Pollen AnalysiS and Paleoenvironment Study of Late Pleistocene in Daganba, Guizhou Province Palaeoclimate and Palaeoenvironment of the Last Glacial Stage in Salawusu Area of Nei Monggol, China The Characteristics of the Pollen Spore Time Series Fluctuation and Its Significance in the Geological Environments of the Quaternary in Kunming Basin A Method of PollenSpore Analysis in Loess