Vegetation diversity and its relationship with soil chemical factors in reclaimed wetland in Naolihe Nature Reserve
[Objective]This study aims to explore the changes of vegetation diversity and community characteristics with restoration years and the effects of soil chemical properties on vegetation diversity and community characteristics.[Method]This paper selected restored wetlands and natural wetlands in Naolihe Reserve in 2005,2014,2020 and 2021 as research objects,and calculated the vegetation diversity index.Soil organic carbon(SOC),available nitrogen(AN),available phosphorus(AP),soil water content(SWC),pH were determined,and the relationship between soil stoichiometric characteristics and vegetation diversity and community characteristics were analyzed.[Result](1)Soil SOC,AN and SWC showed an increasing trend,AP showed a decreasing trend,and pH showed no difference at different restoration stages.(2)A total of 57 species of plants from 43 genera and 21 families were identified,Among them,there were 12 species of Gramineae,accounting for 17.54%of the total vegetation species,10 species of Compositae were identified,accounting for 12.05%.There are 6 species of Polygonaceae and 4 species of Cyperaceae.With the increase of recovery years,the dominant species are annual herbs(Echinochloa crusgalli,Mentha dahurica,and Acalypha australi)to perennial herbs and typical wetland plants(Carex appendiculata and Phragmites australis)succession;(3)Plant biomass,community height and community coverage all increased with the increase of years of reforestation,while Margalef index,Shannon-Winner index and Simpson index decreased with the increase of years of reforestation.(4)SOC and SWC are important factors affecting plant community characteristics and plant diversity.[Conclusion]With the extension of restoration years,plant diversity and community characteristics are evolving into typical wetland plant communities.Soil SOC and SWC of reclaimed wetlands have important effects on the vegetation communities construction and the vegetation diversity of reclaimed wetlands.
Naolihe Nature Reserverestoring farmland to wetlandvegetation diversitysoil factors
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