中文摘要：

以多伦县沙地云杉林3条样带的群落调查数据为基础,研究了沙地云杉混交林的物种组成结构,分析了3个典型群落乔木层、灌木层、草本层的物种多样性。结果表明：沙地云杉混交林植物种类丰富,乔木层、灌木层、草本层共有植物71种,群落垂直结构分层明显;多伦县沙地云杉与白桦混交林物种多样性较丰富,在群落梯度上,群落Ⅰ为52种,群落Ⅱ为45种,群落Ⅲ为47种,物种丰富度指数大小顺序为群落Ⅰ〉群落Ⅲ〉群落Ⅱ;群落的物种多样性指数变化规律大致相同,均为草本层〉灌木层〉乔木层;3个典型群落的物种均匀度指数变化规律基本一致,为乔木层最大,灌木层其次,草本层最小。通过对多伦县沙地云杉混交林物种多样性的研究,为加强沙地云杉生物多样性的保护和经营管理提供理论依据。

英文摘要：

Based on the community survey data of three standards sites in Duolun County, the species composition has been studied, and the species diversity of the three typical communities of Picea mongolia mixed forest has been analyzed and compared. The results show that the plant species of Picea mongolia mixed forest is very rich in Dualun County, which there are 71 kinds of plants in tree layer, shrub layer and herbaceous layer, and the community vertical stratification structure is obvious. The species diversity of mixed forest of Picea mongolia and Betula platyphylla in Duolun County is rich, for the gradient in the community, the community I is 52 species, community II is 45 species and community III is 47 species. The order of species richness index is community I 〉 community III〉 community II. The changing law of species richness index in the community is roughly ceous layer 〉 shrub layer 〉 tree layer. The changing law of species evenness index of three same, that is herbatypical community is roughly same, that is tree layer 〉 shrub layer 〉 herbaceous layer. The study on the species diversity of Picea mongolia mixed forest in Duolun County can provide the theoretical basis for strengthening the protection and management of the biodiversity of Picea mongolia.