优势种密度制约及其对森林群落物种多样性维持的影响

doi:10.5814/j.issn.1674-764x.2016.04.006

Abstract

Abstract: In order to test whether density dependence influences community diversity, a combination of manipulative experimentation and plot surveys were done using Cryptocarya concinna, a dominant species in subtropical evergreen forest. Twelve pairs of 1 m² seedling plots were built around 12 adults, and plots were treated monthly with either a fungicide or a control. The surviving proportion of C. concinna seedlings at different stages was calculated, and an analysis was conducted on the impact of fungicide on seedling survival and species richness. Correlation between relative abundance and community evenness at different ages was analyzed using plot surveys. The results showed that fungicide treatment decreased species richness of the seedling community by promoting the recruitment of common species. Furthermore, census of a 25 m radius around adult C. concinna trees confirmed that the density of saplings increased with distance from adults. Relative abundance of C. concinna decreased with increasing age, and decreasing C. concinna dominance resulted in an increase in community evenness. To avoid the appearance of a single optimum population, the dominance of C. concinna decreased with age via density dependence, and subsequently improved community species diversity.

Key words: density-dependent, dominant species, evergreen broad-leaved forest, Janzen-Connell hypothesis, species diversity

PENG Zongbo, JIANG Ying. Density Dependence of a Dominant Species and the Effects on Community Diversity Maintainance[J].Journal of Resources and Ecology, 2016, 7(4): 275-280.

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Density Dependence of a Dominant Species and the Effects on Community Diversity Maintainance

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