论文部分内容阅读
In this paper, 197 samples were gathered from a 820 cm profile in Donganchi of Fangshan, Beijing. They provided a continuous record of vegetation and environmental change overca.15,000 aB. P.. By these records, it is concluded that in about 14, 100~14, 000 aB. P, the climate was cold and dry, which corresponds to Gothenburg Drift and interval between 10, 620 to10, 310 aB. P.. The rapid decline in pollen, charcoal concentrations and LOI implied a more cold-er climate and probably corresponded to Younger Dryas cooling event, at 5, 770 aB. P., 4, 650aB. P. and 2, 850 ~ 2, 650 aB. P., while the decline of forest cover showed three abrupt coldepisodes.
They provide a continuous record of vegetation and environmental change overca.15,000 aB. P .. By these records, it is said that about in 14, 100 to 14, 000 aB. P, the climate was cold and dry, which corresponds to Gothenburg Drift and interval between 10, 620 to 10, 310 aB. P .. The rapid decline in pollen, charcoal concentrations and LOI implied a more cold- er and climate may be transferred to Younger Dryas cooling event, at 5, 770 aB. P., 4, 650aB.P. and 2, 850-2, 650 aB. P., while the decline of forest cover showed three abrupt coldepisodes.