四川卧龙地区珙桐群落的结构与更新研究

 在野外调查基础上，分析了四川卧龙地区珙桐群落的物种构成与生物多样性、群落外貌、结构和珙桐的更新动态。结果表明：1)珙桐群落植物区系丰富、古老、特有性强：2)落叶大、中高位芽和常绿中、小高位芽植物共同构成群落外貌；群落垂直结构复杂，草本层发育；3)在群落演替的前、中期，珙桐种群结构由扩展型变为稳定型；4)珙桐的有性繁殖更新机率随其在群落中重要值的上升而下降。

STRUCTURE AND REGENERATION OF DAVIDIA INVOLUCRATA COMMUNITIES AT WOLONG REGION,SICHUAN PROVINCE

Based on field survey,the species composition,flora characteristics,biodiversity of the Davidia involucrata community were investigated along with its appearance,structure,dynamics,and regeneration of D. involucrata population.The results suggest that:1) The flora of D. involucrata community was rich,ancient,and prominently endemic;2) The community appearance was dominated by the deciduous macro and mega high species and evergreen mega and micro high species.The vertical structure of the community is complex;3) The population structure of D. involucrata changed from developing to stable type from the front to middle stage of the community succession;4) The probability of the sexual regeneration of D. involucrata comes down along with the increasing of its importance values in the community.