| Institution: | 1. Department of Forestry, Faculty of Natural Resources, Urmia University, Urmia, Iran
Faculty of Mathematics and Natural Sciences, Institute of Prehistoric and Protohistoric Archaeology, Christian-Albrechts-Universität zu Kiel, Kiel, Germany;2. Department of Forestry, Faculty of Natural Resources, Urmia University, Urmia, Iran;3. Institut Méditerranéen de Biodiversité et d'Ecologie marine et continentale, Aix Marseille Univ, CNRS, IRD, Avignon Université, Europôle Méditerranéen de l'Arbois, Aix-en-Provence, France;4. Neptune Isotope Laboratory (NIL), Department of Marine Geosciences, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, USA;5. Department of Plant Biology, Faculty of Basic Sciences, University of Mazandaran, Babolsar, Iran |
| Abstract: | Palynological and geochemical analyses provide valuable information about modern and past climatic regimes and vegetation. The impact of climate and humans on past vegetation in the semi-arid areas of northwestern Iran has received increased interest in the wake of warming temperatures in the Middle East. Palynological and down-core XRF elemental abundances from a peat core from Lake Neor enabled a reconstruction of vegetational changes of the past 7000 years over the highlands of northwestern Iran. Periods of increased arboreal pollen (AP) types and high (Artemisia + Poaceae)/Chenopodiaceae ratios along with low titanium abundances, high percentages of total organic carbon, more negative δD values, and higher carbon accumulation rates suggest a relatively wet climate. These conditions have persisted during the periods 6700–6200, 5200–4450 and 3200–2200 cal a bp. The overall low AP values, substantial rise of Chenopodiaceae, high Ti abundances and low values of palaeo-redox proxies, are all evidences of a drier climate, as has been reconstructed for the periods 6200–5200 and 4030–3150 cal a bp and the last 2200 years. An important feature of the last centuries is the increase of anthropogenic and pastoral indicator pollen types. Our results may provide basic data to predict future trends in vegetation dynamics under future climate change in western Asia. |
