| Under the background of urbanization process,the growth rate of urban construction land is accelerating,and the irrational use of land resources has caused ecological problems such as soil erosion to different degrees and the sudden reduction of biodiversity,which makes the ecological environment in some areas gradually fragile.Therefore,the protection and construction of ecological environment is urgent.Rational zoning of regional ecological functions is conducive to protecting the ecosystem of the study area,coordinating the relationship between land use and ecological environment,promoting the sustainable utilization of natural resources and the common development of regional society and economy.In recent years,in order to speed up economic construction,Suzhou District has improved the urban development,so there is the problem of artificial excessive reclamation,which leads to soil secondary salinization,soil desertification,desertification and other land degradation,fragile ecological environment and prominent spatial differentiation.In view of this,this paper takes Suzhou District as the research object,combines the current situation of ecological environment,mainly uses GIS spatial analysis method to evaluate the sensitivity of land ecological environment and the importance of ecosystem service function in Suzhou District,makes overlay analysis on the evaluation results,and divides the ecological function of Suzhou District on the basis of comprehensive evaluation.The ecological and environmental protection measures and suggestions are put forward for each functional area,which can be used as the basis for ecological and environmental protection,sustainable utilization of natural resources,optimization of land production layout and sustainable development of social economy,and can also provide reference for the government and relevant departments to formulate protection and management measures.The main research conclusions are as follows:(1)The evaluation results of land eco-environmental sensitivity showed that the eco-environmental sensitivity of Suzhou District was mainly light sensitive,with the total area of 222711.11hm~2,accounting for 63.89%of the total area of regional space,mostly concentrated in the gentle terrain area.The total area of the insensitive area is4963.66hm~2,accounting for 1.34%of the total area,which is mainly distributed in a small part of the northeast area of Sandun Town,Yinda Town and Qingshui Town.The total area of the moderately sensitive area is 106,383.68 hm~2,accounting for34.35%of the total area,which is mainly distributed in the water concentration area of Yinda Town,Sandun Town,Xidong Town,Quanhu Town and Huajian Town in the north.The total area of the severely sensitive areas is 835.98hm~2,accounting for0.42%of the total area,which is mainly distributed in the southwest and southeast border area near the Qilian Mountains.(2)The evaluation results of ecosystem service importance showed that the importance level of comprehensive ecosystem service function in Suzhou was highly important,with a total area of 134,963 hm~2,accounting for 40.25%of the regional spatial area.It was mainly distributed in Jinfosi Town,Qingshui Town and Xiaheqing Town in the southeast,mainly with woodland and grassland.The medium important area was the second,with an area of 84890.693hm~2,accounting for 25.31%of the regional spatial area,mainly distributed in the southeast of the region,mainly cultivated land and grassland in the northern plain of the lower Qilian Mountains.The general important area covers 65714.993hm~2,accounting for 19.60%of the regional spatial area,most of which are distributed along the moderately important belt in the north,mainly in the north of Yinda Town and the east of Sandun Town,and a few scattered in Dongdong Town,mainly in sandy land and bare land.The extremely important area is the smallest,49776.234hm~2,accounting for 14.84%of the regional space area.This part of the area is mainly composed of water,woodland,wetland,and distributed along the river water area in strips.(3)The ecological function zoning of Suzhou District is divided into ecological conservation area,ecological control area,ecological promotion area and ecological protection area.The results showed that the ecological conservation areas were mainly concentrated in the central construction area in the north of Suzhou District,and also in the southeast of Jinfosi Town and Qingshui Town.In this area,agricultural production and construction activities can be carried out moderately.On the premise of insisting on saving and intensive land use,soil should be improved and high-standard farmland construction should be intensified.Ecological control areas are mainly distributed on both sides of the main rivers in Suzhou District,and a small number of ecological control areas are also distributed along the source of the river system in the southeastern mountain plain.The area should focus on the cultivation of ecosystem services and increase the intensity of ecological restoration projects.The ecological enhancement area is mainly distributed in the area around the ecological protection area in Jinfosi Town,Xiaheqing Town and Qingshui Town in the southeast and Yinda Town and Sandun Town in the north.The ecological agriculture construction activities of a certain scale should be developed appropriately in this area,and the ecological protection construction and restoration projects should be carried out,and the restoration of natural vegetation should be strengthened to improve the coverage rate of vegetation.The ecological protection areas are mainly distributed in the areas of river water source,woodland and wetland in Suzhou District.All human activities unrelated to ecological protection and improving the quality of ecosystem services should be banned,wetland restoration projects and shelter forest construction projects should be intensified,biodiversity and water conservation capacity should be improved according to local conditions,and the supply of ecosystem services should be increased. |
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