| With the accelerating process of regional industrialization and urbanization,problems such as the shortage of land resources,the prominent contradiction between people and land,and the conflict between different spatial types have become increasingly prominent.Under the trend of continuous expansion of construction land,how to protect cultivated land security and ecological security according to the advantageous resources of each city,and coordinate the contradiction between economic and social development and ecological protection,It is not only the basis of scientific land and space planning,but also an important problem facing the high-quality and coordinated development of cities.Taking the urban agglomeration around Poyang Lake as the research area,from the perspective of landscape pattern,this paper selects three aspects of spatial complexity,vulnerability and stability to construct the production-living-ecological spatial conflict index model,evaluates the production-living-ecological spatial conflict of the urban agglomeration around Poyang Lake in 2000,2010 and 2020 from the grid scale and county scale,and classifies it according to the conflict value,Analyze the change characteristics of the conflict types in the grid and county space,use the geographic detector model to determine the main single and interactive influencing factors of the production-living-ecological spatial conflict,and finally overlay the spatial conflict evaluation results with the ecological function evaluation results for zoning regulation,It provides a scientific basis for the optimization of spatial pattern and sustainable and healthy development of urban agglomeration around Poyang Lake.The key issues to be solved are:How to connect the pduction-living-ecological Space and land types?What is the distribution law of spatial conflict?How to regulate the study area?The results are as follows:(1)From 2000 to 2020,the urban agglomeration around Poyang Lake was dominated by ecological production space,mainly distributed in the high-altitude areas in the West and East,followed by production ecological space,distributed in the middle of the study area,i.e.Poyang Lake plain area,and the ecological space was dominated by Poyang Lake and rivers and lakes,The living-production space is agglomerated and distributed in Nanchang and the centers of various cities and counties,showing an obvious expansion trend.From2000 to 2020,the production-ecological space will be reduced from 30139.56km~2to29250.15km~2;The area of ecological-production space is reduced from 51445.56 km~2to50740.37 km~2;The area of living-production space increased from 2047.26 km~2to 3931.97km~2;The ecological space area decreased from 8519.12 km~2 to 8182.90 km~2;The production-ecological space and ecological production space changed more violently from2010 to 2020,and the living-production space and ecological space changed more violently from 2000 to 2010.(2)From 2000 to 2020,the number of seriously out of control grade grids in the urban agglomeration around Poyang Lake increased from 658 to 742,and the number of stable and controllable grade grids increased from 408 to 410,showing an overall upward trend,accounting for an increase of 2.31%and 0.05%respectively;The basic controllable conflict level decreased from 1446 to 1425,and the basic out of control level decreased from 1431to 1366,showing a downward trend on the whole;From 2000 to 2020,the average annual growth rate of the severely out of control type was the fastest,followed by the basic out of control type;In terms of spatial differentiation characteristics,the production-ecological space is mainly dominated by basically out of control conflict,accounting for 42.99%in2000 to 42.05%in 2020.The ecological production space is dominated by the level of basically controllable conflict,rising from 49.52%in 2000 to 50.84%in 2020.The living-production space is dominated by the level of serious out of control conflict,increasing from40.29%in 2000 to 56.03%in 2020.The ecological space is dominated by stable and basically controllable conflict levels,showing a downward trend,and the level of serious out of control conflict accounts for the least.From 2000 to 2020,the level of county conflict in the urban agglomeration around Poyang Lake changed from basically controllable to basically out of control.The proportion of basically controllable decreased from 40.35%to 24.56%,and the proportion of basically out of control increased from 26.32%to 36.84%;From 2000 to 2020,the basic controllable level changed from mainly distributed in the middle and east of the study area to only small clusters in the East.The districts and counties with obvious changes include 14 counties such as Tonggu County,Xinjian County and Wuyuan County.(3)The factors with the strongest explanatory power to the spatial conflict distribution are:grain yield per unit area(x6),population density(x1),reclamation rate(x5)and land average GDP(x2).It reflects the conflict between human activities and economic and agricultural development.The factors that have weak explanatory power for the distribution of spatial conflict are:the Q value of industrial land proportion(x3),land degradation index(x9)and ecological conversion area(x4)ranks low and has little influence.The reason is that the three account for a relatively small area in the study area.After the 13 factors were crossed,they were all double factor enhancement.It shows that the explanatory power of the factors after the interaction to the y value increases.After the interaction,the maximum Q value is the interaction of population density(x1)and grain yield(x6),q=0.579,the explanatory power is the strongest,and the minimum Q value is the intersection of ecological returning farmland(x4)and distance from urban trunk line(x11),q=0.143,the explanatory power is the weakest.The results of ecological exploration showed that there were significant differences between most of the 13 factors.(4)According to the zoning principle and zoning scheme,the spatial conflict of urban agglomeration around Poyang Lake is divided into three types of primary zoning and 11types of secondary zoning.Among them,the area of low altitude spatial conflict area is47671.08 km~2,accounting for 53.88%of the total area of Poyang Lake urban agglomeration;The area of zhonghaiba space conflict zone is 24079.51 km~2,accounting for 26.09%of the total area of the urban agglomeration around Poyang Lake;The area of high-altitude spatial conflict zone is 20544.39 km~2,accounting for 22.26%of the total area of Poyang Lake urban agglomeration.Among the altitude areas,the production ecological space water conservation+biodiversity conflict area and the ecological production space water conservation+biodiversity conflict area account for the largest proportion,accounting for33.11%and 32%of the low altitude areas respectively.Among the middle altitude areas,the areas of ecological production space water conservation+biodiversity+soil erosion conflict area and ecological production space water conservation+biodiversity+soil and water conservation+acid rain erosion+soil erosion conflict area account for the largest proportion,accounting for 54.47%and 42.95%of the middle altitude areas respectively.The conflict area of ecological production space water conservation+biodiversity+acid rain erosion+soil erosion accounts for the largest proportion in the high altitude area,accounting for 36.78%of the high altitude area.(5)From the perspective of spatial coordinated development and ecological security,combined with the distribution and influence mechanism of spatial conflict,this paper puts forward the Countermeasures of spatial conflict optimization.In terms of land policy,the implementation of classified management is mainly reflected in appropriately expanding the scale of construction land in key development areas;In the ecological functional areas of soil conservation and water conservation,strictly protect agricultural land,especially cultivated land and forest land,and reduce the interference to the natural ecosystem as much as possible;Areas with world cultural and natural heritage,national protected areas,national forest parks and other prohibited areas shall be managed according to the classification of core areas,buffer areas and experimental areas,and the property right relationship of agricultural and forestry land in the nature reserve shall be properly handled.In terms of industrial production space,build an industrial development pattern with Poyang Lake as the"green heart",Nanchang as the core and Jiujiang,Jingdezhen,Xinyu,Yingtan and other central cities as important support.In terms of agricultural production,we will focus on building the main production areas of advantageous agricultural products,including the main production areas of Poyang Lake Plain and Gan Fu Plain.In terms of ecological protection,promote the development of rural tourism and reduce the farming radius to alleviate the restoration of vegetation in mountainous areas.The fiscal policy of ecological incentive compensates the interest loss caused by strengthening ecological environment protection in the restricted development zone.At the same time,establish a space conflict early warning mechanism to optimize the management process. |
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