Environmental history and vegetation dynamics in response to climate variations and human pressure during the Holocene in Bassa Nera, Central Pyrenees
| Autor: | Joan Manuel Soriano, Oriol Andreu, Teresa Vegas-Vilarrúbia, Albert Pèlachs, Núria Cañellas-Boltà, Aaron Pérez-Haase, Ramón Pérez-Obiol, Nil Escolà, Sandra Garcés-Pastor, Miguel-Angel Calero |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010506 paleontology
geography Peat geography.geographical_feature_category 010504 meteorology & atmospheric sciences biology Ecology Lake ecosystem Drainage basin Paleontology Ecotone Oceanography biology.organism_classification 01 natural sciences Sphagnum Deciduous Ecosystem Physical geography Ecology Evolution Behavior and Systematics Holocene Geology 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Palaeogeography, Palaeoclimatology, Palaeoecology. 479:48-60 |
| ISSN: | 0031-0182 |
| DOI: | 10.1016/j.palaeo.2017.04.016 |
| Popis: | With the aims of investigating the causes of environmental changes in high mountain ecosystems during the Holocene in relation to climate forcings and identifying thresholds for vegetation community shifts, we performed a multi-proxy palaeoecological reconstruction based on two sediment cores from Bassa Nera, a lentic system located close to the montane–subalpine ecotone in the Central Pyrenees. Using pollen, plant macroremains, charcoal, chemical elements and loss-on-ignition at centennial to decadal resolution, we reconstructed the vegetation and lacustrine dynamics during the last 10,000 years. A montane pollen ratio was used as a palaeoecological indicator to track altitudinal shifts in high mountain vegetation, which was compared to the ice-rafted debris index (IRD) as a proxy for summarizing the climatic influence of the North Atlantic Circulation. Our results show upward shifts of deciduous forest and its presence in Bassa Nera from the onset of the Holocene until 4200 cal yr BP, when it was replaced by coniferous taxa. The montane ratio showed a link between vegetation and North Atlantic influence, while changes in Sphagnum macroremains and aquatic taxa allowed description of local ontogenic changes from the initial pond to the present peatland. The loss-on-ignition record showed some flood events at Bassa Nera between 4500 and 3900 cal yr BP. The studied proxies allowed inferences concerning anthropic pressure in the catchment through grazing activities by 7300 cal yr BP and the appearance of cereal agriculture around 5190 cal yr BP. The highest human pressure occurred in the late Bronze Age, Roman Period and Middle Ages. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect