Spatial Zoning And Effect Analysis For Land Use Spatial Conflict In Pearl River Delta Urban Agglomeration

Urban agglomeration has increasingly become an important growth pole of China’s national economy,and will become the"main form"of China’s future urbanization and the main platform for China participating in international economic cooperation and competition.Along with the rapid economic and social development,the population and productivity factors spatially agglomerate in urban agglomeration.The urbanization process represented by land use change has reshaped the function and structure of the regional ecosystem in urban agglomeration,and has brought different changes in spatial conflicts and ecosystem services in different regions within urban agglomerations.Urban agglomerations are facing severe ecological environment and resource problems,it’s specific performance is the dramatic land use space conflict and the sharp decline in the benefits of ecosystem services.These problems have seriously hindered the healthy and sustainable development of the urban agglomeration’s social-economic-ecosystem complex system.Under the background of China’s new urbanization and ecological civilization construction and the development of national space planning.Taking the Pearl River Delta Urban Agglomeration（PRD）as research area,this paper chose 5 geospatial data include Nighttime Light Intensity,Land Surface Temperature,Landscape Disturbance,Traffic Network Density and Gross Primary Productivity from 3 dimensions of human activity intensity,natural environment background and human-land interaction effect of urban agglomeration,and calculated the urban spatial attribute index（USAI）of PRD by Multiple Logistic Regression.USAI was used to spatially divide urban agglomerations,and delineate the core,fringe and rural areas of the PRD.The result of delineation showed that the core,fringe and rural areas with area and its percentage of10733.81 Km²（19.41%）,7864.89 Km²（14.22%）and 36697.96 Km²（66.37%）respectively.On the basis of space division,this paper referred special conflict and landscape ecology theory,combined with ecological risk assessment model,adjusted existing spatial conflict model,and measured Land Use Special Conflict（LUSC）in PRD from1980 to 2016.The spatial distribution and change reasons of LUSC in PRD long time series were discussed,and its spatial autocorrelation and spatial heterogeneity characteristics were analyzed.Considering the ecological environment background of PRD,this paper estimates the benefits of raw material production（RMP）,nutrient material absorption（NMA）,gas regulation（GR）,soil conservation（SC）,environment purification（EP）and water conservation（WN&WS）of 6 ecosystem services.Combined with the analysis results of LUSC,this paper discusses the ecosystem service response under the difference of LUSC in different spatial divisions of urban agglomeration.Research indicates:（1）The intensity of LUSC in PRD presented a circle structure of“high-medium-low”from the core area to rural areas.The LUSC changes in urban agglomerations has different characteristics during different stages of urbanization.In the early stage of urbanization,LUSCs increase with the increase of construction land.With the spread of urbanization in urban agglomeration,construction land gradually“swallowed up”the surrounding agricultural and ecological land patterns,resulting in a decrease in the special complexity of land use,an increase in the special stability of land use,and a negative correlation between the increase in construction land and LUSC index(LU₄))changes.During 1980-2016,the LU₄)in the core and marginal areas of human activity concentration decreased by 0.100 and 0.025,respectively.Under the influence of small-scale expansion of urban space,the LU₄)value of rural suburbs,which are dominated by natural ecological space,increased slightly by 0.008.The LUSC Index spatial changes in urban agglomeration has a significant circle structure,and the trend from the core area to the rural area is declining.The spatial distribution of LU₄)showed significant spatial agglomeration and decreased with the passage of time and increase of threshold distance.In terms of spatial heterogeneity in PRD,the spatial variability of LU₄)caused by the random part of the strongest at the 20Km particle size,the weakest at the 40Km particle size,and the 60-100Km particle size decreases with the increase of the particle size.（2）NPP density increased due to favorable climatic conditions such as temperature rise and rainfall increase,Ecosystem Services Benefit（ESB）density and total ESB such as NMP,NMA,GR,SC and WN in PRD increased 2.19%、2.19%、2.19%、55.15%and 11.90%respectively,which counteracted the decrease of ESB caused by the sharp decline in agriculture and ecological land in the urbanization process.The expansion of urban construction process coupled with adverse external conditions such as rising evapotranspiration,has resulted in a reduction in the ESB of Dust-retention,SO₂Absorption and WS functions,which reduce in 6.73%,2.66%and 4.03%.（3）The large increase and decrease of LUSC caused by the urbanization process are serious disturbances to the ecosystem and have a negative effect on the ESB.When the LUSC is at a steady range of levels,favorable external conditions can promote the ecosystem to produce better service benefits.Even if external conditions deteriorate,the steady LUSC can reduce the negative effects on ecosystem function and ecological background,which can help maintaining regional ecological background and enhancing ecosystem flexibility.