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本文通过对90个类型孢粉母体植物生态特征的研究,认为由于本区第三纪所含蕨类植物大多为热带和亚热带类型,裸子植物大部分也如此,现存温带的仅有云杉和刺柏,耐寒植物只有冷杉和落叶松。50个类型被子植物中有15个属目前仅存于长江以南,10个属分布于北温带,其余为广分布类型。从而得出结论:早第三纪依兰——伊通地区地处亚热带,植被以阔叶——针叶混交林为主;晚第三纪气候变凉,地处暖温带。本文还逐个讨论了第三系各组沉积时的古植物群面貌及古气候特点。
In this paper, the ecological characteristics of 90 types of sporopolophyte plants are studied. It is considered that most of the gymnosperms belong to the tropic and subtropical types because of the Tertiary in this area. Only the spruce and thorn Cypress, hardy plants only fir and larch. Fifty of the 50 types of angiosperms are present only to the south of the Yangtze River, 10 are located in the northern temperate zone and the rest are widely distributed. It is concluded that the early Tertiary Yilan-Yitong area is located in the subtropical zone with vegetation dominated by broad-leaved-coniferous mixed forests. Late-Tertiary climate became cooler and located in warm temperate zone. This article also discusses the paleo-flora features and paleoclimatic features of the Paleogene sediments.