关键词: 青田田鱼, 传统农业系统, 从江田鱼, 形态分析, 遗传分析

Abstract: Based on data from several investigations, we explored flora composition, structure, regeneration status and succession of Davidia involucrata community in Daxiangling Nature Reserve, Sichuan. The results showed that: (1) The vegetation was a transition flora type from subtropical to temperate zone. The coexistence of many ancient genera reflected the ancient and solitary of flora. (2) The diameter-class structure of the community was biased with a normal distribution, and the height-class structure showed an inverted J-shaped curve. The development trend of community structure was relatively stable. (3) The age structure of D. involucratapopulation was approximately pyramidal, as a growing type. Overall, the pure D. involucrata forest (community type C) was the best in matching dominance and at the late stable succession stage, which was the climax community in Daxiangling Nature Reserve. Our results suggested that establishing a special protection area for in situ conservation of D. involucrata is an effective method for the conservation of native communities.

Key words: Qingtian field carp, traditional agricultural system, Congjiang field carp, genetic analysis, morphologic analysis.