织金洞扫尾豪猪粪堆积层的孢粉组合及其地质意义

THE SPOROPOLLEN GROUPS OF THE ATHERURUS MACROURUS DUNGHILL IN ZHIJIN CAVE AND THEIR GEOLOGIC SIGNIFICANCE

通过对贵州织金洞扫尾豪猪粪堆积层孢粉组合分析研究及￣（１４）Ｃ年龄测定，明显地反映出织金洞地区近６７１０±１３０ａ来的古植被和古气候均属北亚热带的植被面貌及气候特征。划分出的四个孢粉带所反映的植被演替过程为：松占优势，混有桦、栎常绿阔叶的针叶林→松占优势，含五加，栋和山核桃的针叶阔叶混交林→松占优势，栋、五加和桦增多的针叶阔叶混交林→松为主，混有胡桃、五加和榆落叶阔叶的针叶林；相应的气候变化是：温和偏湿→温暖偏干→温暖湿润→温凉干燥。

Bysporopollen analysis and￣(14)C dating of the Atherurus macrourus dunghill in the Zhijin caveof Guizhou,it is reflected that the paleovegetation and paleoclimate in the cave area during last6710±130 years belong to the northern subtropical vegetation and climate.Four sporopollengroups identified show a vegetational succession evolved from coniferous forest with a dominanceof Pinus and a mixture of some evergreen broadleaf forest such as Betula,Quercus,etc.→mixedconiferous and broadleaf forest with a dominance of Pinus and others such as Araliataceae,Quer-cus and Carya→mixed coniferous and broadleaf forest with a dominance of Pinus and an increaseof Quescus,Araliataceae and Betula→coniferous forest with a majority of Pinus mixed with somedeciduous broadleaded Juglans,Araliataceae and Ulmus.The climatic changes are accordinglyfrom temperate and leaning humid→warm and leaning dry→warm and humid→ccol and dry.