摘要
根据 3个高位泥炭剖面孢粉分析 ,揭示大小兴安岭分别于 50 0 0 a B.P.和 2 70 0 a B.P.以来孢粉组合特征和植物群与气候演变过程。小兴安岭北部山地森林植被演替划分为 2个时期 ,50 0 0 - 30 0 0 a B.P.桦为主落叶阔叶林 ;30 0 0 a B.P.-现今为红松、云冷杉为主 ,混有少量桦的寒温性针阔叶混交林。气候由温凉偏干向冷偏湿方向发展。大兴安岭北部山地 ,2 70 0 - 1 80 0 aB.P.以来 ,已构成针叶林为主 (樟子松和偃松 ) ,混少量阔叶树 (桦、榛 )的针阔叶混交林。 1 80 0 aB.P.-现今是落叶松、云冷杉和樟子松为主的北方寒温性针叶林。该区域一直被冷湿气候控制 ,其中在 1 80 0 - 1 30 0 a B.P.是气温最低 ,冻土向南扩张时期。依据孢粉化石记录和泥炭剖面植物残体垂直变化 ,大小兴安岭高位泥炭发育经历由低位到中位和高位泥炭过程 ,约 1 30 0 a B.P.以来大小兴安岭泥炭藓丘大面积形成并继续发育。
The study documented features of spore pollen assemblages and revealed changes in the vegetation and climate in Da Hinggan Ling and Xiao Hinggan Ling mountains since 5 000aB.P. and 2 700 a B.P., respectively, based on data in 3 profiles of high moor peat deposits. Two periods can be recognized, in which the period of 5 000-3 000 a B.P. was characterized by the temperate broad leaved forest with predominant Betula, and the period of 3 000 a B.P.-present characterized by conifer and broad leaved forest with predominant Pinus koraiensis, Picea and Abies , in the northern part of Xiao Hinggan Ling mountains. The climate changed from slight dry temperate to wet cool and temperate.There had been the mixed conifer and broad leaved forest with predominant Pinus sylvesteris, Pinus pumila and a few Betula and Corylus in 2 700-1 800 a B.P. After 1 800aB.P. there were cool temperate conifer forests consisting of Larix, Picea ,Abies and Pinus sylvestris in the northern part of Da Hinggan Ling mountains. The period was dominated by cool and wet climate, in which the period of 1 800-1 300 a B.P. had lowest temperate plants and permafrost condition extended southward. Pollen data through confirmation of vertical change of plant residue from the peat profile showed that the evolution of the high moor peat in Da Hinggan Ling and Xiao Hinggan Ling mountains passed 3 phases from the low moor peat to middle moor peat, and to high moor peat, and the Sphagnum dune of peat has developed extensively and continuously since 1 300 a in Da Hinggan Ling and Xiao Hinggan Ling mountains.
出处
《微体古生物学报》
CSCD
北大核心
2000年第2期218-227,共10页
Acta Micropalaeontologica Sinica
