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Impact of climate change on dynamic of plant communities. lakes and swamps in Beijing area during holocene.period

Journal of Geographical Sciences 1999年第2期9卷 116-122页

作者： Zhang jia-hua Kong Zhao-chen Fu Cong-bin (START, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,China. Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China)

From 400-60 cm 26 samples were obtained in an 820 cm profile at dongganchi of Fangshan in Beijing. They provided a continuous record of vegetation and environmental changes over ca .7000 aB.P., as inferred from Spore-pollen. loss-on-ignition (LOI), and charcoal analysis,impacts of natural fire and human activities on plant communities.and lakes and swamps were considered. 1) From 7000-5960 aB.P, the forest development was limited, probably in response to climate Warming. Aquatic and marsh plants began to increase, bat the lakes and swamps in some areas were limited. 2) About 5960-3390 aB.p, presumably in responded to climate warming which was warmer than that at present Aquatic plants began to become abundant,reflected the widespread development of the lakes and swamps, the climate was wet with annual precipitation higher than that at present 3) About 3390-1000 aB.P, human activities have kept to be the dominating factor in the evolution of vegetation and climatic change. Temperature decreased, and the annual precipitation rapidly reduced in Baijing area. the lakes and swamps gradually shrank back, some of them even disappeared. 4) After 1000 aB.P, there was a severe fluntuction, and early during this time, it was comparatively warm and humid, but became cool and dry later. In the meantime. human activities were intensified. agricultural activity was flourished. and large area of water field was cultivated

关键词： plant communities. lakes and swamps, pollen analysis, holocene. dongganchi profile Beijing

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