河北坝上地区植硅体空间分布特征及其环境意义  

Spatial distribution characteristics of phytolith in the topsoil of Bashang area,Hebei Province and their environmental significance

作　　者：刘林敬[1,2] 毛欣 姜高磊[1,2] 赵红梅 李长安[3] 毕志伟 郭娇[1] 朱玉晨 LIU Linjing;MAO Xin;JIANG Gaolei;ZHAO Hongmei;LI Changan;BI Zhiwei;GUO Jiao;ZHU Yuchen(Institue of Hydrogeology and Environmental Geology,CAGS,Shijiazhuang,Hebei 050061,China;Key Laboratory of Quaternary Chronology and Hydrological Environment Evolution CAGS,Shijiazhuang,Hebei 050061,China;School of Greogra phy and Information Engineering,China University of Geosciences,Wuhan,Hubei 430074,China)

机构地区：[1]中国地质科学院水文地质环境地质研究所,河北石家庄050061 [2]中国地质调查局第四纪年代学与水文环境演变重点实验室,河北石家庄050061 [3]中国地质大学(武汉)地理与信息工程学院,湖北武汉430074

出　　处：《地质学报》2022年第6期2184-2194,共11页Acta Geologica Sinica

基　　金：国家自然科学基金项目(编号42177428,41907375,41807420,41602194);中国地质科学院基本科研业务费专项经费(编号SK202007,SK202105)联合资助的成果。

摘　　要：了解不同区域表土植硅体组合特征及其对气候环境的响应过程,是利用植硅体指标恢复古植被和古气候的基础。本文通过对河北坝上地区103块表土植硅体的分析鉴定,共统计出棒型、尖型、帽型、鞍型、哑铃型、齿型、块状、扁平状、扇型、三棱柱型、锥骨状、导管型、弓型和特殊型14种植硅体类型,其中植硅体类型主要以棒型和尖型为主,而短细胞植硅体的含量较少。通过研究区相对暖湿区、暖干区、冷湿区和冷干区的表土植硅体组合特征对比发现,在相对较冷的区域棒型量含量较高,在相对较暖的区域扇型、扁平状和鞍型含量较高,在相对较湿的区域尖型含量较高,在相对暖湿的区域块状含量较高,在相对冷湿的区域齿型含量较高,这表明研究区表土植硅体组合特征对气候环境响应较为敏感。本研究成果可为重建坝上地区古植被和古气候提供基础资料。Understanding the topsoil phytoliths assemblages in different regions and their response to climate change,is the basis for using phytolith indices to recover paleovegetation and paleoclimate.The phytolith assemblages were analysed based on 103 topsoil samples from the Bashang area,Hebei Province,and classified into 14 types,including elongate,lanceolate,rondelle,saddle,bilobate,serrated,clumpy,flat,bulliform,prism,vertebrate,conduit,bow type,and special types.The phytolith assemblages mainly consist of elongate and lanceolate types,while short-celled phytolith types were scarce.A comparison of the topsoil phytolith assemblages in the relatively warm-humid,warm-dry,cold-humid and cold-dry zones of the study area,which revealed that the higher content of elongate types in cold zone,while the contents of bulliform type,flat type and saddle types were higher in warm zone.The lanceolate type,clumpy type and serrated type were dominant in the wet zone,warm-wet zone and cold-wet zone,respectively.This indicated that the topsoil phytolith assemblages in Bashang area were sensitive to the annual temperature and precipitation.This case study could be used as a baseline for interpreting fossil phytolith assemblages for palaeovegetation and palaeoclimate reconstruction in the Bashang area.

关 键 词：坝上地区 表土沉积物 植硅体 空间分布 环境意义 

分 类 号：P532[天文地球—古生物学与地层学]