Abstract: Phylogenetic structure has been used to explore the mechanisms of community composition, but little attention has been paid to the phylogenetic structure of plant communities undergoing strong human disturbance. Based on data from 205 species in four kinds of community in 39 quadrats on mountains of eastern Yunnan, we analyzed the community phylogenetic structure to discover the community assembly mechanism during forest restoration. The results indicated that: (1) Pinus armandii forest, Alnus ferdinandicoburgii forest and secondary evergreen broadleaved forest developed under different restoration ways were all phylogenetically clustered, suggesting the dominance of habitat filtering. (2) Herbaceous plants growing in Pyracantha fortuneana shrubs at early stage of recovery were phylogenetically random at large scale, which might be the result of habitat filtering and competitive exclusion. (3) The legacy effects of previous stages or interference (such as farming, logging) might remain, which made the new community phylogenetic structure more clustered under the effects of habitat filtering. (4) Plant community phylogenetic structures of differing lifeforms were different, indicating that the dominant factors affecting plant community assembly varied according to lifeform.

Key words: straw management, cropping system, soil quality, soil enzyme activity, soil organic carbon