Regional features of pollen R-values in China  

作　　者：Jie XIA Jian NI 

机构地区：[1]College of Life Sciences,Zhejiang Normal University,Jinhua 321004,China [2]Jinhua Mountain Observation and Research Station for Subtropical Forest Ecosystems,Jinhua 321004,China

出　　处：《Science China Earth Sciences》2024年第1期295-308,共14页中国科学（地球科学英文版）

基　　金：This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant Nos.XDB31030104,XDA19050103 and XDA2009000003).

摘　　要：Establishing a quantitative relationship between modern pollen and vegetation remains a pivotal but intricate pursuit within the field of Quaternary palynology.The R-value,a well-established and traditional metric characterized by its simplicity and direct applicability,serves to calibrate the nonlinear disparities between surface pollen and modern vegetation.This study entails the construction of a comprehensive pollen R-value dataset for China derived from R-values published between 1987 and 2021.The dataset,compiled after rigorous screening,calibration,and standardization processes,encompasses 898 modern pollen sampling sites and 2115 pollen R-value data entries,encapsulating 152 pollen taxa spanning 65 families and 113 genera.Synthesizing the extracted R-values yielded the following insights:(1)A macrospatial analysis validates previously established knowledge at a site-specific scale.Evidently,pollen R-value variations across China are statistically significant.Approximately two-thirds of pollen taxa exhibit underrepresentation(e.g.,Taxodiaceae,Corylus,Nitraria,Tamarix,Cyperaceae,Poaceae,and Fabaceae),while the remaining one-third display overrepresentation(e.g.,Pinus,Picea,Betula,Ephedra,Chenopodiaceae,and Artemisia).The degree of underrepresentation surpasses that of overrepresentation,and the representation patterns of Castanea,Quercus,Polygonaceae,and Asteraceae are contingent upon vegetation types.(2)Pollen R-values follow distinct spatial distribution patterns within China.In the woody vegetation region of eastern China,R-values progressively decline from north to south,correlating with rising temperatures and precipitation.Conversely,in herbaceous vegetation regions of northern and western China,R-values decrease from east to west and from northeast to southwest,corresponding to increased aridity.Nevertheless,pollen R-values manifest variation contingent on pollen taxa,vegetation types,and climatic regions,even differing for the same taxa across varying vegetation types and climatic conditions.This hi

关 键 词：Pollen R-value Modern pollen-vegetation relationship Regional pattern VARIABILITY Paleovegetation reconstruction 

分 类 号：Q914[天文地球—古生物学与地层学] P532[生物学—古生物学]