Study On The Characteristics Of Plant Community And Landscape Evaluation In Heze City Parks

Urban park is an important part of urban green space,which can regulate the urban ecological environment and is one of the important supports to relieve the pressure of urban environment in the rapid urbanization process.As the basic unit of urban park green space,the rationality and stability of its own structure have a great impact on the ecological benefits of park green space.Good plant community construction can make the urban park green space better play its function of improving and beautifying the environment.Therefore,it is necessary to investigate,evaluate and analyze the plant community landscape in urban park,and to study the scientific and reasonable plant community landscape configuration.Based on the research progress of the plant community characteristics and landscape evaluation of the relevant urban parks at home and abroad,and the full retrieval and collection of the relevant information in Heze Park,the paper selects 250 representative plant community landscape plots in each park,taking the peony garden,Zhao Wang River Park,Tianxiang Park,ring City Park and Xintiandi public park in Heze as the research objects.,the landscape characteristics of plant communities in each park are analyzed,the plant species diversity is calculated and compared,and AHP method and SBE method are used to evaluate and analyze the landscape of plant communities respectively.Finally,based on the current situation,the existing problems are analyzed and optimization suggestions are put forward.The main research results are as follows:1.Study on the characteristics of plant community in park green spaceAmong the 250 landscape sample plots of plant community,there are 153 species belonging to 109 genera,56 families,including 12 species belonging to 7 genera,4 families of gymnosperms,124 species belonging to 86 genera,49 families of angiosperms,17 species belonging to 16 genera,3 families of monocotyledons,31 species of evergreen plants,122 species of deciduous plants,the ratio of evergreen to deciduous plants is 1:3.94;arbor,shrub and grass There are 71 species,41 species,33 species,6 species and 2 species for this plant,woody liana and bamboo respectively.The dominant families of plants in the park are obvious,and the single family > small family > larger family > middle family;the ornamental characteristics of plants: composite ornamental plants > ornamental plants > ornamental plants > ornamental plants > foliage plants;the vertical structure type of plant community landscape sample site:arbor shrub grass type > Arbor shrub type > arbor grass type > arbor shrub type > shrub grass type = grass type;the overall type of plant community landscape sample site is in decline Broadleaf forest,coniferous broadleaf mixed forest and evergreen deciduous broad-leaved mixed forest are the most,accounting for 88.40% of the total,and other plant community types are relatively less;the closure type of plant community landscape sample site: medium closed forest > dense forest > sparse forest;the park plants are mainly young and young plants in general;the growth condition is generally good and the growth trend is high,but some of the park plants are not managed in the later period When and so on,causes the plant growth health condition to be bad.2.Species diversity analysisThe dominant species of plant trees,shrubs and ground cover were obvious.The dominance degree of dominant species in some parks was too high.The Margalef species richness index R,Simpson diversity index and Shannon-Wiener index H in each park were ranked as tree layer > shrub layer > ground cover layer,and the parks were all Xintiandi Park >Cao Zhou peony garden.Pielou uniformity index Jsw: except for Zhao Wang River Park,all layers are tree layer > shrub layer > ground cover.Zhao Wang park is shrub layer > ground cover > tree layer.Park is Xintiandi Park > Cao Zhou Peony Garden > Tianxiang Park > ring City Park > Zhao Wang River Park;Park plant community similarity coefficient is small.At 0.5,they all showed moderate dissimilarity.3.Plant landscape evaluationThe results of the evaluation of plant community landscape by AHP method: 8.00% of the park’s class I plant community landscape samples(4),56.00% of the park’s class II plant community landscape samples(28),36.00% of the park’s class III plant community landscape samples(18),and no class IV plant community landscape samples exist in the park;SBE method:SBE value of the park’s plant community landscape samples The values range from-0.9151 to0.6641,of which 54.00% of the plant community landscape samples(27)have a positive SBE value and the rest(23)have a negative SBE value.There is still a large space for the improvement of the plant community landscape in Heze City Park.The results of AHP and SBE are the same on the whole,but there are also great differences.The main reason is that AHP has pertinence,scientificity and systematization in three aspects of ecology,landscape and recreation,while SBE focuses on visual effect.According to the above content,this paper summarizes and analyzes the existing problems of Heze City Park plant community landscape,and puts forward corresponding optimization measures according to the principles of Park plant community landscape construction.