四川卧龙地区珙桐群落的结构与更新研究

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

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。

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.