Study On The Plant Community Structure And Ecological Effect Of The Major Parks In Zaozhuang City

City parks enjoy the reputation of the city's lungs,and the plant community is the basic unit of urban park,which is the foundation of the ecological function of the park,the scientific nature and rationality of plant community structure directly affect the development level of urban green space.Zaozhuang city is creating National Ecological Garden City,so it is of great practical significance to study the plant community of zaozhuang city.In this paper,83 typical plant communities of 3 urban parks in Zaozhuang are selected as the research objects.The indicators of species composition,species diversity index,community structure,leaf area index,green quantity,negative oxygen ion content and noise reduction rate were measured,the related data processing and analysis were carried out,and the typical plant community was evaluated comprehensively.The results showed that:1.There are 174 species of plant species in the plant community of 3 parks in Zaozhuang,belonging to 57 families and 116 genera.The families of Rosaceae,Oleaceae,leguminosae,Pinaceae,Cupressaceae,Gramineae and so on were widely used.According to the important value of plant community,the dominant species of tree layer is Ligustrum lucidum Ait.,the secondary dominant species are Cinnamomum camphora(L.)Presl.,Prunus yedoensis Matsum.,Koelreuteria paniculata Laxm.;the dominant species in shrub layer is Photinia×frasery Dress,the secondary dominant species is Sabina chinensis(L.)Ant,Euonymus fortunei(Turcz.)Hand.-Mazz.,etc.2.The main plant community types of 3 parks in Zaozhuang are mainly theropencedrymion,deciduous and evergreen broadleave forest.The arbor layer species in young adults period,evergreen trees accounted for 25%,accounting for about 55%of evergreen shrub,tree and shrub proportion is 4:2.4:1.The arbor-shrub-herb structure type community accounted for 80.8%,the arbor-herb structure type community accounted for4.8%and the arbor-shrub structure type community accounted for 7.2%.3.The structural factors of plant community in 3 parks in Zaozhuang were analyzed by principal component analysis.The plant canopy cover factor,species diversity factor,arbor layer trait factor,arbor layer canopy factor,community area,average height of herb layer and shrub layer average higher,etc.,7 factors are the main components that affect the plant community structure.The species richness,species evenness,Simpson diversity index,Shannon-Wiener diversity index and K value of the quantitative characteristics of plant communities all expressed as the arbor layer>shrub layer>herb layer.4.The study of the deciduous area index of the plant found that the canopy structure of the plant community was significantly different.The green quantity of a few communities was above 1500m~2,and the green quantity of most of the communities was concentrated in the range of 500-1500m~2.The average chest diameter and average height of tree species are the main factors affecting the green quantity of plant community.The concentration of negative oxygen ions in the plant community is concentrated in grade V(28)and grade IV(3),and have 7 plant communities of the Residual plant community have a concentration of negative oxygen ions close to grade IV.The plant community has a better noise reduction rate at 15m.With the increase of distance,the noise reduction rate is also increasing.5.The results of comprehensive benefit evaluation for typical plant community were grade I(6),grade II(9),grade III(13)and grade IV(3).It can be seen that more than half of the plant communities in zaozhuang urban parks are still at a relatively low level of comprehensive benefit,and only a few communities have good comprehensive benefits.