Study On The Characteristics Of Spontaneous Vegetation And Influencing Factors Of Public Perception In University Green Space In Hefei

Due to its strong reproduction ability,low intensity of management and maintenance and wild interest,spontaneous vegetation has gradually attracted the attention of society and academia.As the carrier of campus natural environment,college green space plays an important role in urban ecosystem.Based on the establishment time,location and landscape elements,237 spontaneous vegetation samples were selected from the green space of 4 typical universities by grid sampling method to investigate the composition,distribution and diversity characteristics of spontaneous vegetation in different universities and different habitats,and to construct a system of public perception and influencing factors.Combined with questionnaire survey,structural equation model was used to explore the influence path and degree of different factors on the perception of spontaneous vegetation,so as to provide a basis for optimizing the green space environment of colleges and universities and improving public satisfaction.Specific research conclusions are as follows:(1)There are abundant spontaneous vegetation in colleges and universities in Hefei,with a total of 158 species in 51 families,129 genera.Compositae and gramineae are the dominant families.In terms of life type,the proportion of annual herbs was the highest,and the proportion of grass rattan and biennial herbs was the lowest.There were 116 native plants,42 exotic plants,and invasion species accounted for a relatively high proportion.There was little difference among the dominant species of spontaneous vegetation in the green space of colleges and universities,and the distribution was the most extensive.Anhui Agricultural University had the highest community richness index,Shannon-Wiener diversity index and Simpson dominance index.Ustcm had the highest Pielou evenness index.The species similarity between Hefei University of Technology and University of Science and Technology of China was the highest.(2)The spontaneous vegetation communities showed different characteristics under different habitat conditions.The dominant understory species were mainly negative tolerant plants.Around the building,the low-rise type is most common,accompanied by fern growth.The spontaneous vegetation around the road square is mainly creeping.The growth of spontaneous vegetation in grassland and waterside habitat was more vigorous,and the proportion of exotic plants was higher.The Patrick richness index,Shannon-Wiener diversity index and Simpson dominance index of waterside habitat were the highest.The Pielou evenness index of grassland habitat was the highest.The habitat species similarity between the building and the road square was the highest.(3)The influencing factors of public perception were analyzed from three dimensions:individual characteristics,public cognition level of spontaneous vegetation,and visual attraction of spontaneous vegetation.Public perception includes two dimensions:emotional perception and emotional preference.According to the results of structural equation model,individual characteristics affect the public’s emotional perception of spontaneous vegetation,but have no significant effect on emotional preference.The level of public cognition to spontaneous vegetation and the visual attraction of spontaneous vegetation have significant effects on public emotional perception and affective preference.(4)In terms of the influence path of emotional perception,the standardization coefficient of visual attraction of spontaneous vegetation on emotional perception was the highest,indicating that the flower type,leaf type,plant type and pruning degree of spontaneous vegetation made the public have a higher favorable impression on spontaneous vegetation.In terms of the influence path of affective preference,the standardization coefficient of the cognition level of the public on affective preference was the highest,indicating that the higher the cognition level of the public on the spontaneous vegetation,the more inclined to choose the spontaneous vegetation community with higher coverage,more diversified species combination and more rich growing environment.