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《Acta Palaeontologica Sinica》 2008-04
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POLLEN ASSEMBLAGES AND NUMERICAL ANALYSIS OF SURFACE SAMPLES FROM XINGLONG MOUNTAIN NATIONAL RESERVE,GANSU

SANG Yan-li 1) 2) ,MA Yu-zhen 1) ,GAO Shang-yu 1) ,WU Jing 2) MENG Hong-wei 2) ,SUN Ai-zhi 2) and MAN Zi-hong 3) 1) Key Laboratory of Environmental Change and Natural Disaster (Ministry of Education of China),Beijing Normal University,State Key Laboratory of Earth Surface Processes and Resource Ecology,Beijing 100875,2) College of Earth and Environment Sciences,Lanzhou University,Lanzhou 730000;3) Liancheng National Nature Reserve in Gansu Province,Lanzhou 730333  
In this paper 40 surface pollen samples from Xing-long Mountain Nature Reserve in Gansu Province were analysed for relationship between pollen and vegetation. The data were classified using Hierarchical Cluster Analysis (HCA) and were ordinated by using Detrended Correspondence Analysis (DCA). The relationship between surface pollen assemblage and plant community shows that:1)the pollen assemblages from most of the forests and part of the shrubs seem to correspond well with the distribution of the pollen producers,such as Picea wilsonii forest(Picea assemblage),Quercus liaotungensis forest(Quercus-Betula-Artemisia assemblage),Betula platyphylla forest(Betula-Artemisia-Hippophaё assemblage),and Hippophaё rhamnoides ssp. sinensis shrub(Hippophaё assemblage); 2)the pollen assemblages from Rosaceae shrub (Artemisia-Rosaceae assemblage) and steppe (Artemisia-Compositae assemblage) may represent characteristics of plant community moderately; 3) the pollen assemblages from Populus davidiana forest,Betula utilis shrub,and alpine/subalpine shrub and meadow are not well associated with their plant communities. This study also sheds light on several important issues in pollen dispersal and representation. The higher Picea percentages correspond closely to the distribution of spruce trees in the spruce forest and mixed forest,and the occurrence of Quercus pollen is consistent with the distribution of oak trees. The higher Betula pollen value (30%) probably indicates the existence of birch forest,and birch trees may not be locally present at sites where Betula pollen occurs at values 10%. Hippophaё and Artemisia are over-represented,whereas Leguminosae,Gramineae and Rosaceae are under-represented pollen taxa. In addition,HCA and DCA are effective to indicate the distinction between different pollen assemblages and environmental gradient,but limited in detailed explanation of vegetation from pollen assemblages.
【Fund】: 国家自然科学基金(No.40671184);; 北京师范大学人才专项(No.13770825)资助
【CateGory Index】: Q948
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