疑源类是早古生代海生微体浮游植物群落的主要组成者,绝大多数疑源类被发现于海相地层中,在元古代和古生代海洋生态系统中处于初级生产者的位置.以疑源类为主体的海生微体浮游植物群落的分布对其他生物类群的分布有重要影响.应用聚类分析和主成分分析,共识别出华南地区下、中奥陶统贵州桐梓红花园湄潭组、重庆城口厚坪大槽组和营盘组、湖北宜昌黄花场和大坪大湾组等4条剖面的10个疑源类生态组合,认为这些疑源类组合的时空分布主要受环境因素变化的控制. Most of the suspected sources are found in the marine strata and are in the position of primary producers in Proterozoic and Paleozoic marine ecosystems. The distribution of marine phytoplankton community plays an important role in the distribution of other biotic groups.Using cluster analysis and principal component analysis, we identified the Meitan Formation of Tongzhonghong Garden in Guizhou Province in South China , Chongqing Pinggu Ongpa Formation and Yingpan Formation, Hubei Yichang Huanghuachang and Daping Dawan Formation, etc., the temporal and spatial distributions of these suspected source combinations are mainly affected by environmental factors control.