石人山自然保护区秦岭冷杉群落物种多样性和稳定性研究

The Species Diversity and Stability of Abies chensiensis Community in Shiren Mountains Nature Reserve

利用20个样地资料,对石人山自然保护区的秦岭冷杉群落物种多样性和稳定性进行了研究,结果表明:5个群落的物种丰富度指数、多样性指数和均匀度指数均存在一定差异,且它们明显受群落类型和群落结构的影响,群落结构越复杂,物种丰富度指数和多样性指数就越大,均匀度指数就越小;5个秦岭冷杉群落各生活型的物种多样性指数间存在着一定的差异,但是差异不一定具有统计学意义;利用改进的M.Godron稳定性测定方法测得的5个群落的稳定性都极低,而且群落的稳定性和多样性之间没有明确的关系,说明群落都处于一定的动态变化中。

Species diversity and stability of Abies chensiensis communities in Shiren Mountains nature reserve was studied in this paper. A set of data total 20 plots were used. The results showed that the differences of the richness indices, diversity indices and evenness indices a mong different communities were great. The diversity indices and richness indices of the plant communities were obviously affected by the type and structure of the communities. The more complicated of the structure, the bigger of the diversity indices and richness indices and the smaller evenness indices included. There was a greater variation in species diversity among different life form. However, It was found that this variation was not always statistically significant. The results of community stability calculated by improved M. Godron method were very low. Furthermore, there is not a clear relation between the stability and diversity of the communities. This showed that the five types communities were all in the process of succession in various degree. This study is important to protect A. chensiensis community in Shiren Mountains nature reserve.