Spatial homogenization of soil-surface pollen assemblages improves the reliability of pollen-climate calibration-set

作     者：Fang TIAN Xianyong CAO Ran ZHANG Qinghai XU Wei DING Xingqi LIU Baolin PAN Jianhui CHEN Fang TIAN;Xianyong CAO;Ran ZHANG;Qinghai XU;Wei DING;Xingqi LIU;Baolin PAN;Jianhui CHEN

作者机构：College of Resource Environment and TourismCapital Normal UniversityBeijing 100048China Alpine Paleoecology and Human Adaptation Group(ALPHA)Key Laboratory of Alpine EcologyInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China CAS Center for Excellence in Tibetan Plateau Earth SciencesChinese Academy of SciencesBeijing 100101China College of Resources and Environment SciencesHebei Normal UniversityShijiazhuang 050024China Institute of Geological SciencesPalaeontologyFree University of BerlinBerlin 12249Germany Key Laboratory of Western China's Environmental Systems(Ministry of Education)College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2020年第63卷第11期

页      面：1758-1766页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 0713[理学-生态学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41877459&41630753) CAS Pioneer Hundred Talents Program(Xianyong CAO) the National Natural Science Foundation of China(NSFC) the German Research Foundation(DFG)(Grant No.41861134030) 

主　　题：North-central China Soil-surface pollen Climate reconstruction WA-PLS 

摘      要：To make a reliable reconstruction of past climate from soil-surface modern pollen,it is necessary to reduce the sources of *** this paper,pollen percentages of the sub-continental scale modern pollen-climate dataset from China and Mongolia(with 68%soil-surface samples)are homogenized at various spatial scales.A tailored calibration-set is then applied to lake sediment-surface pollen assemblages from north-central China to evaluate their predictive *** indicate that spatial homogenization of modern pollen percentages can increase the proportion of inertia explained by climatic variables in CCA and improve the model performance of leave-one-out cross-validation using ***-surface pollen assemblages can thus be employed into a calibration-set for reliable climate estimation and they perform better when the calibration-set has been locally ***-scale(e.g.,radii 2,5,or 10 km)homogenization reduces the local noise in soil-surface pollen assemblages and improves the cross-validated performance,while broader scale homogenization(more than 20 km radius)blurs the pollen-climate *** sediment-surface pollen assemblages from close to the shore could contain pollen grains transported by rivers or from the shore vegetation and thus fail to represent regional climate well like the assemblages from the central part and deep-water area of lake.