Research On Ecological Restoration Zoning And Key Regi On Identification In Territorial Space

Under the era proposition of implementing the construction of ecological civilization and further promoting the territorial space planning,the production mode of fishing with all one’s might and killing the chickens to catch the eggs in the past is incompatible with the current sustainable development strategy.As an important part of the territorial space planning,the ecological restoration of territorial space is of great significance to protect and improve the function of the ecosystem,create a beautiful living environment,assist in the optimization of the spatial pattern,change the way of production and life,and more conducive to promoting the construction of a modern power with harmonious coexistence between human and nature.The ecological restoration zoning and the identification of key ecological restoration areas,as an important starting point for the ecological restoration of land space,make the ecological restoration of land space more operational.This thesis takes the middle and lower reaches of the Yellow River as the research area,starting with the analysis of key ecological issues;Then divide the ecological restoration zones and put forward zoning control measures;Finally,identify the key areas of ecological restoration and propose targeted ecological restoration strategies.The purpose is to explore and build a set of land space ecological restoration system,with a view to providing reference for the land space ecological restoration work.The results show that:(1)Analyze ecological problems based on land use transfer and landscape pattern change in the middle and lower reaches of the Yellow River from 2010 to 2020.On the one hand,the disorderly expansion of construction land and the compression of ecological space are serious.The net increase of construction land in the past ten years was 2224.95 km~2,most of which were converted from farmland,forest and grassland.On the other hand,the ecological landscape tends to be broken,and the connectivity between ecosystems decreases.Specifically,the patch density(PD),maximum patch index(LPI)and aggregation index(AI)of ecological patches such as farmland,forest and grass decreased by different degrees,and the relevant indicators of construction land and unused land increased.(2)Based on the"leading ecological function-ecological vulnerability assessment",the ecological restoration zones are divided.Among them,based on water conservation,water and soil conservation,biodiversity,and windbreak and sand fixation,eight first-level ecological restoration zones are divided:water and soil conservation zone,water and soil conservation zone,biodiversity zone,windbreak and sand fixation zone,water and soil conservation and water conservation zone,water and soil conservation and biodiversity zone,water and soil conservation and windbreak and sand fixation zone,biodiversity and water conservation zone.The middle and lower reaches of the Yellow River are dominated by water and soil conservation areas,with an area of 125395.54km~2,accounting for 39.89%.Establish an ecological vulnerability assessment index system from six levels of terrain,soil,climate,hydrology,vegetation and human activities,and delimit the secondary ecological restoration zone.There are three secondary ecological restoration zones:ecological conservation zone,general restoration zone and key restoration zone.Overlay two levels of zones to delimit 19final ecological restoration zones,mainly the general restoration area of water and soil conservation,with an area of 72518.33km~2,accounting for 23.07%of the total area of the study area.For the purpose of improving the regional ecological service function and improving the regional ecological quality,according to the single factor evaluation results of ecological leading function and ecological vulnerability,the regional management and control strategies were proposed for 19 ecological restoration areas.(3)Based on the basic paradigm of"ecological source-resistance surface-ecological corridor-ecological node-ecological barrier point",the ecological security pattern is constructed to identify the key areas for ecological restoration.A total of 15 ecological sources were identified,covering an area of 54233.11 km~2,22 ecological corridors with a total length of 2618.64 km,93 ecological nodes and 26 ecological obstacles,covering a total area of 617km~2.In combination with the ecological vulnerability assessment,31 key ecological restoration areas were identified,with a total area of 307km~2.Among them,there are 23primary key areas with an area of 228 km~2,and 8 secondary key areas with an area of 79 km~2.According to the current situation of land use and ecological problems in key areas,the ecological restoration strategies in three directions of shaping ecological landscape,dredging ecological corridors and optimizing agricultural production are proposed.