【摘要】 城市公园植物多样性是衡量公园绿化质量的重要指标之一。为研究扬州市城市公园植物多样性，选取11个代表性公园，采用典型样方法调查各公园密林区、建筑区和水景区3个功能区域乔木层、大灌木层和小灌木/草本层植物的种类及形态特征，并计算各层次植物多样性指数。结果表明：植物种类共128种，隶属于63科103属，1科1种占总数的62%。木本植物共106种，草本植物22种。乔木与灌木树种、常绿与落叶树种、乡土与外来树种的比值分别为0.66、0.86和1.57。各层次仅0～5种占据绝对优势，绝大多数植物在群落中的重要性、相对多度及使用频率较低。密林区乔木层和大灌木层的生物多样性和稳定性较高而小灌木/草本层的相对较低，水景区乔木层较低但小灌木/草本层相对较高，建筑区各层次群落稳定性处于中等层次。今后可通过完善密林区小灌木/草本层、水景区乔木和大灌木层的种类和数量，以及建筑区大灌木和水景区草本植物的利用率和均匀度来提高扬州市公园植物多样性和稳定性。更多还原

【Abstract】 The diversity of plant communities in urban parks is one of key indicators to evaluate the greening quality in parks. To study the plant diversity of the park in Yangzhou, 11 representative parks were studied. Three regions, i.e., plant thickset, building and water attractions, were investigated using the general sampling method. The species, characteristics and diversity were studied at the three levels of the communities, i.e., tree layer, large shrub layer, and the small shrub/herb layer. The results showed that the investigated 128 species(106 woody plants and 22 herbaceous plants) belong to 63 families and 103 genera. The ratios of trees to shrubs, evergreens to deciduous species, native to exotic species were 0.66, 0.86 and 1.57, respectively. Only 0-5 species had a significant advantage in each layer and the importance, relative abundance, and application frequency were low for most plants. The biodiversity and stability of the arbor layer and the large shrub layer in the plant thickset regions were relatively high, while the small shrub or herb layer was relatively low. The arbor layer in the water attractions regions was lower, but the small shrub or herb layer was relatively high. The diversity of the community in the building regions was at a medium level. In the future, we can improve the plant diversity and stability of Yangzhou parks by improving the types and quantity of small shrubs/herbs in the plant thickset regions, as well as the trees and large shrubs in the water attractions regions, increasing the utilization and uniformity of large shrubs and herb plants in the building and the water attractions regions.更多还原