【摘要】 采用典型样地法对宁夏罗山国家级自然保护区4种主要森林类型（青海云杉林、青海云杉+油松林、油松林、山杨林）的群落结构特征与物种多样性进行调查与分析。结果表明：(1)共记录58种植物，隶属27科39属；(2)乔木直径分布呈倒“J”形和偏正态分布，树高结构均呈正态分布，均为稳定增长型群落；(3)森林群落由乔木层、灌木层、草本层组成，4种森林类型各层群落丰富度指数、Simpson优势度指数、Shannon-Wiener多样性指数、Pielou均匀度指数大小均依次为灌木层、草本层、乔木层，各层差异不显著（P>0.05）；乔木层和灌木层的植物多样性指数差异显著（P<0.05），草本层多样性指数无显著差异（P>0.05）。更多还原

【Abstract】 In order to explore the forest community structure characteristics and plant species diversity in Luoshan National Nature Reserve of Ningxia, four major forest communities(Picea crassifolia forest, Picea crassifolia – Pinus tabulaeformis forest, Pinus tabulaeformis forest and Populus davidiana forest) were investigated and analyzed by using the typical plot method. The results showed that:(1) a total of 58 plant species were recorded, belonging to 27 families and 39 genera.(2) The diameter distribution of the tree species exhibited a reversed J shape and a skewed normal distribution, while the tree height structure showed a normal distribution, indicating a stable growth pattern for the communities.(3) The forest communities consisted of tree layer, shrub layer, and herb layer.The richness index, Simpson dominance index, Shannon-Wiener diversity index, and Pielou evenness index of each layer ranked as follows: shrub layer > herb layer > tree layer. The differences between the layers were not significant(P > 0.05). The plant diversity index between the tree layer and shrub layer was significantly different(P < 0.05), while no significant difference was found in the herb layer(P > 0.05).更多还原