杭嘉湖平原全新世沉积的孢粉组合及其意义

本文通过对杭嘉湖平原六个钻孔的全新世沉积的孢粉分析,揭示了本区全新世沉积的六个孢粉组合,它们自下而上分别为:(1)松属、栎属、禾本科孢粉组合;(2)栎属、松属、禾本科孢粉组合;(3)青刚栎属、栲属、栎属、藜科孢粉组合;(4)松属、栎属、禾本科、藜科孢粉组合;(5)栎属、青刚栎属、栲属,禾本科孢粉组合(6)栎属、禾本科、水龙骨科孢粉组合.这六个孢粉组合反映了本地区全新世时期存在着六个古植被演变阶段和相应的六次气候波动,为本地区全新世地层划分提供了重要依据.

The Spore-pollen Assemblage of the Holocene Sediments and its Significance in the Hangzhou-Jiaxing-Huzhou Plain

According to the result of polynological analysis of the Holocene sediments of six wells in the Hangzhou-Jiaxing-Huzhou plain, this paper divides the sediments into six spore-pollen assemblage zones of different characters.Prom the bottom to the top in the Holocene sediments of this region these spore-pollen assemblage zones may be showed as following: (1) Pinus-Quercus-Gramineae assemblage.(2) Quercus-Pinus-Gramineae-Chenopodiaceae assemblage.(3) Q.glanca-Castanopsis-Quercus-Chenopodiaceae assemblage.(4) Pinus-Quercus-Gramineae-Chenopodiaceae assemblage.(5) Quercus-Q.glanca-Castanopsis-Gramineae assemblage.(6) Quercus-Gramineae-Polypodiaceae assemblage.A conclusion can be drawn from the analysis of these spore-pollens that there had been six successive stages of plaeove-getation and plaeo-climate since the late Pleistocene in the Hangzhou-Jiaxing-Huzhou plain.It provides edvidence for the division of strata age in this region.