Study On Plants Diversity Of Xiashanyang Urban Wetlands Park In Huzhou Of Zhejiang Province

Huzhou Xishanyang National Urban Wetland Park an important part of the traditional water conservency system in south of Taihu Lake,is located in the center of the new and old urban greenway in Huzhou City,with elements of mountains,water,farmland and garden landscape,it’s wetland ecosystem is remained perfectly.The thesis studied throughly on vascular plants resources investigation,floristic analysis,plant community classification and typical plant community species diversity,to provide scientific basis on the construction and protection of Huzhou Xishan Yang National Urban Wetland Park.The conclusion are as follows:(1)There are 386 vascular plants species(including below grade species),which belong to 123 families and 309 genera in Huzhou Xishan Yang Urban Wetland Park,including 198 species of wetland plants,which accounts for 51.3% of the vascular plants;gymnosperm are 5 families 9 generas 11 species,dicotyledons are 82 families,198 genera and 244 species,is close to Hangzhou Xixi Wetland,pteridophyte are 15 families 17 genera 18 species,monocotyledons are 21 families 84 genera114 species,is higher than the Hangzhou Xixi Wetland,it’s wetland plant characteristics are more obvious.(2)Dominant families in Xishanyang Urban Wetland Park are Poaceae,Asteraceae,Cyperaceae,Polygonaceae,Fabaceae;and dominant generas are Polygonum,Echinochloa,Cyperus,Scirpus.Analysis on geography flora of genera showed that pteridophyte have 6 distribution type,and seed plants have 15 distribution types,it’s has a strong similarity compared with Xixi wetland,both of them are mainly Pantropic,North temperate and East Asia distribution type,but the proportion of Cosmopolitan type,Ropical type and China endemism type are higher than Xixi Wetland.(3)The dominant life form of vascular plant is herbage plant in Xishanyang Urban Wetland Park.There are 243 species of terrestrial herbs including perennial herbs,annuals and biennial herbs which account for 62.95% of total plant species;Aquatic plants are 40 species,accounting for10.36%.Wetland plant species is relatively low compared with the ecological types of Xixi wetland plants,but submerged plant and floating plant species is higher than Xixi wetland.(4)There are 10 families 18 species of alien invasive plants in Xishanyang Urban Wetland Park,accounting of 4.66% of the total plants species.There are 9 species of Asteraceae,accounting for50% of the alien invasive plant.Eichhornia crassipes,Alternanthera philoxeroides,Erigeron annuus,Bidens pilosa,appear frequently,and are widely distributed.They do great harm to the environment,effective measures must be taken to control or eliminate it in time.(5)The plant community in Xishanyang Urban Wetland Park was divided into 5 vegetation types,that is Mesophyte woody plant type,Mesophyte herb plant type,Hydrophytes plant type,Floating hydrophytes and Submerged hydrophytes plant type.Including 31 plant formations 50 plant community,in which ASS.Cinnamomum camphora,ASS.Phragmites australis,ASS.Echinochloa caudata,ASS.Alternanthera philoxeroides,ASS.Typha orientalis etc.are the most common and types in Xishan Yang Urban Wetland Park.Form the results of survey and the important value analysis of each species in the quadrat 14 typical plant communities,The proportion of wetland plants accounted for64.28% in dominate species of each typical plant communities,reflecting that the wetland plants has a high dominance in Xishanyang Urban Wetland Park.(6)By analyzing Margalef index,Simpson index,Shannon-Wiener index,and Pielou index of the typical plant communities the diversity,order and the relative are found similar in each typical plant communities,in which Echinochloa caudata+Setaria viridis communities,Polygonum lapathifolium var.Salicifolium+Alternanthera philoxeroides communities,Alternanthera philoxeroides communities,Phragmites australis communities,Zizania caduciflora communities had the higher diversity,its composition and structure is more complex,and the ecological stability is stronger;Thalia dealbata communities,Humulus scandens communities,Setaria viridis+Erigeron annuus communities,Ceratophyllum demersum communities had the lower diversity,its composition and structure is more simple,and the ecological stability is poorer.