调查分析了兰州市南河道园林观赏植物群落结构、优势种组成、物种多样性特征，以探究适合在兰州市南河道特定立地条件下生长的植物，为南河道景观提升改造提供理论依据。研究结果显示，南河道园林观赏植物共有20科34属48种，其中以蔷薇科观赏植物占有绝对优势，为9属16种。绿地植物配置以乔灌结合为主，其乔木层丰富度指数、Simpson指数、Pielow均匀度指数和生态优势度分别为0.395 2、0.930 4、0.865 0、0.530 4，灌木层分别为0.309 2、0.909 0、0.817 0、0.297 0，乔木层的多样性、复杂程度与均匀度都要大于灌木层。南河道绿地乔木层丰富度指数、Simpson指数、Pielow均匀度指数和生态优势度均以范家湾桥到入河口段绿地最高；灌木层丰富度指数以南面滩桥到范家湾桥段绿地最高，Simpson指数和Pielow均匀度指数均以范家湾桥到入河口段绿地最高，生态优势度以金花桥到南面滩桥段绿地最高。蓝天桥到张苏滩桥绿地中植物多样性指数均最低。

Through the investigation of the community structure， dominant species composition and species diversity characteristics of ornamental plants in Nanhedaogardens in Lanzhou， this paper explores the plants suitability for growing in the specific site of Nanhedao gardens in Lanzhou city，and provides a theoretical basis for the landscape upgrading and reconstruction of Nanhedao. The results demonstrated that there were 48 species of ornamental plants belonging to 34 genera and 20 families in Nanhedao gardens， among which rosaceae ornamental plants were the most dominant with 16 species belonging to 9 genera. The richness index， Simpson index， Pielow evenness index and ecological dominance index of arborous layer were 0.395 2， 0.930 4， 0.865 0 and 0.530 4， respectively， and shrub layer were 0.309 2， 0.909 0， 0.817 0 and 0.297 0， respectively. The diversity，complexity and uniformity of arbor layer were greater than those of shrub layer. The highest arborous layer richness index， Simpson index， Pielow evenness index and ecological dominance index were found in the area from Fanjiawan bridge to the estuary of Yellow River. The shrub richness index was the highest in the green belt from Nanmiantan bridge to Fanjiawan bridge， Simpson index and Pielow evenness index were the highest in the green belt from Fanjiawan bridge to the estuary， and ecological dominance was the highest in the green belt from Jinhua bridge to Nanmiantan bridge. The lowest plant diversity index was found in the green belt from Lantian bridge to Zhangsutan bridge.

S713.2

兰州市科技局科技计划项目“兰州市南河道园林观赏植物及景观配置模式调查研究”(2021SHFZ0021)。