Late Glacial to Holocene paleoenvironmental change on the northwestern Pacific seaboard, Kamchatka Peninsula (Russia)
| Autor: | Irina Yu Ponkratova, Hans Harmsen, Ionel Florin Pendea, Joanne Bourgeois, Ezra B.W. Zubrow, Maxim Portnyagin, Gregory Korosec, Vera Ponomareva |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
010506 paleontology
Archeology Global and Planetary Change 010504 meteorology & atmospheric sciences Betula ermanii biology Ecology Geology Vegetation 15. Life on land biology.organism_classification 38.37.25 Вулканология 01 natural sciences Subarctic climate 13. Climate action Glacial period Stadial Younger Dryas Tephra Ecology Evolution Behavior and Systematics Holocene 0105 earth and related environmental sciences |
| Popis: | We used a new sedimentary record from a small kettle wetland to reconstruct the Late Glacial and Holocene vegetation and fire history of the Krutoberegovo-Ust Kamchatsk region in eastern Kamchatka Peninsula (Russia). Pollen and charcoal data suggest that the Late Glacial landscape was dominated by a relatively fire-prone Larix forest-tundra during the Greenland Interstadial complex (GI 1) and a subarctic steppe during the Younger Dryas (GS1). The onset of the Holocene is marked by the reappearance of trees (mainly Alnus incana) within a fern and shrub dominated landscape. The Holocene Thermal Maximum (HTM) features shifting vegetational communities dominated by Alnus shrubs, diverse forb species, and locally abundant aquatic plants. The HTM is further defined by the first appearance of stone birch forests (Betula ermanii) – Kamchatka's most abundant modern tree species. The Late Holocene is marked by shifts in forest dynamics and forest-graminoid ratio and the appearance of new non-arboreal taxa such as bayberry (Myrica) and meadow rue (Filipendula). Kamchatka is one of Earth's most active volcanic regions. During the Late Glacial and Holocene, Kamchatka's volcanoes spread large quantities of tephra over the study region. Thirty-four tephra falls have been identified at the site. The events represented by most of these tephra falls have not left evidence of major impacts on the vegetation although some of the thicker tephras caused expansion of grasses (Poaceae) and, at least in one case, forest die-out and increased fire activity. |
| Databáze: | OpenAIRE |
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