| With the rapid development of the global economy,the negative impact of human activiti es on the natural ecosystem is increasing,mainly manifested in the destruction of the structure and function of the natural ecosystem,the weakening of the ability of the ecosystem to provi de ecological services,and even serious ecological degradation in some countries and regions.In view of a series of ecological and environmental problems,the Chinese government has pr oposed the integrated protection and restoration of "landscape,forest,field,lake,grass,sand a nd ice" for the ecosystem.With the development of territorial spatial planning at all levels,ter ritorial spatial ecological protection and restoration has gradually become an important resear ch content in the field of planning in China.At present,there are few studies on territorial spat ial ecological protection and restoration from the perspective of overall ecosystem protection and system restoration,and the research contents and methods need to be further enriched and improved.Taihe County is located in the connecting zone of Poyang Lake Ecological Econo mic Zone and southern Jiangxi Soviet area.It belongs to the core city of Jitai urban agglomera tion.At the same time,Taihe County is also designated as a national key prevention and contr ol area of soil and water loss.The contradiction between County Ecological Protection and ec onomic development is becoming increasingly prominent.Therefore,taking Taihe County as t he research area,based on the perspective of overall ecosystem protection and system restorat ion,this thesis puts forward targeted territorial spatial ecological protection and restoration str ategies through the construction of ecological network,which can not only improve the curren t theoretical research framework of territorial spatial ecological protection and restoration,but also provide new ideas and methods for the formulation of ecological protection and restorati on schemes in the preparation of county-level territorial spatial planning.Based on the land use data in 2010,2015 and 2020,this thesis first analyzes the temporal and spatial changes of land use and landscape pattern in Taihe County by constructing the lan d use transfer matrix and calculating the landscape pattern index,and diagnoses the problems existing in land use and patch landscape structure in Taihe County.Then,three key ecosystem service functions in the region of habitat quality,soil conservation and water conservation are selected to characterize the ecosystem function of Taihe County.The temporal and spatial cha nges of these three ecosystem service functions are analyzed through the invest model and wa ter balance method,and the problems existing in the ecosystem function of Taihe County are diagnosed.Taking the problem as the starting point,with the help of morphological spatial pat tern analysis,landscape connectivity analysis,minimum cumulative resistance model and circ uit theory,the ecological sources,ecological corridors and ecological nodes with important ec ological functions and patch connectivity are identified,and the construction of ecological net work is completed.Finally,based on the constructed ecological network,the strategy of ecolo gical protection and restoration of county territorial spatial is put forward.The main conclusio ns of this thesis are as follows:（1）From 2010 to 2020,with the acceleration of industrialization and urbanization,the la nd use structure of Taihe County has undergone obvious changes,among which the area of co nstruction land has changed most significantly,with an area increase of 8.39% in the past ten years,while the area of ecological land such as forest land,grassland and water area has conti nued to decrease.The conversion of cultivated land,forest land and water area to construction land is the main form of land use change in Taihe County.The increase of construction land i s mainly due to the expansion of cities and towns to the periphery and the continuous erosion of surrounding farmland and forests,resulting in the gradual shrinkage of habitat.According t o the analysis results of landscape pattern index,the landscape patches in Taihe County tend t o be fragmented,and the connectivity between ecological patches decreases.（2）From 2010 to 2020,the key ecosystem service functions in the three areas of habitat quality,water conservation and soil conservation in Taihe County showed a downward trend,and the scope of low-level ecosystem service functions tended to expand.In the past decade,t he comprehensive ecosystem service function of Taihe County showed a downward trend,and the decline rate was accelerated.The self-healing ability of ecological patches in the region d ecreased,and biological survival was facing challenges.（3）Using morphological spatial pattern method,landscape connectivity analysis,minimu m cumulative resistance model,gravity model,circuit theory and hydrological analysis,a tota l of 10 ecological sources,25 potential ecological corridors,10 key ecological corridors,128 ecological radiation corridors,10 ecological pinch points,57 ecological barrier areas and 16 e cological fracture points in Taihe County were identified,and the construction of ecological n etwork in Taihe County was completed,The constructed ecological network has both the imp ortance of ecological function and landscape connectivity.（4）Based on the constructed ecological network,combined with the spatial location of e ach component element of the ecological network and its current land use,this thesis puts for ward targeted territorial spatial ecological protection and restoration strategies,including ecol ogical source protection and restoration strategy,ecological corridor protection and restoration strategy and ecological node protection and restoration strategy.The research results can prov ide reference for the formulation of ecological protection and restoration scheme in territorial spatial planning. |
PDF Full Text Request