Abstract:

Emmenopterys henryi, an endemic species in China, is one of the grade Ⅱ rare and endangered plants for the National Key Conservation. The method of tally was used to analyze the field data in 9 different habitats. The structure and patterns of E. henryi were examined by applying the spatial difference substituting for temporal change. The distribution patterns of E. henryi were discussed on the basis of assembling intensity indexes,such as Variance/ mean,negative binomial distribution,mean crowding and index of patchiness. The results showed that there was comparability in the size-class structure of E. henryi in different habitats. All the populations showed a declining trend because of the lack of seedlings. The pattern scale of all the populations was 8～32 m². The distributions of the populations were mostly clumped. The patterns of saplings were clumped. However,they were the random distribution on the stages of middle and large trees. At last,protection measures were proposed. Firstly,the corresponding measure should be taken to protect the mother tree. Otherwise,the study on the dynamic of seed to seedling should be strengthened.

Key words: Emmenopterys henryi, size-class structure, distribution pattern, different habitats