福州平原第四纪晚期孢粉组合

LATE QUATERNARY PALYNOLOGICAL ASSEMBLAGE IN FUZHOU PLAIN

本文通过对福州平原7个钻孔99块孢粉样的分析,初步探讨了晚更新世以来该区古气候的变化趋势和古植被的演替规律,为确定有关地层的地质时代和划分提供依据。一、地理位置及地层概况福州平原系福建省四大平原之一,位于闽江河口段(25°50′—26°12′,119°08′—119°26′E),面积约400km^2。本区处于我国东南季风区,气候温和湿润。境内植被系以樟科(Lauraceae)和壳斗科(Fagaceae)为主的亚热带常绿照叶林,但大多已被开垦(图1)。

The present paper deals chiefly with the spores and pollen grains obtained from the upper Quaternary of Fuzhou Plain.According to vertical and horizontal distribution of fossil spores and pollen of 99 samples of spores and pollen from 7 drill cores,the Quaternary of Fuzhou Plain may be divided in ascending order into five assemblages;Ⅰ.Pteridophytic-Cupressaceae;Ⅱ.Pinus-Quercus-Gramineae;Ⅲ.Quercus-Pterocarya-Juglans;Ⅳ.Castanopsis Quercus;V.Quercus-Pinus-Gramineae.The five assemblages reflect on the whole the changing trend of the palaeoclimate and the succession law of the palaeovegetetion,in accordance with that is the eastern area of Chinese Continent.The writer suggest to divide the upper Quaternary of Fuzhou Plain into four stratigraphic units;Longhai formation(Q3?),Lower Holocene series(Q41),Middle Holocene series(Q42)and Upper Holocene series(Q43).