The Green Space Network Construction Of Wenjiang District Of Chengdu Based On Landscape Spatial Pattern

In recent years, with the continuous deepening and practice of urban and rural, the contact between urban and rural has become much closer,however, the urban green space which is often limited by the urban development, so it has become the focus of current research that to build a regional green space network system.The green network theory has been becoming the interdisciplinary research frontier of landscape ecology, urban ecology, urban and rural planning and learning, urban planning in recent years.Green network of administrative region of a city is one of the a branch development direction of the urban green network, and it is an important link to protect and build the blameless regional ecological environment resources and focus to play the ecological benefits of green spaces, to speed up regional development.First of all,the article study the green network-related concepts and theories, described the relationship between landscape pattern and green space network. It Reviewed the research and development of green networks, introduces the domestic and foreign outstanding green space network planning practices and comparative analysis, summed up its reference, and listed Beijing, Nanjing, Xiamen Island, Jinan and so on which landscape ecology and analysed of landscape pattern were used to build green network building practice for example. It summarized the methods and techniques of the green network planning, introduced in detail the landscape pattern and the green network index that used in this study, then,put forward the study route of this article.Under the support of GIS, on the theoretical basis of landscape ecology and green network,the article explored the construction of green network that combined with wenjiang district in administrative region of a city green network system. In analysis of landscape pattern, it selected seven seven plaques type level index as CA,NP,PD,LPI,ENN_MN,PLADJ,COHESION to analysis the district of existing and planning green areas. To a certain extent, it illustrates that the green space system planning in2010integrates the existing fragmented green patch, fragmentation of green parks patches have reduced, and connectivity have changed. There have little difference between A variety of production green space index, it can be make out from the change of PLADJ and COHESION that the planning interatied the existing decentralized production green spaces. The protective green spaces rely heavily on the planning of roads (railways), the ENN_MN can be seen that planning protection green spaces distribution were more dispersed and mutual adjacency between the various patch were reduced. From the point that patch density of view, the planning integrated and concentrated the original attached green spaces, the increase of the largest patch index also shows that the increase in the area of the dominant plaque; The NP of the Park green spaces were the most, which achieved70, coupled with the density of plaques was much bigger, to some extent,it also showed that Park green spaces on a not fragmentation level.followed by the attached green spaces, about36, the planning made a certain degree of integration, the degree of fragmentation has changed. The protective green’s NP is at least, and it had a low degree of fragmentation, but it was more dispersed, and its connectivity was not high; from each patch type LPI index point of view, it was higher in advantage of the protection of green spaces and production green spaces, but green parks and attached green spaces were on the contrary, their individual patch size was relatively small, more in plaque number, resulting in a smaller scale of the LPI, were7.87and21.97;In those several types of plaques, protective green spaces had largest ENN_MN index1046.30, mainly because of that under the guidance relevant policies of road, railway construction, and affected from the urban land use planning, its had more arbitrary in spatial distribution;PLADJ and COHESION were much higher in all kinds of planning green index, similar to the adjacent percentages and spot block plaque combination of degrees higher, it indicated that there were higher centralized in spatial distribution of the various patch in landscape space planning,and were higher in its landscape space connectivityBased on the landscape pattern characteristics that previously obtained in the study area green patch,1analysed the network nodes and green corridors in the planning,and filter out82landscape nodes for the construction of the green space network. I used three indicators which was corridor number, corridor length and corridor density to analysis th corridors structural of five built green network, it reach a conclusion that3,4,5,6were optimum corridor type; Usually, four indices of closure line point rate, connectivity, cost were used for network structure analysing. It come to result that the network4,5,6had the higher index in alpha, beta, gamma, while the cost is relatively low, therefore, through the comparison of the network structure index,we can think that network4,5,6were the optimization program of Wenjiang built green network.Network5based on4,combined Wenjiang urban development, followed the principle of sustainable development and phased implementation,took of some important node and key corridor as a key building objects for pre-construction, and secondary node corridor as a late perfect complement. Finally,it made out the conclusion that network6was optimization planning of WenJiang green space network.