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根据花粉等时线图和代表性剖面花粉资料 ,总结了东北全新世主要乔木种类出现和发展的地区差异。三江平原和小兴安岭地区的栎属与松属的出现和发展分别比长白山地区推迟 1— 2千多年。这个时间上的差别说明它们可能有从南向北的迁移过程。不同乔木种类迁移的速率也不一样。初步估计的几种乔木迁移速率为 :栎属 2 50— 590 m/ a,松属 1 50— 580 m/ a,胡桃属2 0 0— 81 0 m/ a。这种差异可能主要与种子大小、河流和地形等因素有联系。
Based on the pollen isochron and the representative pollen profile, the regional differences of occurrence and development of main tree species in the Northeast Holocene were summarized. The emergence and development of Quercus and Pinus in the Sanjiang Plain and Xiaoxing’an Mountains, respectively, were postponed by more than 1-2,000 years than those in the Changbai Mountain area. This difference in time indicates that they may have migrated from south to north. Different types of tree migration rate is not the same. The initial estimated rates of arbor migration are: Quercus 2 50-590 m / a, Pinus 1 50-580 m / a, Juglans sibirica 2 0 0-81 0 m / a. This difference may be mainly related to factors such as seed size, river flow and topography.