Survey On Plant Diversity And Plant Community Landscape Evaluation In Shanghai Pujiang Country Park

Shanghai Pujiang Country Park is one of the seven pilot country parks in Shanghai,nearest to the city center and positioned as a suburban urban forest country park.A variety of studies were carried out in Pujiang Country Park,including statistical analysis of plant species,flora analysis,plant life type analysis,rare and endangered plant species analysis,plant native analysis,plant community α diversity index analysis,plant community similarity analysis,plant community diversity analysis,Landscape evaluation of plant community.The results are as follows:1.136 species of vascular plants in Shanghai Pujiang Country Park,Of 109 genera,63 families,Of which 13 are gymnosperms,123 angiosperms(104 dicotyledonous plants,Monocotyledonous plants(19 species).There are five dominant families.63 families of seed plants in country parks are classified in 10 distribution areas,More distribution types are: the world wide distribution of 22 families,Pan-tropical distribution of 18 families,North temperate distribution of 13 families,It also includes one family unique to China(Ginkgoaceae).2.54 species of trees in country parks,41 shrubs,Herbs 39,Two vines,Joe:irrigation: grass: rattan ratio is 27:20.5:19.5:1.44 species of broad-leaved species in arbor plants,There are 10 coniferous species.Of the 54 species,20 species of evergreen,34 deciduous species,The ratio of evergreen to deciduous leaves is 1:1.7.It is found that there are more deciduous trees in Shanghai and surrounding urban parks ’ green space than evergreen species,but a large proportion of evergreen trees among tree dominant species or tree species with high frequency is found.3.5 species of plants in Shanghai Pujiang Country Park belong to the national key protected wild plants,Ginkgo biloba I,Cycas revoluta I,Metasequoia glyptostroboides I,Cinnamomum camphora II,Zelkova serrata II.There are 82 native plants in Shanghai Pujiang Country Park,Of 45 families,74 genera,Local plants account for 60.3% of total species in Shanghai Pujiang Country Park,Non-native plants accounted for 39.7% of the total species.More attention should be paid in the construction of Pujiang Country Park.4.The Shannon-Wiener index is between 0.6932-2.0396,the Simpson index is between 0.5000-0.8510,the Pielou evenness index is between 0.8492-1.8637,and the species richness index is between 2-9.The change trend of Shannon-Wiener index between different samples is similar to that of Simpson index.The evenness index is in the range of0.8492-1.8637,the change trend is not big,and the whole has higher uniformity.5.The similarity of plant community structure,the overall Jaccard coefficient was in the range of 0-0.25,and the plant communities were very different.6.Tree importance ranking the top camphor,Cinnamomum camphora,Metasequoia glyptostroboides,Osmanthus fragrans,Salix babylonica,Ginkgo biloba.Shrubs are important to the front of Photinia x fraseri,Cercis chinensis,Rhododendron lapponicum,Punica granatum.Ground cover species are more important species are Rhododendron pulchrum,Nandina domestica,Osmanthus fragrans;herbaceous plants are more important are Aspidistra elatior,Acorus gramineus,Ophiopogon japonicus.Most of the plants in the country park grow well,only the newly transplanted trees grow slightly,and the good plant growth is related to the daily maintenance in the park,and also to the plant planning in the early stage of construction,that is,the application of native plants.After the construction of Pujiang Country Park,we can consider the dominant plant species of the surrounding urban parks.Enrich the species diversity and dominant plants under the premise of ensuring the plant adaptability,and can maintain the plant landscape style similar to the park green space in the surrounding areas.7.The comprehensive evaluation value of plant community landscape in Shanghai Pujiang country park is between 3.577-7.117.Landscape quality class I(excellent)has 0plots,Class II(good)has seven plots,23.33% of the total,Class III(general)has 21 plots,70% of the total,Class IV(poor)has two plots,It accounts for 6.67% of the total.Based on the above analysis,Landscape quality is mainly concentrated in class II(good)and class III(general),93.33% of total sample size,The landscape quality of plant community in Shanghai Pujiang country Park is in the middle level.Reference to related studies,the surveyed plant community of Shanghai Park is at the middle level.After the construction of Pujiang Country Park,the evergreen deciduous broad-leaved mixed forest community is mainly supplemented by pure forest community.