Investigation And Landscape Evaluation Of Three-Dimensional Greening Plants In Nanning City Park

In this paper,15 urban parks in Nanning city are selected as the research object,and based on the field investigation,the main forms and plant resources of three-dimensional greening of the parks are firstly counted and analyzed;then,the three-dimensional greening plant landscape of the park were evaluated synthetically by the AHP method;finally,the three-dimensional greening plants and their landscape characteristics are summarized,and the problems and suggestions are put forward.The main results are as follows:1.The statistical results of three-dimensional greening plant resources in the park show that:(1)The three-dimensional greening forms are wall greening,corridor greening,fence greening,tree greening,rockery greening and slope protection greening.(2)There are 306 species of three-dimensional greening plants,belonging to 95 families and 193 genera,among them,there are 28 kinds of ferns that belong to 16 families and 18 genera,3 kinds of gymnosperms that belong to 3 families and 3 genera,and 275 kinds of angiosperms that belong to76 families and 172 genera;The three parks with the largest number ofthree-dimensional greening plant species are Qingxiushan Scenic Spot(178species),Yongjiang North Bank Park(76 species),and Guangxi Medicinal Botanical Garden(60 species);According to the number of plants,the six types of three-dimensional greening are: rockery Greening(136 species)> slope protection greening(95 species)> wall greening(90 species)> corridor Greening(86 species)> tree Greening(55 species)> fence Greening(18species).(3)The families with multiple seeds include orchidaceae,liliaceae,leguminosae,gramineae,araceae and asclepiadaceae.(4)Families and genera are mainly distributed in the tropics,which reflect the distinct tropical nature of three-dimensional greening plants in Nanning City Park.(5)The life forms include arbors(33 species),shrubs(43 species),bamboos(5 species),vines(90species),herbs(135 species),and they account spectively for 10.78%,14.05%,1.63%,29.41% and 44.12% of the total species.Among them,vines and herbs are dominant.The ratio of evergreen plants to deciduous plants is about 4.75:1.(6)According to climbing methods,lianas can be divided into six types: twining type(21 species),curling type(18 species),adsorption type(24 species),attachment type(11 species),creeping type(6 species)and mixed type(10species),accounting for 23.33%,20.00%,26.67%,12.22%,6.67% and 11.11%of the total species of liana,respectively.(7)There are 90 species of epiphytes,accounting for 29.41% of the total species,including 82 species of epiphyte seed plants and 8 species of epiphyte ferns,accounting for 91.11% and 8.89% of the total species of epiphyte respectively;According to the types of epiphytes,theycan be divided into obligate epiphytes(55 species),facultative epiphytes(33species),and accidental epiphytes(2 species),accounting for 61.11%,36.67%and 2.22% of the total species of epiphyte respectively.(8)In parks,the most frequent plant for wall greening is parthenocissus dalzielii,for gallery greening and fence greening are both bougainvillea spectabilis,for tree greening is syngonium podophyllum,for rockery greening is nephrolepis auriculata and eremochloa ciliaris,and for slope protection greening is wedelia chinensis.(9)There are 175 species of flowering plants(57.19%),and 39 species of colorful leaf plants(12.75%).(10)There are 163 kinds of exotic plants(53.27%),and 143 kinds of native plants(46.73%),which indicates that Nanning Park lacks the application of native plants in the construction of three-dimensional greening plant landscape.2.AHP method is used to construct an evaluation index model which includes three factors: ecological quality,aesthetic quality,social and functional quality to evaluate the three-dimensional greening plant landscape of Nanning City Park,the results are as follows: The grade of three-dimensional greening plant landscape of the parks is grade III,which is in the middle level;Among the60 selected three-dimensional greening plant landscape evaluation sample points,there are 4,19,18,17 and 2 sample points with landscape grade I,II,III,IV and V respectively,accounting for 6.67%,31.67%,30%,28.33% and 3.33% of the total number of evaluation sample points;The landscape grade for rockery greening is grade II,for wall greening,corridor greening and slope protectiongreening is grade III,and for fence greening and tree greening is grade IV.3.According to the investigation and evaluation results,seven characteristics and seven main problems of three-dimensional greening plants and their landscapes in Nanning City Park are summarized,and corresponding suggestions are given.