青藏高原中部兹格塘错流域表土花粉的初步研究  

POLLEN ANALYSIS OF SURFACE SOIL SAMPLES FROM THE ZIGETANG CO AREA,CENTRAL TIBETAN PLATEAU

作　　者：庞有智[1] 李春海[2] 于革[2] 沈华东[2] 

机构地区：[1]内江师范学院地理与资源科学学院,内江641100 [2]湖泊与环境国家重点实验室中国科学院南京地理与湖泊研究所,南京210008

出　　处：《微体古生物学报》2012年第2期145-151,共7页Acta Micropalaeontologica Sinica

基　　金：中国科学院重要方向项目(KZCX22YW2338);国家自然科学基金项目(40730103,40872116)资助

摘　　要：通过对青藏高原中部兹格塘错流域12个样品的花粉资料进行分析,结果显示,花粉组合特征能够很好地反映流域植被的总体特征。研究区花粉组合主要以草本植物花粉为主,其中莎草科花粉含量占绝对优势,平均为58.1%,其次为禾本科花粉,平均为14.7%,还有少量的菊科、蒿属、蔷薇科、藜科、石竹科和毛茛科等植物花粉。同时,笔者利用禾本科+蒿属与莎草科含量[(G+A)/Cy]比值作为区分青藏高原中部兹格塘错流域高寒草原区与草甸区不同植被类型的依据,并认为其比值大于0.1为高寒草原区,反之为高寒草甸区。该研究为青藏高原中部及其它地区利用花粉重建古植被提供了重要的参考依据。A total of 12 surface soil pollen samples taken from the Zigetang Co area, central Tibetan plateau have been analyzed. The results show that the pollen assemblages of surface soil samples generally reflect the modern vegetation. The pollen flora is mainly composed of herb pollen, which dominated by Cyperaceae （58. 1%） and Gramineae （14. 7%）, with a very low content of other pollen such as Compositae, Artemisia, Rosaceae, Chenopodiaceae, Caryophyllaceae and Ranunculaceae. The ratio of （Gramineae＋ Arternisia）/Cyperaceae [（G＋A）/Cy-] proposed here by the authors is useful to sig- nificantly identify the vegetation condition between Alpine steppe and Alpine meadow. The result shows that the mod- ern vegetation has higher ratio （〉0.1） of Alpine steppe and the lower ratio （〉0.1） of Alpine meadow. This study provides theoretical bases for quantitative reconstructions of palaeoclimate and palaeovegetation conditions based on fossil pollen spectra from lake sediments in the central Tibetan plateau and the surrounding areas.

关 键 词：表土花粉 高寒草原 高寒草甸 兹格塘错 青藏高原 

分 类 号：Q948[生物学—植物学]