化石群落演替与环境变化

本文对湖南孟公坳组Ｃｙａｏｐｈｒｅａｔｉｓ－Ｃｈｏｎｅｔｉｐｕｓｔｕｌａ群落和刘家塘组ＦｉｎｏｓｐｉｒｉｆｅｒＭａｒｇｉｎａｔｉａ群落进行了生态演替过程分析．研究表明，化石群落的生态演替体现了当时生活在相同或相似环境中若干生物群落的动态发展．化石群落演替过程的形成和保存与生活环境和沉积环境有直接的关系．分析化石群落的演替过程可以恢复当时沉积环境的变化幅度和变化趋势，有助于研究群落与环境在时空上的变化，有利于提高地层划分和对比的精度．

FOSSIL COMMUNITY SUCCESSION AND ENVIRONMENTAL CHANGES

This paper studies the processes of ecologic succession of Cystophrentis-Chonetipustula community from the Menggongao Formation and of the Finospiriferr-Marginatia community from the Liujiatang Formation,central Hunan region.The process of ecologic succession of fossil community can be preserved in strata and fossils,and therefore can be recognized and studied by palaeontologists.According to the present study,the ecologic succession of fossil community includessuccessions of several living communities which lived under the same or similar environmental conditions.The fossil community succession consists of several stages,which reflectthe short-term environmental change.The form and preservation of fossil community succession are controlled directly by the living environment and depositional environment.It isnot only taxa component but also depositional composition that can be controlled by theexternal environmental changes.