Discuss The Reasonable Construction Of Urban Ecological Garden In Northwest China

In northwest China,natural conditions are bad,vegetation coverage is low,landscape effects are unsatisfactory,and floods occur frequently in rainy season,the construction of garden ecosystem is in urgent need of perfection.To solve the above problems,this paper,taking Dingxi city urban area as an example,collecting relevant background information in the study area,using geographical analysis software ArcGIS10.2,landscape analysis software Fragstats4.2.1 and SWMM sponge urban infrastructure simulation software,using GIS analysis,landscape index,quantitative analysis and the quantitative analysis of SWMM model analysis and research of the construction of landscape ecological system,for arid and reasonable construction of landscape ecosystem in arid areas.Based on the above analysis methods,the main conclusions are as follows:(1)Dingxi needs to improve the patch corridor Ecological Garden NetworkThrough GIS analysis and landscape index quantitative analysis,combined with the current situation of green space function in Dingxi City,this paper evaluates the current situation of Dingxi garden.The total area of green space in Dingxi City is about 5.39 km2,the green space rate is 15.08%,the fragmentation of green space patches is high,the types are relatively lacking,and the distribution is uneven,the fragmentation of residential green space,traffic green space and public construction green space is relatively high.The aggregation effect of green space in Dingxi City is not obvious,and the isolation degree of residential green space and traffic green space is high,which is not conducive to the local green space ecological environment effect.Dingxi's main green space is concentrated in the middle of the city.The service scope of the 500 m buffer zone of public green space can cover 28% of the urban area.The 1000 m buffer zone can cover 39.2% of the urban area,which has not met the actual needs of most residents.Dingxi corridor construction is deficient.Therefore,Dingxi City Ecological Garden network system needs to be further improved.(2)Dingxi needs to use LID measures to strengthen the utilization of water resourcesIn this study,aiming at the situation of drought and water shortage in Dingxi City,the SWMM model is used to simulate the runoff control effect of LID measures under a variety of rainstorm conditions in a certain area of Dingxi City,and analyze its effectiveness in reducing runoff.The results show that with the increase of surface runoff,the decrease of LID measures to surface runoff shows an upward trend.The reduction degree of runoff coefficient of LID measures in public construction green space and residential green space is better than that of public green space.Therefore,the use of LID measures can effectively reduce runoff,and should be combined with the current situation of topography and other reasonable layout.Based on the above data analysis results,the following ecological landscape construction measures are proposed in this study:(1)Building Dingxi patch corridor Ecological Garden NetworkIt is necessary to connect and layout all kinds of green space in Dingxi City,supplement the construction of special park,residential green space,public construction green space,waterfront and traffic green space in corridor,form the ecological garden network system of patch corridor combination,and build the foundation of Dingxi ecological garden;(2)Effective utilization of water resources in Dingxi by LID measuresAccording to the local arid and semi-arid climate conditions,also different locations,select the LID facilities that are in line with the local reality,and make a reasonable layout of the catchment area and existing green space planning based on the comprehensive terrain and river factors,so as to reduce the loss of surface runoff and effectively collect and use water resources;(3)Reasonable selection and allocation of garden plants in DingxiIn view of the lack of plant species,the low utilization rate and unreasonable allocation of native and drought resistant plants in Dingxi City,with reference to the plant planting principle,supplement and apply native plants,properly introduce drought resistant and drought resistant plants,reasonably combine and allocate different types of green space,restore local ecology,and improve the urban landscape viewing effect.Through the above measures,we can basically build the garden ecosystem of Dingxi City,lay the foundation for the construction of an ecological livable city,improve the quality of residents' living environment,improve the urban function and landscape,protect and restore the fragile urban ecological space,create a green living barrier for Dingxi City,and provide reference for the construction of ecological garden in Northwest China.