Investigation And Analysis Of Ornamental Tree Species In The Residential Areas Of Qinhuangdao City

Residential green space plays an important role in people's daily life.To understand the application level of ornamental trees in residential areas of Qinhuangdao city at present and provide the basis for the application of ornamental trees in residential areas in the future.In this paper,the ornamental trees in eight newly built residential areas in Qinhuangdao city were investigated by sampling survey method.The conclusions are as follows:There were 106 species of ornamental trees belonging to 65 genera and 35 families in eight new residential areas in Qinhuangdao city.Among them,there were65 species of arbor belonging to 39 genera and 25 families,13 families 26 genera and38 species of shrubs,and only 1-3 species of woody lianas and bamboo.There were 6families and 62 species of plants,which accounted for 60.38% of the total ornamental trees in Qinhuangdao residential area.The application of arbor evergreen tree species was less mainly includes Pinaceae,Cupressaceae;deciduous arbor species applied family mainly including Rosaceae,Leguminosae,Aceraceae,Magnoliaceae,Saliviaceae,and other families of applications were less common.The evergreen shrub species mainly included Celastraceae,Buxaceae and Cupressaceae;deciduous species mainly included Rosaceae,Oleaceae and Caprifoliaceae.The plant community stability of green space in residential area was batter,the species of trees and shrubs were abundant,but the application of tree species was too concentrated,the species of tree was obviously more than the species of shrub,and the application of lianas and bamboo was less.The species of spring leaf trees accounted for 4.72% of the total species,while the species of autumn leaf trees accounted for 29.25% of the total species.The species of perennial leaved tree species accounted for 7.55% of the total species.The species of perennial green leaf trees accounted for 9.43% of the total species,while spring leaf trees were the least and autumn leaf trees were the most.Flower-watching plants accounted for 41.51% of the total species,fruit-watching plants accounted for11.32% of the total species,and limb-watching plants accounted for 3.77% of the total species.The average Patrick index of ornamental tree community was 40.25,arbor was 24.88,shrub was 13.88,woody vine was 0.88 and bamboo was 0.38.The average Simpson index of arbor was 0.916,shrub was 0.679.The average Shannon-Wiener index of arbor was 2.753,shrub was 1.539.The average Jsi index of arbor was 0.955,shrub was 0.734.The average Jsw index of arbor was 0.860,shrub was 0.588.The index of Simpson,Shannon-Wiener and Pielou of arbor were higher than that of shrub in every residential area.There were 17 families that have a application frequency of over 50 percent,accounting for 48.57% of all families,and28 genera that have a application frequency of over 50 percent,accounting for43.08% of all genera.The diversity of ornamental trees in residential areas was more uniform,but the diversity of individual residential areas was not high,and the level of plant diversity was quite different.