【摘要】 现代孢粉数据及其关联的古环境信息是第四纪孢粉定量气候重建的基础,本研究对中国及其邻近区域现代孢粉进行了补充采样与分析鉴定和数据收集,初步建立了较大尺度的东亚地区孢粉数据库。该数据库现拥有2858个现代样点和孢粉谱数据,覆盖的国家和地区包括中国、蒙古、日本、越南、柬埔寨、泰国、印度、俄罗斯远东部分地区以及东海和南中国海海域。数据库的孢粉种类数为729个,本文对48个代表性的孢粉类型进行了等值线作图,其结果清晰显示出绝大部分孢粉的地理分布范围明确,与相关植被和气候具有紧密的关系。本研究对该数据集进行了最佳类比法重建气候可行性的验证,结果表明无论年降雨和年平均温度,重建结果都具有较高的可信度,与观测值的相关系数均达到0.9以上。该研究首次展示覆盖东亚区域的大陆尺度孢粉空间分布特征,并检验了数据资料用于气候重建的可行性,本研究提供的现代孢粉数据将有利于提高第四纪孢粉定量气候解释的研究水平。更多还原

【Abstract】 The modem pollen and spore data and their related climate ranges are crucial for palaeoclimate reconstruction based on Quaternary pollen spectra.The present work concerns data collection and supplements of modern surface pollen samples in East Asia.So far,the modern pollen dataset is composed of 2858 sites mainly from China,Mongolia,Japan,Vietnam,Cambodia,Thailand,India,Russian Far East,and the East and the South China Seas.The location of the dataset covers an area from latitude 8°N to 55°N and from longitude 70°E to 140°E.There are 729pollen types including 651 pollen taxa of Angiosperms and Gymnosperms,and 78 spores of Pteridophyte,Bryophyte and Algae.The most frequent pollen taxa in the dataset are those of generally over-representative plants,such as Artemisia,Pinus,Chenopodiaceae-Amaranthaceae,Poaceae,Castanopsis-Lithocarpus,Betula,Cyperaceae,Picea,Quercus,Alnus,Cyclobalanopsis,etc.The principal 48 pollen taxa in the database were plotted on isoline maps.Modern spatial distributions for the majority of taxa indicate distinct distribution patterns closely related to their vegetation zones and related bioclimatic areas.However,a few taxa has broader distribution such as Poaceae and Asteraceae which have low identification levels(family level).An exercise using modem analogue technique allowed testing the accuracy of the pollen-based climate reconstruction.Result shows that the reconstruction is reliable with the correlation coefficients between the observed and predicted climate values as high as >0.9.This work presents the first result of spatial distribution for principal pollen taxa at continental scale in Eastern Asia,and testifies the ability for pollen-based climate calibration.The present dataset,as an open intemet resource,may help to improve researches on quantitative paleoclimate reconstruction.更多还原