| Native plants grow naturally in specific areas,reflecting the native natural features,habitat changes and cultural customs.However,at present,native plants are seldom used in cities,and there are many problems,such as single landscape,convergence of greening,distortion of plant aesthetics,etc.The resources of karst native plants in Baise border counties and cities in Guangxi are abundant and rarely used.In this study,the wild plant resources in this area were investigated,and the corresponding comprehensive evaluation model of gardens was established by AHP.The selected native ornamental plants in karst area were evaluated,and the species with high comprehensive development potential were obtained,so as to provide clear and complete information of karst native plant resources in Baise,and promote the application and development of native plants in this area.The main research results are as follows:(1)During the field plant investigation in the study area,1 new species,1 suspected new species,1 newly recorded plant in China and 3 newly recorded plants in Guangxi were found,and the genus ceropegia was classified and revised,including 2 species in the study area.(2)This study recorded 678 species of native karst plants belonging to 374 genera and 128 families in the study area.Among them,there are few gymnosperms,only 6 species belonging to 5 genera in 4 families.103 species of ferns belonging to 44 genera in 20 families,and angiosperms account for a large proportion,with 569 species belonging to 325 genera and 104 families.There are 15 dominant families(with more than 10 members)and 16 dominant genera(with more than 5 members).(3)584 ornamental plants with great development potential in the study area were preliminarily screened,and they were classified and analyzed from three aspects of landscape application(planting strategy,application in different scenes and application of flowers).There were 11 types in total,namely,trees and shrubs planted alone(131 species),vertical greening(268 species),hedgerow(35 species),ground cover(158 species),plastic ornamental(152species),waterscape ornamental(115 species),bonsai ornamental(196 species),stone landscape ornament(383 species),flower border(316 species),flower beds and ribbons(89species),cut flowers(82 species).(4)Through an expert questionnaire survey,an evaluation model was established for 584 native ornamental plants in the study area by using the analytic hierarchy process(AHP),and their comprehensive scores were calculated and graded respectively.Finally,55 kinds of I-class karst native ornamental plants,177 kinds of II-class,255 kinds of III-class and 97 kinds of IVclass ornamental plants were obtained.The contribution rate of constraint layer score and ornamental period of native ornamental plants in class I karst were analyzed.(5)The regional characteristics and conservation value of native ornamental plants in karst areas were analyzed,and some plants with outstanding regional characteristics were divided into three categories,namely,152 species endemic to China(99 species),Guangxi(39 species)and study areas(14 species).Through literature review,it is determined that there are 34 national key protected plants in karst native ornamental plants in the study area,of which 6 are under first-class protection and 28 are under second-class protection.Finally,the list of native ornamental plants in karst and some illustrations of I-class native ornamental plants in karst were compiled,which provided reference for the development of native plants in the study area. |
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