Study on Plant Community Structure in Urban Parks in Qingdao and Xuzhou

Investigations were implemented on 60 plant communities of 18 urban cities in Qingdao of Shandong province and Xuzhou of Jiangsu province both in the southern warm temperate zone. Studies on species composition and community structure, spatial distribution and seasonal aspects demonstrated that there were many community types with rich species diversity and seasonal aspects, dominated by deciduous species, but the highest importance value was evergreen species. Indigenous tree species in surveyed communities occupied more than 45%. Species richness index of arbor layer in Qingdao was a little higher than that of shrub layer, but that in Xuzhou was the opposite. Community lives in Qingdao were dominated by mixed forest of coniferous and broad leaf, while that in Xuzhou by mixed forest of evergreen and deciduous broad leaf. Spatial distribution was arbor-shrub-herb in the two cities.