云南丽江-大理地区现代表土花粉垂直分布特征

文章主要研究云南丽江-大理地区不同海拔高度表土花粉。虽然松属花粉在各个植被带都占有优势，但是建群种花粉含量相对较高。降趋对应分析法（detrended correspondenc eanalysis，简称DCA）分析显示，表土花粉的分布和海拔之间具有非常密切的关系，DCA第一轴的值和海拔高度之间的线性相关系数达0．82（r^2=0．82）。此次研究表明，在云南山地，可以通过含量相对较高的花粉来重建古植被。

A STUDY OF SURFACE POLLEN ON AN ELEVATIONAL GRADIENT IN LIJIANG AND DALI AREAS,YUNNAN PROVINCE,CHINA

Surface pollen analysis has been an important tool for refining vegetation history and palaeoclimatic interpretations.In order to study the relationships between vegetation and pollen spectra,modern samples are collected from moss and soil along an elevational gradient in the Lijiang and Dali areas,Yunnan Province.The dominant pollen taxa show relatively high pollen spectra of different vegetation types,although the pollen spectra are distorted by Pinus,which is predominant in almost all pollen spectra of vegetation.Detrended correspondence analysis(DCA)shows a close correlation between community composition and elevation,and the DCA axis 1 scores are strongly correlated with sample elevation,exhibiting a linear relationship(r2=0.82).This study suggests that the paleo-vegetation could be characterized and reconstructed by pollen types which have relative high value in pollen assemblages from mountainous areas in Yunnan Province.