Ancient pine forest on inland dunes in the Spanish northern meseta
| Autor: | Fátima Franco-Múgica, Helios Sainz-Ollero, Mercedes García-Antón, Javier Maldonado-Ruiz, Carlos Morla-Juaristi |
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| Rok vydání: | 2005 |
| Předmět: |
Mediterranean climate
010506 paleontology geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Cupressaceae biology Ecology medicine.disease_cause biology.organism_classification 01 natural sciences Sand dune stabilization Arts and Humanities (miscellaneous) Peninsula Aridification Pollen visual_art medicine visual_art.visual_art_medium General Earth and Planetary Sciences Charcoal Holocene Geology 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Quaternary Research. 63:1-14 |
| ISSN: | 1096-0287 0033-5894 |
| DOI: | 10.1016/j.yqres.2004.08.004 |
| Popis: | We present a new stratigraphic (pollen and nonpollen microfossils and charcoal particle) sequence with five AMS dates, covering about the last 9000 yr, of a core collected from the Spanish northern meseta, one of the territories of the Iberian Peninsula for which little paleobotanical information is available. The results support the hypothesis of the permanence of the pine forests, in more or less pure masses or large timber stands, during the Holocene in some Iberian continental zones. The typical substitution in postglacial dynamics of heliophyllous species, such as pines or Cupressaceae, by broadleaf trees did not occur in this inland region. Presumably, factors linked to the substrate, in this case very deep sand dunes covering vast areas, may have contributed to the scarce local competitiveness of the broadleaf trees, which would account for the hegemony of pines in this region. Based on the dynamics of aquatic plants and nonpollen microfossils, an initial phase previous to 750014C yr B.P. of high levels in the lake can be identified by high percentages of hydrophytes. A progressive increase in helophytes and the gradual infilling of the lake over the last 5000 yr appear to indicate a phase of aridification similar to those established for the western Mediterranean. Study of charcoal particles, more abundant in the last 2500 yr, has given rise to certain hypotheses regarding the incidence of recurring fires of a local or regional nature. |
| Databáze: | OpenAIRE |
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