地理科学 ›› 1997, Vol. 17 ›› Issue (4): 316-322.doi: 10.13249/j.cnki.sgs.1997.04.316

• 论文 • 上一篇    下一篇

主成分分析对恢复过去植被和环境作用的再分析——以北京坟庄剖面为例

张佳华1, 孔昭宸2, 杜乃秋2   

  1. 1. 中国科学院遥感应用研究所, 北京100101;
    2. 中国科学院植物研究所, 北京100093
  • 收稿日期:1996-03-05 修回日期:1996-09-03 出版日期:1997-07-20 发布日期:1997-07-20
  • 基金资助:
    国家自然科学基金;中国科学院古生物与古人类基础研究特别支持课题

REANALYSIS OF PRINCIPAL COMPONENT ANALYSIS TO RESUME PAST FLORA AND ENVIRONMENT ——TAKING FENZHUANG PROFILE IN BEIJING AS AN EXAMPLE

Zhang Jiahua1, Kong Zaochen2, Du Naiqiu2   

  1. 1. Institute of Remote Sensing Application, Academia Sincia, Beijing 100101;
    2. Institute of Botany, Academia Sincia, Beijing 100093
  • Received:1996-03-05 Revised:1996-09-03 Online:1997-07-20 Published:1997-07-20

摘要: 从北京坟庄剖面具有14C测年的54个样品原始记录中,选取11个孢粉类型,用主成分分析的方法对该区晚更新世以来的孢粉资料进行再分析,阐明该方法能消除因主观原因对同一孢粉谱的分带差异。对北京多样性的生态环境,用累积贡献率为57%且离散性大响应此环境特征,更好地恢复过去环境.

Abstract: Based on the pollen data of Fenzhuang profile from the Late Pleistocene to the Early Holocene, the paper gives a further analysis to subdivide zones of pollen assemblages and changes of paleovegetation and paleoenvironment in this area using principal component analysis (PCA). In the paper 11 pollen types were selected from original records of 54 samples in the profile, then 54?11 matrix was set up. The first factor of PCA indicates the development process intensity of herbs and cold trees, on the contrary, the development process intensities of in Tila and Pinus and ferns (Selaginella sinensis, Polypodium) were restrained. The second factor of PCA indicates the development process intensity of mesophytic herbs and Artemisia+Compositae. In the meantime the development of aquatic plants and hydrophe may be restrained. The third factor of PCA indicates the co development of aquatic plants and mesophytic herbs in Beijing region. From the scatter diagrams of 1,2 and 1,3 factors, 54 pollen samples were divided into 4 types (correspond to 4 zones). In type A (zone 1, over 13000 a B.P.), the vegetation was steppe dominated by Artemisia and Chenopodium, the climate was dry and cold. In type B (zone 2, ca. 13000 a B.P.-11400 a B.P.), the vegetation was dominated by a subalpine conifer forest, aquatic plants increased, the climate was cold and wet. In type C (zone 3, ca 11400-11000 a B.P.), the vegetation was represented by temperate broadleaf tree such as Tilia, the aquatic plant was predominant too, lakes and swamps deceased, the climate was warm and became dry. In types D (zone 4), since 11000 a B.P. trees and aquatic plants developed better at its initial stage, but afterwards they obviously reduced after 10000 a B.P., with subdividing zone of Fenzhuang profile, there were differences in the third zone between Kong and Liu, the reason is that the C type is transitional. Finally the biodiversity in plant communities and complex geographical environment in Beijing area, using great dispersal of accumulative percent of total in PCA, may sufficiently echo this character, for cumulative only 57% from the first three factors.