Spatial distribution pattern and intraspecific and interspecific relationships of genus symplocosin Mulinzi Nature Reserve, Hubei Province

The mechanism of species coexistence is an important issue of ecological research. The spatial distribution pattern and intraspecific and interspecific relationships of Symplocos sumuntia and Symplocos lancifolia were analyzed in this paper. All Symplocos sumuntia and Symplocos lancifolia trees were divided into four diameter classes which represented four growth stages: sapling, small tree, medium tree and adult tree. The spatial distribution pattern of Symplocos sumuntia and Symplocos lancifolia were analyzed by single-variable pair-correlation function, and bi-variate pair-correlation function was used to analyze the intraspecific and interspecific interactions. The results showed that the diameter structure of Symplocos sumuntia and Symplocos lancifolia was basically the same, and two populations were growing populations. Symplocos sumuntia and Symplocos lancifolia populations were aggregated distribution characterized by the complete spatial randomness model, and gradually become to a uniform distributio