Jiaonan Landscape Trees And Shrubs, Investigation And Planning

The planning of trees serves for the afforested construction. The scientific planning of the type of trees could increase the ornamental effect of garden plants,creat exquisite and persistent garden landscape, promote combined earnings, for example, society and economic benefits.,fit better for the garden afforested need of Jiaonan city.So it is important to plan the type of garden trees. The planning job of trees and shrubs should carry on the basis of the investigation result.It would consider fully natural condition in the district, then it would be worked out according to the planning principle and put forward more suitable adjusting direction according to the analysis of the real investigation result and suitable planning theory. The paper plans the selection range,fundamental trees and backbone trees on the basis of real condition in the planning type of garden trees in Jiaonan. Also, the paper put forward suggestion according to the investigation result. Four aspects will be discussed fully as follows.First aspect is the planning principle. Jiaonan, where there is by the seaside of the Huanghai Sea, is a national travelling city. Therefore the type of trees should have seaboard character. They are fundamental trees for example Pinus thunbergii that could resist sea-breeze and sea-fog. Fraxinus chinensis that grow in saline soil Juiperrus chinensis,and so on.So characteristic scene on the seashore would be created.Secondly,there are understood fully by the investigation of all types of the afforested space in Jiaonan urban. The paper analyses the composition of green trees,then it advances four directions of the adjustment according to the local actuality and request of ornamental character on the basis of the given planning principles.Firstly,the proportion of everygreen trees in the road afforestation would be improved, the rate of green sight would be also increased.At the same time, the ratio of trees would be enlarged between trees and brushes. Secondly nonproductive green space should be considered the long-term green effect, increase the rate of slow-growth trees, enhance application of the local trees and improve theirs rate.Thirdly, the paper puts forward 8 types of fundamental trees and 23 types of backbone trees that fit for urban afforestation of Jiaonan City.Finally, in productive green space, the rate of everygreen trees is so little that theirs rate should be increased and the rate of deciduous trees should be reduced; the rate of trees is so little that theirs rate should be increased and the rate of bushes should be reduced; the rate of quick-growth trees is so high that theirs rate should be reduced and the rate of slow-growth trees should be increased.Thirdly, the paper comes to these suggestions through the analysis of ornamental character. There are about 7 types of flowering trees in summer and in autumn, of which theirs flower period may last for a long time such as Rose chinensis. Lagerstroemia indica,Punica granatum,Abelia chinensis,Spiraea salicifolia and so on. If they pair up with other ornamental trees, here and there are flowers not only in spring but also in summer and in autume. There are Chimonanthus praecox,Camellia oleifera,Camellia japonica.ect,which flower in winter. If more and more herbaceous flowers would be introduced and types of leafseeing trees and fruitseeing trees would be increased, the effect that there are many flowers in winter is realized completelyFourthly,the paper puts forward to planning suggestion according to investigation about trees in the nursery in the planning district of Jiaonan.There are 45 species 23 groups 13 families in theirs nursery, of which the ratio of the colour-leaf trees compared to the total trees is 1:8. The current afforestion projects need much more large standard of nursery trees and colour-leaf trees such as Platanus acerifolia,Liriodendron chinense,Magnolia grandiflora,Celtis sinensis,Fraxinus chinensis,Acer palmatum,Photinia serrulata, and so on. Because the type planning of garden trees lags behind, it leads to these types that produce on a small scale. Therefore, on the one hand the nurseries adjust the structure of the type of trees and enhance the colour-leaf trees introducing and cultivating,on the other hand they pay attention to increase producing big-scale trees.So long as had these trees in the nursery, they could be sale out, the afforested types of trees in the city could be guaranteed, urban afforestation could have staying power.In a word, based on the investigation and analysis of the present type of trees,on the study of the planning trees and landcape distribution, the paper comes to the planning suggestion of afforested trees in order to provide scientific basis for the urban afforested construction of Jiaonan. The final aim is that build the multi-level. multi-structure. multi-function plant community of urban green space system step by step...