Study On Landscape Evaluation Of Plant Communities In Green Space Of Some Universities In Hohhot

The plant community in universities is an important part of campus environment,which plays the role of landscape construction,space composition,ecological protection and physical and mental recovery.Through the landscape evaluation of plant community in universities,the thesis analyzes the structure and elements of plant community,and the relationship between evaluation results and landscape elements,in order to improve the construction of green space in universities.The research takes plant communities in Hohhot Vocational College,Inner Mongolia Vocational College of Electronic Information Technology,Inner Mongolia Vocational College of Commerce and Trade,Inner Mongolia Vocational College of Mechanical and Electrical Technology,Inner Mongolia Vocational College of Chemical Industry,Inner Mongolia Vocational College of Commerce and Trade,Inner Mongolia Vocational College of Architecture and Technology,Inner Mongolia Normal University Youth College of politics which are in the south foot of Daqing mountain in Hohhot as examples,50 scales of 20 m×20 m representative plant samples were investigated,the basic characteristics of the plants were investigated and the landscape was recorded.The investigation includes the plant life type,plant community type,plant community structure and community spatial form.The aesthetic preference and psychological recovery prediction method are used to evaluate the landscape of the sample by photos,the worst and the best samples in the same space form are compared to explore the reasons for the difference of the evaluation results.Then,the relationship between the evaluation results and landscape elements is studied by multiple regression method.The main results of this thesis are as follows:(1)There are 77 species of green space plants in the south of Daqingshan University.Among them,40 species of trees,8 evergreen trees,32 deciduous trees,15 shrubs,1evergreen shrubs,14 deciduous shrubs,11 ground cover plants and 11 herbs;There are three types of plant community,which are deciduous broad-leaved forest,evergreen coniferous mixed forest and deciduous broad-leaved forest and shrub flower cluster.Among them,7 deciduous broad-leaved forests,41 mixed evergreen coniferous and deciduous broad-leaved forests,2 shrubs and flowers.Most of the plants are planted artificially,and some areas retain native plants;Most of the community structure is the type of tree shrub grass.Among them,the mean density of plants is 739,the average coverage is 57%,the relative height is 32%,the leaf area index is 3.34,the richness is 1.52,the diversity is 1.30,the evenness is 0.76,the monotony is 0.38,the angle scale is 0.54,the mixing degree is 0.44,and the size ratio is 0.49.The plants in the community were randomly distributed,and the mixing degree and size ratio were in the middle;There are five types of spatial forms of plant community,which are open space,closed space,covering space,open space and vertical space.Among them,there are 25 semi open spaces,17 closed spaces,3 covered spaces,2 open spaces and 2 vertical spaces respectively;(2)The comprehensive evaluation results of aesthetic preference and psychological recovery of green plant community in the south of Daqingshan University show that the comprehensive quality of landscape of the Youth Political College of Inner Mongolia Normal University is poor,and the landscape of Inner Mongolia Construction Vocational College and university city is better than Inner Mongolia Chemical Vocational College and Inner Mongolia North Technology College.Meanwhile,the correlation analysis shows that the relationship between aesthetic preference and psychological recovery is high,and the comprehensive level is influenced by aesthetic preference and psychological recovery.Through the comparative study of plant communities in the same spatial form,the comprehensive evaluation of the community with better growth potential,clear plant outline,Bush pruning,reasonable arrangement of trees and irrigation,and rich seasonal changes is better;(3)Among the quantitative landscape elements,the influencing factors of aesthetic preference are X9(proportion of evergreen trees),X11(mixing degree),X12(size ratio),and landscape model is: aesthetic preference =-4.868 + 3.043 X11 + 1.262X12 +1.909X9;The factors influencing mental recovery were X9(proportion of evergreen trees),X11(mixed degree),X8(single tree species scheduling),and landscape model was:psychological recovery =-5.079 + 3.280X11 + 1.687X9 + 0.373X8;The factors influencing the comprehensive quality are: X9(ratio of evergreen trees),X11(mixing degree),X8(single tree species scheduling),and landscape model is: comprehensive quality =-9.947 + 5.323X11 + 1.596X9 + 0.635X8.Among the qualitative landscape elements,the influencing factors of aesthetic preference are: X2(sense of hierarchy),X4(sense of balance),X13(outline clarity),X16(canopy texture),X22(cleanliness under the forest),X25(richness of ground cover plants),X29(activities and sight space in the forest),The evaluation model is as follows: aesthetic preference = 11.581-1.587X4-1.526X25-1.045X16-1.020X2 + 1.227X13-1.322X22 + 0.637X29;The factors influencing psychological recovery were: X4(sense of balance),X25(abundance of ground cover),X16(canopy texture),X17(texture difference),X21(turf quality).The landscape model was: psychological recovery = 16.860-1.370X4-1.152X25-1.860X16-1.159X17-1.221X21;The factors influencing the comprehensive quality are: X4(sense of equilibrium),X25(abundance of ground cover plants),X16(canopy texture),X2(sense of hierarchy),X13(outline clarity),X22(cleanliness under the forest).The landscape model is: comprehensive quality = 26.168-3.275X4-2.837X25-2.677X16-2.653X2 +3.368X13-1.949X22.Therefore,in quantitative landscape elements,aesthetic preference and psychological recovery emphasize the difference of plant size,the latter emphasizes the monotony of tree species,and the comprehensive quality and psychological recovery influence factors are the same;In qualitative factors,aesthetic preference compared with psychological recovery,the former emphasizes the level,outline clarity,the cleanliness of the forest and the activities and sight space in the forest.The latter focuses on the difference of texture and turf quality,which shows that the quality of lawn has a great influence on psychological recovery.The factors of comprehensive quality are similar to aesthetic preference,lack of space of activities and sight in the forest,and the same as some of the factors of psychological recovery.Through field investigation and landscape evaluation,the research conclusion is expected to be used in the optimization of the green plant community and the construction of the green space in the same conditions in the south side of Daqingshan University in Hohhot.