PRELIMINARY STUDY ON SURFACE POLLEN FLORA IN THE LONGCHI MOUNTAIN NATURE RESERVE,YIXING,JIANGSU PROVINCE
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Abstract:
This paper analyzes the pollen and spores of eight moss samples collected from the Longchi Mountain Nature Reserve,Yixing,Jiangsu Province.The surface pollen flora is dominated by Quercus,Pinus,Cyclobalanopsis,Castanopsis/Lithocarpus and Castanea,mixed with Liquidambar,Myrica,Ilex,Nyssa,Rhus,Ulmus,Juglans,Betula and Pterocary,etc.Herbaceous pollen and fern spores are common,mainly represented by Poaceae,Artemisia as well as Polypodiaceae type,respectively.Two pollen zones with an altitude boundary of 200m above sea level are recognized based on the variations of some important taxa.Our results show that the pollen flora generally reflects the main components and distribution along the Longchi hill of the current zonal evergreen broad-leaved forests,though there are some discrepancies.In addition,we integrate the pollen flora with other representative surface pollen data from the Yangtze River Delta to propose several pollen signal proxies for better identifying the subtropical evergreen forest type,the mixed deciduous-evergreen broad-leaved forest pattern and the human-disturbed deciduous broad-leaved forest type.The results will provide important and improved information for the study of Quaternary paleovegetation and paleoclimate in the Yangtze River Delta areas.
