| Under the background of ecological civilization construction,the development of national territory spatial is becoming a hot spot in the application of human geography and urban-rural planning.The evaluation of ecological carrying capacity determines the rationality and accuracy of national territorial space development,which is one of the basic tasks for making this type planning.The Qinba Mountain in Sichuan Province is not only one of the continuous poverty belts in China,but also an important biodiversity protection area and water conservation function area.Its industrial foundation is so weak that economic development is lagging behind,and urban-rural dualization is obvious.So it is urgent to find a way of development based on ecological protection.While actively advancing national territorial space planning,it is of great significance for optimizing the allocation of national territory resources and promoting the planning of national territory development by discussing the strategy of national territory development is based on the evaluation of ecological carrying capacity.In this paper,the Qinba Mountain Area in Sichuan Province was selected as the study area.According to the defining characteristics of ecological carrying capacity,the natural ecological environment and socioeconomic characteristics of this area was considered.Furthermore,14 indicators,including slope,annual average precipitation,annual average temperature,vegetation coverage index,biological abundance index,population density,etc.,were selected to build an ecological carrying capacity evaluation index system for the study area from four aspects-topography,climate and hydrology,ecological environment and socio-economy.By using analytic hierarchy process,comprehensive evaluation methods,etc.the overlay analysis function of GIS was used to calculate the ecological carrying capacity of Qinba Mountain Area.The evaluation results are divided into five grades according to the natural breaks method,it includes of poor bearing capacity,worse bearing capacity,medium bearing capacity,good bearing capacity and excellent bearing capacity.According to the results of ecological carrying capacity zoning,the corresponding countermeasures of national territory spatial development were put forward from the population control of patch unit and district and county unit respectively.Finally,according to the relationship between the ecological carrying capacity and the population of each district and county,the Qinba mountain area of Sichuan province is divided into three zones:priority lifting zone,optimization guiding zone and protection control zone.The research results showed that the ecological carrying capacity in the east of Qinba mountainous area in Sichuan was the highest,the ecological carrying capacity in the south was lower,while the ecological carrying capacity in the west was the worst.The ecological carrying capacity level that in the medium-good region with an area of 27876km~2,and it was accounted for 58%of the total area,which was distributed in most areas of the central part of the research area.In the future development of national territory space,it is suggested to optimize the land development layout,strengthen the ecological conservation and improve the flexibility of the ecological system;The area with excellent bearing capacity was7170km~2,and it was accounted for only 15%of the total area,which was mainly distributed in the place of Wanyuan City,Xuanhan County,Nanjiang County,etc.In the future development of national territory space,which is suggested that the area should highlight its ecological value,optimize the balance relationship between supply and demand in this area,and improve the ecological livability;The area with poor ecological carrying capacity was 12738km~2,and it was accounted for 27%of the total area in the region,which was mainly distributed in the place of Pingwu County,Beichuan County,Qingchuan County,Chaotian district etc.In the future development of national territory space,which is suggested that the area should optimize the ecological environment,guide the development and promote the industrial cluster by combining with the regional characteristics,so that it could form a high-quality,high-efficiency and high-quality resource development mode.Judging from the ecological carrying capacity situation of each district and county that in Qinba mountain area of Sichuan Province,the ecological carrying capacity of Pingwu County was the lowest,and the ecological carrying capacity value of which was 0.49.In the development of national territory space,which is suggested that the area should strengthen the water conservation function,improve ecosystem flexibility,guide the development of characteristic industries,and promote the economy and population gathering in the appropriate development zone;the ecological carrying capacity of Wanyuan city was the highest,and the ecological carrying capacity value of which was 0.62.As an important ecological conservation functional area in this region,in the future development of national territory space,which is suggested that it should focus on the protection of the area and highlight its ecological use value.Judging from the results of the national territory development zoning,the Cangxi County,Bazhou District,Pingchang county and Yilong County were the priority upgrading areas,it is suggested to control population growth,relieve regional pressure,give priority to development and promote industrial clusters.While the Wanyuan City,Nanjiang County,Zhaohua district and Wangcang County were the protection control areas,it is suggested to focus on protection,strengthen water conservation,develop ecological industry and highlight its ecological value.And the remaining districts and counties were the optimization guidance areas,it is suggested to optimize the population size,optimize the balance of supply and demand,guide the large-scale development of economy and improve the effective supply. |
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