The biogeographical role of Pinus forest on the Northern Spanish Meseta: a new Holocene sequence |
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| Authors: | Mercedes García-Antón Fátima Franco-Múgica Carlos Morla-Juaristi Javier Maldonado-Ruiz |
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| Institution: | 1. Geological Institute, Russian Academy of Sciences, 7 Pyzhevskii pereulok, 119017 Moscow, Russia;2. Sun Yat-sen University, 135, Xingang Xi Road, Guangzhou 510275, PR China;1. Charles University in Prague, Faculty of Science, Department of Zoology, Vini?ná 7, CZ-128 44 Praha 2, Czech Republic;2. Charles University in Prague, Faculty of Science, Institute of Geology and Palaeontology, Albertov 6, CZ-128 43 Praha 2, Czech Republic;3. Steinmann Institute for Geology, Mineralogy and Palaeontology, Division Palaeontology, University of Bonn, Nussallee 8, D-53115 Bonn, Germany |
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| Abstract: | The aim of this paper is to reconstruct the variation in the vegetation during the Holocene on the Northern Meseta through pollen analysis in order to determine the roles played by Pinus and Quercus in the vegetation dynamics. A new pollen sequence, Camporredondo, in the centre of the Duero River basin, Northern Meseta, Spain, is presented. It covers the period from ca 11,250 to 1630 cal yr BP. The Camporredondo sequence suggests that a forested landscape existed from the start of the Holocene with values of approximately 90% of arboreal pollen mainly derived from pine forests in the surroundings. Shortly after 8600 cal yr BP pine forests continued to dominate but the landscape became more open while stands of deciduous and evergreen Quercus developed. Around 4500 years ago, coinciding with the start of a period of less rainfall, the lacustrine areas in these territories began to silt up, favouring hydrophytic taxa such as Salix or Cyperaceae. A comparison with other Holocene pollen sequences from the central-eastern part of the Northern Meseta confirms the presence of pine forests in the whole region since the early Holocene. We discuss the variations of the general vegetation pattern in terms of the local or regional conditions at each site. Throughout the Holocene, Pinus forests dominated at least in the eastern half of the Duero River basin. The typical Holocene substitution of conifers by broadleaf species as recorded in other parts of the Iberian Peninsula and Europe, never takes place in the study area. The results of the present study suggest that the current view of the potential vegetation in the Spanish Northern Meseta should be reviewed. |
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