青海大通山区5种不同类型人工林下植被物种多样性比较

Comparative of species diversity of five types of plantations in the mountainous area of Datong in Qinghai province

采用标准样地调查法,对青海大通山区5种不同配置、不同林分人工林下植被物种多样性进行定量研究。结果表明,在海拔、林龄、坡向、坡位等因素基本相同的情况下,不同林分人工林下的草本及灌木的物种丰富度指数、多样性指数变化趋势大致相同,从大到小的顺序依次为针阔混交林>阔叶林>针叶林>针叶混交林;垂直结构物种多样性方面,5种人工林草本层植物丰富度、多样性指数均高于灌木层,但均匀度指数却低于灌木层,表明目前青海大通山区人工林下植被以草本植物为主,灌木植植相对稀少的外貌特征。在对不同类型人工林进行物种多样性分析的基础上,提出了基于物种多样性的人工林管理措施。

This study investigated five kinds of different configurations on the mountains in Datong of Qinghai, under different typies of forest plantation species diversity in a quantitative way using the standard method of sample survey. The results showed that if elevation, age of the plantations, aspect, slope position and other factors were basically the same, the plantations of different stand of herbaceous, shrub species richness index and diversity index roughly showed the same trend, where the order was mixed coniferous and broadleaf forest 〉 coniferous forest 〉 coniferous mixed forest; As for vertical structure of species diversity, the richness and diversity indices of five kinds of herbaceous plantations, were higher than the shrub layer, but the evenness index was lower than the shrub layer, indicating that under the status quo plantation on the mountains in Qinghai Datong, herbaceous plants shrub vegetation was relatively scarce. On the basis of analysis in species diversity of the different types of plantations, plantation management measures was proposed.