重庆城市园林植物群落树木多样性研究

按绿地类型和干扰类型，分别调查了重庆城市园林植物群落，对比分析了各类型植物群落树木的优势度指数、加权平均物种数量、Simpson指数、Shannon指数等指标，结果表明：（1）城市园林植物群落乔木种类的多样性低于自然森林群落，但公园绿地群落乔木层的优势度最小，优势种数量较多；（2）城市园林植物群落的灌木种类少于自然森林群落；（3）城市中不同类型绿地植物群落的物种多样性依次为：公园绿地〉校园附属绿地〉道路绿地。在此基础上探讨了重庆城市园林植物群落营建工作中树木配置的生态学依据。

STUDY ON DIVERSITY OF TREE SPECIES IN GARDENING PLANT COMMUNITIES IN CHONGQING CITY

The weighted average tree species abundance,Simpson index,Shannon index and dominance index were analyzed for natural forest communities(evergreen broadleaved forest in the Jinyun Mountains),half-natural forest communities and some types of gardening plant communities dominated by trees.The number of dominant species of the arbor layer in the city is greater than that in the natural forest,while the arbor species diversity of plant community in the city is remarkably lower.Species abundance in the shrub layer of the natural forest is greater than that of the gardening plant community,and the species diversity of the communities in park green spaces is the richest of the three types in the city.Based on the results achieved,the ecological bases for tree configuration for the construction of urban plant community in Chongqing are discussed.