Based On Landscape Unit Of Sichuan Deyang City Landscape Ecological Planning Of Urban Green Space System

As an important component of urban living environment, urban green space system not only produces the significant ecological value, but also provides recreation places, the landscape adjustment functions and economic production for urban area. Nowadays, the rapid development of urban expansion gives new challenges, which is how to construct, plan and establish urban green space system scientifically, achieving the harmony between human and natural environment and urban sustainable development. As an important subject, it offers the reason and method for urban planning and the theory development and the practice research of landscape construction. In these, the corridor, patch and matrix in landscape composed the landscape basic cell. It is a new method of urban green space landscape ecological plan based on the model composed by the up three which is compared with traditional green system plan method. Under the "patch-corridor-matrix model", this study took the Jing Yang Area in De Yang City, Sichuan as an example, researched based on landscape unit. The researcher do the landscape pattern analysis of green system, choose the landscape index to do analysis by qualitative and quantitative, compare the landscape unit transformation in different periods, to command landscape dynamic change in the green system of Jing Yang. By these above, the planning of the program would be more scientific, and construct the urban ecological network by landscape basis. In this research, there have two parts:theoretical sides and practical sides. The conclusion is here:The theory foundation research include the reason of landscape patching emerging, the construction of urban green corridor and ecological network, the form of landscape pattern and heterogeneity, the choice, calculation and analysis of landscape indexes, the function of landscape source and sink, the transformation of landscape pattern and the driving force. These bring a sufficient theoretical support for this study. Based on the condition and development of Jing Yang Area, the guiding ideology is established, which includes the construction of urban ecological node, the construction of urban green corridor connection, the combine of ecological patch and the various wedge of landscape factor. It brings circle-network-corridor and wedge-shape system and the model of coordinating urban and rural development of urban green system ecological planning. The plan holds6principles:ecology, aggregation, keeping the landscape diversity, landscape characters and urban features, accommodating local conditions, the recent and forward period. During the construction of basic theory, the landscape classification of urban green system, extracting the landscape unit, chose the landscape index to calculate and do the analysis of them, observing the spatial pattern of landscape and the regulation of landscape changing under spatial-time transformation and lastly constructing the landscape ecological security pattern and optimizing the structure are the content of this research.Practice research is based on the method of landscape ecological planning which is abided by landscape unit. Firstly, interpret the landscape patch, corridor and matrix factor by analyze the RS information. Secondly, conclude the qualitative and quantitative analysis result of Jing Yang’s landscape pattern by the calculation and analysis of landscape pattern index. Based on the characteristic of the existing landscape pattern and the regular and tendency of the dynamic changing of Jing Yang’s urban green space, the research should do the reasonable landscape ecological planning.The observation of Jing Yang’s green space landscape pattern showed that there stays a symbol "川" for the landscape pattern. The green space is still distributed for scattered. The representation of gradient by spatial condition and the tendency of landscape transformation by temporal moving are obviously seen. The fragmentation in urban center is so serious. The area, number, shape and pattern of green patches changed rapidly. The gradient of landscape has the character from suburban to urban center. The influence of human activities is so intense. And the changing of suburban green space is faster than the center. Based on the pattern of country around the urban center, the category of green space patch is monotonous than center, but the connectedness is better than the latter, the interference of social activity is not intense. But for the truth, the evenness of patch is not good. All in all, suburban needs the more compact connection with urban center. Abided by these result, the ecological security area can be build along the Dong Shan hills and the bank of Shi Tingjiang River. The urban buffer zone can be established by Cheng-Mian high-speed way, the rail of Bao-Cheng and the first circle route of De Yang. The urban green way can be build among the urban traffic network. The urban green belt can be set by Mian Yuan River. The important ecological green patch can be utilized as urban ecological node. As these methods of green network construction, the landscape pattern of urban green system can be set up scientifically, which manifest the pattern:circle, network, corridor and wedge-shape.The theoretic and practical research of landscape ecological planning of Jing Yang’s urban green system has a instructional significance. And also it is a practical supplication of the principle of landscape ecological planning in Sichuan’s medium-scale city. The important significant of the harmony development of one city between human and nature is more and more manifesting. People hope to propose the more suitable method for the future urban landscape construction.