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Quantitative relationship between pollen and vegetation in northern China[J]. XU QingHai1, LI YueCong1,2, YANG XiaoLan3 & ZHENG ZhenHua3 1 College of Resource and Environment, Hebei Normal University, Shijiazhuang 050016, China;2 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;3 Hebei Institute of Geography Science, Shijiazhuang 050011, China.Science in China(Series D:Earth Sciences). 2007(04)