地史转折期的生态系

生态系的演变是地球各圈层系统耦合关系变化的直接标志。地史转折期的生态系具有复杂的生物内涵，在绝灭—残存—复苏过程中，各生物类别的演替遵循着一定的生存型式。大绝灭后生态系复苏的原动力是绝灭后迁入避难所的复活类型和大绝灭末期高压环境中产生的祖先类型的新生和辐射发展。全面了解绝灭后生态系的组成和结构，对于正确认识地史转折期，即圈层耦合结点处的地质作用型式和过程具有重要作用。

ECOSYSTEM AT THE TURNING POINT OF GEOLOGICAL HISTORY

The development of ecosystem is the direct marker of the change of the coupling relationship among the various earth systems (earth's spheres). The ecosystems around the abrupt turn in the geological history were of complicated biological connotation. The evolution of biotic taxa during the mass extinction-survival-recovery process has followed certain mode of existence. The rebounding motivity of the ecosystem after mass extinction was the renewal and radiation of the Lazarus taxa immigrated into some refugia before extinction and the progenitors occurring in high-pressure physical conditions during the last episode of mass extinction. Comprehensive study of the composition and structure of the ecosystem after mass extinction is significant to properly understand the geological pattern and process at the turning point of geological history, or the conjuncture of the coupling of earth's spheres.