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《Chinese Journal of Eco-Agriculture》 2008-02
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Characteristics of spore-pollen and ancient climate changes in inlands of Northwest China

SHEN Jian-Mei1, ZHANG Guang-Hui1, NIE Zhen-Long1, WANG Jin-Zhe1,YAN Ming-Jiang1, ZHANG Jun-Pai1, GUO Rui-Lin2(1.Institute of Hydrogeology and Environmental Geology, Academy of Geological Sciences,Shijiazhuang 050061, China; 2.No.4 Geological Team of Hebei Province, Chengde 067000, China)  
Spore-pollen analysis of Pleistocene—Holocene in Yanchi diggings of Gansu shows that the oldest profile is 12.5~16.0ka. Based on spore-pollen characteristics, 27 families and genus are found along the profiles, 10 of which are xylophytes, 15 are herbs, and 2 are pteridophytes. The Pleistocene—Holocene spore-pollen is divided into four composition categories. The spore-pollen composition shows that paleoclimatic evolution features are from cold-dry to warm-wet and to cold-dry again, and paleobotanic alternation is from desert grassland to spare-tree grassland and to frutex-desert grassland in 1.6 Ma. The composition reveals drying local lakes, salting shallow groundwaters and increasing arid climate. These are vital clues to variations in water resources and ecological environments in the inlands of Northwest China.
【Key Words】: Northwest inland Yanchi Spore-pollen composition Paleoclimate Paleobotany
【Fund】: 国家重点基础研究(973)发展计划项目(2006CB403401);; 国家自然基金项目(40472126)资助
【CateGory Index】: Q914;P532
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