| This paper takes the huanhuaxi park, the biggest opening park in Chengdu, as subject of the study.The plant disposition of it was investigated and community species composition,quantitative features,diameter class,vertical structures,seasonal aspects and species diversity etc were analyzed based on plant community theory.The characteristic of the ornamental was discussed,referring to the composition and characteristics of three scenic parks of ornamental flower,fruit,foliage and trunk plants..On the basis of research of that,a scientific reference of Construction of plant landscape in Chengdu of urban parks landscape construction was provide.(1)Measurements of 21 plant communities was dominated by arbor-shrub-herb, account for 90.48%.The sample is a total of 106 species belonging to 56 families 93 genera respectively. A higher proportion types of plants is Rosaceae, Leguminosae, Liliaceae, Gramineae, Magnoliaceae, Oleaceae.The indigenous trees of Chengdu are 65 species,61.32% of the total number of plants of sample,and there has been relatively little indigenous cover plants, account for 50% of all species of samples. The results of study of vertical structures and seasonal aspects of trees show that,the ratio of species of arbors,shrubs and ground covers is about 1:0.69:0.67,and the species of quantities evergreen and deciduous is 1:0.95.About a few species has high important value and application frequencies,in which arbor species are Cinnamomum camphora, Ginkgo biloba, Salix babylonica, Cinnamomum japonicum, shrub species are Ligustrum quihoui, Pyracantha fortunean, Rhododendron simsii, Pittosporum tobira, and ground cover species are Ophiopogon japonicus, Nephrolepis auriculata, Rohdea japonica.The density of the trees in Huanhuaxi park of the sample is 9.190 per 100m2,and most is 4.75 to 10 per 100m2,and the density of the the shrub is 68.405 per 100m2,and most is 6.00 to 37.50 per 100m2.8 sample fields of canopy density is 0.3-0.6 and 5 sample fields is 0.6-0.9 and another 7 sample field of canopy density is above 0.9.The results of study of diameter class of trees showed that, the DBH is 4.2-39.7 cm and the average breast-height of trees was 15.38cm and the DBH mainly concentrated lower 15 cm.As the DBH class progesses,while the numbers of the species of trees decrease.The studies of the diversity of plant communities have shown that, The average species richness, Simpson index, Shannon-Weiner index and Pielou index is respectively 11.524,0.873,1.585,0.615for plant communities.(2) From viewing properties,In the 21 plant communities be surveyed that the species of the flowers are more abundant and the species of ornamental trunk are least.There are 47 species of the flowers,20 species of ornamental fruit,30 species of foliages,11 species of ornamental trunk,respectively accounting for 44.34%,18.87%,27.36%,10.37% of all investigated plant species. The anthesis is mainly in spring and summer,the summer and autumn fruits species are most.The ornamental characters of three scenic spots is different. To flower-based concept more in Bailu park. Mei park mainly based on plants of leaf,in which ornamental leaf shape is more,and Color-leafed Plants is dominant in fall color trees. |
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