| Park green space is an important part of urban green space system.With the acceleration of urbanization and industrialization,urban environmental carrying capacity is approaching the extreme value,and people’s increasing need for comfortable and beautiful living environment is more intense than ever before.On the basis of summarizing the theories and practices related to urban park plants and their landscapes at home and abroad,this paper takes Xiangsi Lake Park of Nanning as the research object,adopts the field survey method,sample plot survey method and AHP-fuzzy comprehensive evaluation method to explore the plant resources and diversity characteristics of the park as well as the community landscape quality,and summarizes the landscape characteristics.Analyze the main problems and put forward the preliminary suggestions for the park and other parks plant landscape planning,construction and management to provide a scientific basis.The main research results are as follows:1.There were 255 species of vascular plants in 87 families,202 genera,including 7 families,7 genera,7 species of ferns,5 families,5 genera,5gymnosperms,and 243 species of angiosperms in 75 families,190 genera.Gramaceae,Moraceae,palmiaceae and sappanaceae are the dominant plant communities in the park.There were 151 species of woody plants,86 species of herbaceous plants,8 species of bamboo plants and 10 species of lianas.The ratio of evergreen trees to deciduous trees is 1:0.24.Native woody plant index0.5.There are 205 species of ornamental plants,mainly foliage,flower and form plants,accounting for 80.00% of the total number of ornamental plants.There were 37 species of wetland plants,accounting for 14.51% of the total plant species in the park.The park green space has flowers to enjoy all seasons,with considerable fruit,showing the characteristics of South tropical plant landscape.2.The artificial plants in Xiangsi Lake Park of Nanning were mainly in the form of Joe-irrigation-grass,accounting for 67.35%.The important values of Bauhinia variegata,Bougainvillea spectabilis and Ophiopogon bodinieri rank first in tree layer,shrub layer and herb layer,respectively,and play an important role in plant community level.The α-diversity index of plant community at all levels was in the order of tree layer > shrub layer > herb layer.The α-diversity index of plant communities in the eastern area was consistent with that of the park as a whole.The Patrick index and Shannon-wiener index of plant community in the western area showed the order of tree layer > shrub layer > herb layer,and Simpson index and Pielou index showed the order of tree layer > herb layer > shrub layer.The Patrick index of artificial plant community was significantly correlated with Simpson index,Shannon-wiener index and Pielou index.3.The overall evaluation grade of landscape quality of artificial plant community in Xiangsi Lake Park of Nanning was Grade II(Good),with a comprehensive score of 7.6360.The evaluation level of landscape quality in the east and west areas of the park is not the same;The landscape quality evaluation grade of the East area was Grade III(medium),and the comprehensive score was 7.4714.The landscape quality evaluation grade of the western area was Grade II(good),and the comprehensive score was 7.7087.The evaluation results of single artificial plant community landscape quality showed that there were 6 community landscapes of grade I.There were 24second-class community landscapes.There were 19 class III landscape communities,but no Class IV landscape communities were found in the park. |
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