| The urban green space system improves the air quality,reduces heating island effect, purifies and preserves water reservoirs;hence it is vital for development of suitable ecological environment.The urban green space system is the key of planning on constructing the ecological city.The current status and landscape pattern of city's green space system were analyzed in order to provide the scientific basis on optimization pattern and the ecology plan of the city green space system.In this paper,CAD,Photoshop and other image-processing techniques extract 2001,2008 District of urban green space image data of Chongqing New North Zone.For the study of the green space system of New North Zone,application of landscape ecology theory and methods on changes in green space landscape pattern analysis;and for New North Zone of the landscape pattern of green space system problems in 2008,system of green space landscape pattern optimization.(1) In accordance with the general principles of landscape ecology to classify the type of green landscape,urban green space is divided into public park,green buffer,attached green space,woodland,etc.4.Differences in the type area of the green,and the largest area is woodland which is accounting more than 35%for the total green space.(2) Application of landscape ecology in the analysis,the use of the landscape diversity index,landscape evenness index,landscape dominance index,landscape corridor density, landscape fragmentation index on the model of New North Zone of green landscape pattern analysis and evaluation of changes.2001-2008,the total area of green space increased from 1955.34hm~2 to 3986.64hm~2, number of patches increased from 392 to 301,green coverage rate improved from 15.12%to 30.83%. According to the change of landscape index,the landscape diversity index,evenness and contagion were increasing,while the dominance was decreasing.This phenomenon demonstrates the distribution of green space is equal,the proportion of each type of green space is in the trends of harmonious and the distribution of pitches is dispersive.Due to New North Zone of the construction in a city focused on the protection of green space,the fragmentation degree was increasing,fractal dimension was decreasing,the shapes of pitches was tefiding to simplify which lack of natural shapes,the landscape cohesion and line corridor density were increasing,it shows the potential of connectedness between different green landscapes was increasing.The landscape pattern analysis of urban green space showed that:New North Zone in 2008 various types of green space component of the green patch is more reasonable,small plaque(≤1hm~2) accounted for 37.30%the total number of plaques,small plaque medium(1-5hm~2) and medium-sized plaque block(5-10hm~2) accounted for 44.50%the total number of plaques,large and medium-sized plaques(10-20hm~2) and large patches(≥20hm~2) accounted for 18.16%the total number of plaques.The fractal dimension of green patch is low,the patch border is comparison rule,and the shape is relatively simple.(3) The analysis of landscape pattern on the green space system planning and research in 2008 about New North Zone,found that the landscape space layout in the green space of the New North Zone of the following questions:the small size and a small number of urban green space;Unequal distribution of public park;In urban construction too much emphasizing on the function of the road and the neglecting of the function of green belts;Lacking of green buffer, between rivers,industrial areas and residential areas,around industrial areas,yet has not been built adequate protection green belt;woodland canopy density is low,there is no connection into a film,it can not achieve the improvement of the urban ecological environment;Lacking of uniform spatial distribution,the overall layout of sporadic,do not constitute point,line,surface, body of the green space system.The unique shape of the land of New North Zone,made the layout of urban green space system model——"green rings + green nuclease+ green galleries + green wedges".And structural planning,summarized as "one ring——two wedges——four belts——seven nuclease". In accordance with the different characteristics of green patches and corridors,planning the green patches and corridors respectively to improve urban green space landscape pattern optimization system operational.Through the optimization of urban green space landscape pattern,the quality of urban green space can be improved.Green area has increased,the degree of fragmentation of green patches has reduced,Landscape connectivity index has increased.The urban green space system is able to maintain the sustainability of the entire city,but also to maintain the stability.
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