Species Composition and Association Characteristics of Vascular Plants in Jiangsu Nanjing Yangtze River Xinjizhou National Wetland Park
In the spring and summer of 2021,vegetation surveys were conducted to assess the vascular plant species composition and association characteristics in Jiangsu Nanjing Yangtze River Xinjizhou National Wetland Park.Using the line transect and quadrat methods,vascular plant species composition,floral composition and community diversity were investigated in typical habitats of the park,including small rivers,ponds and lakes in the islands,Yangtze River floodplain,swamp forests,herbaceous marshes,meadows,old fields and terrestrial forests.The results showed that there were a total of 437 vascular species belonging to 296 genera of 105 families,including 55 invasive species and 8 state-protected ones.Five families including Gramineae,Asteraceae,Cyperaceae,Fabaceae and Rosaceae had above or equal 20 species records.Nearly three quarters of the genera only had one-species record.Herbaceous plants,woody plants,lianas and bamboos respectively accounted for 76.66％,21.74％,1.14％and 0.46％of the species pool.Mesophytes,hygrophytes and hydrophytes respectively accounted for 57.44％,31.58％and 10.98％of the pool.Cosmopolitan type was the major floral component at the family level,whereas temperate and tropical areal types were the major components at the genus level.In spring,there were 18 major association types,among which Vicia sativa+Carex sp.+Phragmites australis association had the highest species abundance and the most diverse habitat types,and Rorippa globose+Geranium carolinianum and Geranium carolinianum+Leonurus artemisia associations had the highest species diversity indices.In summer,there were 23 major association types,among which Echinochloa sp.+Phragmites australis+Setaria viridis association had the highest species abundance,and together with Taxodium distichum forest and Setaria viridis+Cynodon dactylon+Conyza canadensis association they had the highest species diversity indices.In conclusion,Xinjizhou Wetland Park had a high level of vascular plant species diversity and a diverse floral composition,however with a considerable number of invasive species.The park was also rich in plant community types,which differed remarkably between spring and summer seasons.
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