Study On The Layout Of Green Space In Qingjian City Based On Ecological Security

Ecological security aims at maintaining the integrity,stability and biodiversity of the ecosystem and seeking the sustainable development of the city.The ecological security pattern mainly deals with the contradiction between the ecosystem and the urban social and economic system,and seeks the balanced development between the two,which is the key link and effective way to guarantee the bottom line of regional ecological security and the high-quality development of the city.The Loess Plateau is one of the important ecological system protection and restoration projects in China.The region is characterized by ravines crisscross and terrain fragmentation,and is faced with ecological problems such as ecosystem degradation and serious soil erosion.Qingjian is located in the loess hilly region of northern Shaanxi,which is affected by gully topography and landform,loess loose soil quality and different seasonal precipitation.The city is faced with serious soil erosion,weak water conservation ability,landslides and debris flow geological disasters and other prominent ecological security and environmental problems.Meanwhile,it is constrained by topography and landform.As a result,urban land resources are in short supply,and there are unreasonable layout problems such as the number and index of urban park green space.On the one hand,urban green space has ecological functions such as water conservation,enhancement of environmental selfregulation,maintenance of ecosystem stability,and so on.At the same time,it can also provide residents with multi-level and diversified park green space for recreation.As an important position to satisfy people’s yearning for a better life,a good green space layout can effectively exert the dual purposes of green space ecological constraint and service supply.Based on the existing theoretical research,this paper analyzes the ecological background conditions of Qingjian city,clarifies the ecological environmental problems that Qingjian faces and the particula sources of its interference with urban ecological security,constructs the ecological security pattern,and establishes the green land structure and the green land layout to maintain the ecological security pattern.From the perspective of urban ecological security,this paper provides scientific suggestions for the urban space development and green space layout of Qingjian,and conducts research from the following aspects.First,carry out preliminary basic research on Qingjian City from both theoretical and practical aspects.The background,significance and purpose of the research are summarized,and the research status is summarized based on ecological security and urban green space layout,so as to master the construction technology and method of ecological security pattern and the research trend of urban green space layout,as an important basis for the establishment of research ideas and methods.On the basis of theoretical research,the ecological background conditions of Qingjian are found out,and the current layout of Qingjian green space is analyzed emphatically.From the perspective of ecological security,there are three problems in the current layout of Qingjian green space.First,as a green space with ecological conservation and stability maintenance,it lacks the binding force.Second,the protection of green space safety isolation is not enough;Third,the imbalance in the supply of park green space for urban residents’ recreation.Second,the ecological security pattern is constructed according to the ecological security problems in the research area.On the basis of constructing the sensitivity of soil erosion assessment and the importance of water conservation evaluation,comprehensive geological disastrous places will get Qingjian as an important ecological source.Extract qingjian ecological corridor,explicitly and implicitly based on the minimum cumulative resistance surface.The ecological security pattern of Qingjian River was constructed on the basis of ecological source area,ecological security level patches and corridors.Thirdly,starting with the ecological process and security pattern,we should guide the green space structure rooted in the ecological security pattern.Based on the ecological security pattern,the urban construction base is evaluated,and the security conflict patches of construction land and the potential space of green space with different functions are identified.On the basis of the establishment of the structural elements and patterns of Qingjian green space,the "multi-spot Mosaic,ecology first","park ornament,recreation supply" and "corridor link" are adopted.The planning strategy of "weaving threads into nets","elements integration,multi-dimensional",forms a three-dimensional green space structure.Fourth,take ecological security pattern and green space structure as the framework to guide the urban green space land layout in Qingjian.The planning path from the outside to the inside is "ecological conservation and stability maintenance of green space-protection and safety isolation of green space-recreation supply of park green space".Firstly,the layout of important ecological conservation and stability maintenance of green space in the city is carried out to ensure the stability and integrity of the regional ecosystem and to construct the basic ecological security barrier of the city.Secondly,the important geological disaster points,river systems and urban roads and other Spaces of the protection of green space layout,further ensure the ecological security of the city;Finally,according to the residents’ needs,the park green space layout model is constructed to carry out fixed point and quantitative layout of urban district-type comprehensive(mountain)park and internal point park green space.