【摘要】 据大兴安岭根河镇剖面的孢粉分析、１４Ｃ测年并结合沉积地层岩性等资料，揭示该地区晚更新世晚期以来２．５万年期间，生态环境经历了七次变迁。在晚更新世晚期距今２．５～１．３万年期间有三次亚期演变；在早全新世的１．３～０．９万年间经过早、晚二次变迁；中全新世的０．９～０．４年间经过早、晚二次变迁；晚全新世的０．４万年至今。气候的寒温干湿周期０．４万年左右，０．２万年左右发生次一级变化，生态环境随之变迁。更多还原

【Abstract】 According to the materials of sporepollen analysis,14C dating analysis and sedimenlary layer′s lithology of the Daxinganling Genhe town′s geological section,The paper revealed ecotope have undergone seven changes since the later period of the later pleistocene (25 000 B.P.to now).There were three changes during the later pleistocene (25 000 to 13 000 B.P.) and two changes respectively in early and later period during the early Holocene ( 13 000 to 9 000 B.P.).In addition two changes occured in early and later period during the later Holocene (9 000 to 4 000 B.P.).The regular of climatic changes in a bigger scale approximately 4 000 years and a smaller scale approximately 2 000 years.The ecotope change according to that.更多还原