda, in the 1<sup>st</sup> generation clone plantation Benecko and in the 2<sup>nd</sup> generation clone plantation in the Černohorsk&aacute; ra&scaron;elina locality. In the latter locality chlorophyll fluorescence and water losses during controlled desiccation were also measured in selected clones compared to control (generatively propagated) spruces. Partial data acquired until now prove the good growth dynamics and physiological state of some clones in extreme climatic conditions indicating that cuttings were taken from vital parent trees growing in exposed mountain localities. Growth relations among the clones were identical in all evaluated localities. The growth of the 2<sup>nd</sup> generation clone plantation has been markedly influenced by plantation and specific site conditions until now. The mutual interaction of clone growth and site conditions can change in time and therefore the study of clone plantations will continue in the years to come.

scholarly journals Three millennia of vegetation and environmental dynamics in the Lagunas de Mojanda region, northern Ecuador

2017 ◽  
Vol 57 (2) ◽  
pp. 407-421 ◽  
Author(s):  
Andrea Villota ◽  
Hermann Behling ◽  
Susana León-Yánez
Keyword(s):  
Vegetation Type ◽  
Montane Forest ◽  
Climatic Conditions ◽  
Climate Dynamics ◽  
Peat Bog ◽  
Pollen Record ◽  
Vegetation Composition ◽  
Human Occupation ◽  
Vegetation And Climate ◽  
Montane Rainforest

AbstractThe pollen record from Lagunas de Mojanda, located at 3748 m a.s.l. (northern Ecuadorian Andes) reflects the vegetation and climate dynamics for the last ca 3400 cal yr BP. Páramo vegetation has been the main vegetation type since the beginning of the record. At Lagunas de Mojanda, from the last ca 3400 to 2200 cal yr BP, grass páramo was well represented mainly by Poaceae (40%) and the occurrence ofValeriana(5%), while montane forest taxa were poorly represented and subpáramo taxa were rare. The vegetation composition suggests cool and humid conditions. Between ca 2200 and ca 1300 cal yr BP, montane rainforest and subpáramo taxa had a higher presence but páramo taxa remained the main vegetation type in the study area, suggesting cool climatic conditions. From ca 1300 to ca 500 cal yr BP, páramo vegetation remained stable, with higher presence ofPhlegmariurusandIsoetes, suggesting cool and humid conditions. The last ca 500 cal yr BP generally show lower frequency of montane rainforest and subpáramo taxa. Páramo vegetation reached the highest share, with the presence of Poaceae,PlantagoandRanunculussuggesting a trend of peat bog drying. Fires were present during the whole record, perhaps human-caused, but the study area does not show great disturbance except from ca 1300 to 500 cal yr BP, a period of an evident higher influx of charcoal particles coincidentally with nearby ancient human occupation.

Warm Period Growth of Travertine during the Last Interglaciation in Southern Germany

2000 ◽  
Vol 54 (1) ◽  
pp. 38-48 ◽  
Author(s):  
Norbert Frank ◽  
Margarethe Braum ◽  
Ulrich Hambach ◽  
Augusto Mangini ◽  
Günther Wagner
Keyword(s):  
Mass Spectrometry ◽  
Chemical Composition ◽  
Growth Rates ◽  
Activity Ratio ◽  
Late Quaternary ◽  
Ice Core ◽  
Spring Water ◽  
Peat Bog ◽  
Stratigraphic Sequence ◽  
Cold Episode

Late-Quaternary travertine at two sites near Stuttgart formed entirely during interglacial periods. The travertine contains structures from growth induced by bacteria, and such structures have been dated by 230Th/U mass spectrometry. The resulting ages from both sites imply growth episodes of short duration, with growth rates up to 5 mm yr−1, at 99,800 ± 1300 yr B.P. (2σ n = 8) and 105,900 ± 1300 yr B.P. (2σ n = 7). These episodes were likely part of marine isotope stage (MIS) 5.3. Deposition of silt interrupted travertine growth at one of the sites ∼105,000 yr B.P. Likely correlatives of this silt are the St. Germain I-B stade recorded in the Grand Pile peat bog and a cold episode ∼1000 yr long recorded by δ18O values in the GRIP ice core. Travertine also formed during stage 5.5 (∼115,000 yr) and during the early Holocene. We found no evidence for travertine accumulation in stages 2, 3, 4, and 5.1. At both sites, the Sr/U ratio and the initial 234U/238U activity ratio resemble those of modern spring water. However, the sites differ in the chemical composition of spring water and in stratigraphic sequence of travertine accumulation.

Origin and fluxes of atmospheric REE entering an ombrotrophic peat bog in Black Forest (SW Germany): Evidence from snow, lichens and mosses

2006 ◽  
Vol 70 (11) ◽  
pp. 2815-2826 ◽  
Author(s):  
Dominique Aubert ◽  
Gaël Le Roux ◽  
Michael Krachler ◽  
Andriy Cheburkin ◽  
Bernd Kober ◽  
...  
Keyword(s):  
Peat Bog ◽  
Black Forest ◽  
Ombrotrophic Peat

scholarly journals Preliminary paleoenvironmental analysis of permafrost deposits at Batagaika megaslump, Yana Uplands, northeast Siberia

2017 ◽  
Vol 87 (2) ◽  
pp. 314-330 ◽  
Author(s):  
Julian B. Murton ◽  
Mary E. Edwards ◽  
Anatoly V. Lozhkin ◽  
Patricia M. Anderson ◽  
Grigoriy N. Savvinov ◽  
...  
Keyword(s):  
Fine Sand ◽  
Climatic Conditions ◽  
Stratigraphic Sequence ◽  
Oxygen Isotope Stage ◽  
Mis 3 ◽  
Eolian Sand ◽  
Sand Sheet ◽  
Mis 5 ◽  
Paleoenvironmental Analysis ◽  
Key Questions

AbstractA megaslump at Batagaika, in northern Yakutia, exposes a remarkable stratigraphic sequence of permafrost deposits ~50–80 m thick. To determine their potential for answering key questions about Quaternary environmental and climatic change in northeast Siberia, we carried out a reconnaissance study of their cryostratigraphy and paleoecology, supported by four rangefinder 14C ages. The sequence includes two ice complexes separated by a unit of fine sand containing narrow syngenetic ice wedges and multiple paleosols. Overall, the sequence developed as permafrost grew syngenetically through an eolian sand sheet aggrading on a hillslope. Wood remains occur in two forest beds, each associated with a reddened weathering horizon. The lower bed contains high amounts of Larix pollen (>20%), plus small amounts of Picea and Pinus pumila, and is attributed to interglacial conditions. Pollen from the overlying sequence is dominated by herbaceous taxa (~70%–80%) attributed to an open tundra landscape during interstadial climatic conditions. Of three hypothetical age schemes considered, we tentatively attribute much of the Batagaika sequence to Marine Oxygen Isotope Stage (MIS) 3. The upper and lower forest beds may represent a mid–MIS 3 optimum and MIS 5, respectively, although we cannot discount alternative attributions to MIS 5 and 7.

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