Podrobnosti záznamu

    Changes in vegetation of the Černé Lake area inferred from pollen analysis of lake sediment: period between 3400 BC and 1600 AD
Údaj o odpovědnosti
    Josef Veselý
Další názvy
    Změny vegetace v širším okolí Černého jezera v období mezi 3400 př.n.l. a 1600 n.l.
    Veselý, Josef
Zdrojový dokument - seriál
    Silva Gabreta : sborník vědeckých prací ze Šumavy
    Roč. 2
    s. 141-153
    5 obr., 4 s.bibl.
    Zkr. název ser.: Silva Gabreta
Předmětová skupina
    datování C14
    kvartér Českého masivu
    sedimentace lakustrinní
    změna klimatu
Geografické jméno
    Černé jezero (Klatovy)
Klíčové slovo
Abstrakt (anglicky)
   Pollen were analyzed along a 1.15 m long profile of lacustrine sediments of the Černá Lake in Bohemian Forest, Czech Republic. The oldest sediment layer (from about 3300 BC) contained the highest proportion of the Ulmus pollen and a large amount of the pollen of Corylus. A strong increase of Picea and Abies around 3100 BC was probably caused by abrupt short cooling of the climate. Between 3100 and 2200 BC the area of the Černé Lake was forested mostly by Picea, Abies, Alnus, Betula and Fagus. The population of Fagus and Abies gradually increased while Picea, Ulmus, Corylus and Acer retreated. An exogenous disturbance in the lake catchment affected the forest around 2600 BC and subsequently Picea with Abies retreated remarkably. The following period led to the invasion of deciduous trees (mostly Fraxinus, Alnus, Tilia and Corylus). A wetting of climate around 800 BC was accompanied by a retreat of Quercus. Repeated afforestation took place in the early AD centuries.
   The presence of Gramineae (Poaceae) increased from about 2400 BC to the end of the old era. Ruderal plants were observed in the whole investigated period, while Cerealia since about 2700 BC. Cultivation of rye (Cerealia t. Secale) became common earlier (from 10th century AD) than cultivation of wheat (Cerealia T. Triticum). The occurrence of herbs (NAP) systematically increased from the 12th century AD, but enhanced penetration of sunshine to the forest floor was already indicated around 200 BC and in the 10th century AD. Strong disturbance of forest by man after 1250 AD was accompanied by a remarkable and permanent decrease in Fagus, especially in the 14th and the 15th century. This was also connected with iron industry around the Černé Lake, mining being documented as early as in 1525 AD. Nutrients introduced into the lake during an erosion around 2600 BC caused a rapid growth of algae Botryococcus sp., eutrophization and worsened the light conditions in the lake epilimnon.
   This probably hindered the growth of Isoetes lacustris
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
Datum vložení
    7. 3. 2008
Datum importu
    8. 8. 2012