Study On The 3D Green Quantity And Ecological Effect Of The Five Kinds Of Mainly Landscape Plant In Chengdu

Over the past two decades,both at home and abroad to improve the city's ecological environment of the common idea is promoted to crop green plants,so that the return of green cities, give full play to the plants in improving the role of the surrounding environment.Due to the different characteristics of different tree species,their leaf area,branching manner,the volume, Canopy density and High crown with different,resulting in differences in the amount of 3-D Green Quantity,Ecological functions that directly affect their play-effective.How high-density living environment to make full use of green space and improve the green structure,to increase the total green leaf area and 3-D Green Quantity,Architects of all the practical problems need to be resolved urgently.3-D Green Quantity can be relatively objectively reflect the real green eco-environmental benefits of entities to avoid the Unreasonable caused by 2-D Green Quantity and too high estimates of eco-efficiency brought about by the defects,in order to objectively evaluate the value of urban green space has a practical significance.In this study,choice the city of Chengdu in Sichuan,a representative for the study area,select the five Commonly used landscape trees as Study objective,such as Osmanthus fragrans,five plants are the dominant species,their have Good ecological adaptability,which used to be a large number of cities in Sichuan and Beautify the city and improve the living quality of the environment play an important role in.The establishment of five trees of 3-D Green Quantity of the regression equation by Determination of 3-D Green Quantity with leaf area,On this basis,carry out quantitative measurement of eco-efficiency,Such as the fixing carbon and release oxygen ability, transpiration rate and Dust ability.Through the 3-D Green Quantity and crown shape indicators, such as crown,as well as the correlation between eco-efficiency analyses,identify its relevance. Major results are as follows:1.The establishment of the five main species of 3-D Green Quantity of the regression equation.2.The order of the 3-D Green Quantity from high to low among the five trees is:Ligustrum Vicaryi＞Osmanthus fragrans＞Elaeocarpus sylvestris＞Ficus microcarpa＞Cinnamomum japonicum;The order of the average leaf area per plant from high to low among the five trees is: Ligustrum Vicaryi＞Elaeocarpus sylvestris＞Osmanthus fragrans＞Cinnamomum japonicum＞Ficus microcarpa;The order of the average leaf area per unit volume from high to low among the five trees is:Cinnamomum japonicum＞Elaeocarpus sylvestris＞Ficus microcarpa＞Osmanthus fragrans＞Ligustrum Vicaryi.The correlation analysis of 3-D Green Quantity and leaf area have reached more than 0.8 in five trees.3.The order of the CO₂-Fixing and O₂-Emiting daily of per Unit leaf area from high to low among the five trees is:Cinnamomum japonicum＞Ligustrum Vicaryi＞Elaeocarpus sylvestris＞Osmanthus fragrans＞Ficus microcarpa;The order of the CO₂-Fixing and O₂-Emiting daily of per unit volume from high to low among the five trees is:Cinnamomum japonicum＞Elaeocarpus sylvestris＞Ligustrum Vicaryi＞Osmanthus fragrans＞Ficus microcarpa.The order of the effects of transpiration rate and cooling capability daily of per unit leaf area and volume from high to low among the five trees is:Cinnamomum japonicum＞Ligustrum Vicaryi＞Ficus micrucarpa＞Elaeocarpus sylvestris＞Osmanthus fragrans.The order of the ability of dust retention daily of per unit leaf area and volume from high to low among the five trees is:Cinnamomum japonicum＞Ligustrum Vicaryi＞Osmanthus fragrans＞Ficus microcarpa＞Elaeocarpus sylvestris.Comparison of 3-D Green Quantity of plant eco-efficiency of five trees.The above results Come to the conclusion:1.3-D Green Quantity of the five tree species of Dualistic regression equation is higher than the accuracy of One-Yuan regression equations,and with the crown of the most relevant2.The trend of positive correlation with 3-D Green Quantity and leaf area,But should also be determined by the Crown with leaf density,The greater leaf density,the greater the amount of 3-D Green Quantity.3.The trend of positive correlation with 3-D Green Quantity and Eco-efficiency,That is,the greater the 3-D Green Quantity,the better its overall eco-efficiency.