Analysis On Migration Characteristics Of Poyang Lake Region Ecosystem And Social Economic Gravity Center

Poyang Lake Region(PLR)is an important ecological function protected area,but also one of the most economically active areas of Jiangxi Province.At present,the potential changes of land use in PLR are studied under the dual driving of human socio-economic activities and natural factors,and the temporal and spatial characteristics of land-type ecosystems and socio-economic changes in PLR are studied.It is of great practical significance to clarify the change of regional level land use.Based on this,the Landsat TM,ETM +,OLI remote sensing images in 2005,2010,2015 were used as data sources,using RS and GIS techniques,combined with land use transfer matrix,information entropy,space Lorenz curve and center of gravity model,The spatial and temporal patterns of the forests,wetlands,farmland,grassland and so on,and the dynamic characteristics of the Habitat system in the PLR were analyzed.Secondly,the correlation between the ecosystems and the socio-economic system in the PLR was analyzed.The main results are as follows:(1)In 2005 and 2015,the land use of PLR was about 40% of the total cultivated land.However,the change of land use was significant in ten years,which was manifested in the transfer of cultivated land,grassland,unused land and residential and industrial land expansion.The information entropy of land use in the region is in the steady upward trend from 1.4343 to 1.4594,but the information entropy difference of 12 counties in PLR is narrowing,and the balance of the overall land use structure in PLR is gradually improved.The land use Lorenz curve of Poyang Lake shows that the stability of forest land and water is high.Unusual use of the situation is most significant.(2)From 2005 to 2015,the population center of gravity in PLR is consistent with the direction of GDP center of gravity movement,and migrate to the northeast.The cumulative migration distance is 13.29 km and 3.65 km respectively.Specifically,the first industry,"eastward" amplitude significantly.Secondary industry and tertiary industry movement is smaller,the overall direction consistent with GDP.Among them,the trend of the relocation of the third industry is more than that of the "eastward migration".The trend of the economic factors in the past 10 years shows that the overall development trend of the PLR is reasonable.(3)The center of gravity migration of forest ecosystem and wetland ecosystem showed a trend of reciprocity and stability.The migration distance of the agroecosystem was from west to east,and the cumulative migration distance was 16.99 km.The area of the grassland ecosystem was squeezed by other ecosystems,and the area continued to decrease.The cumulative migration of the Habitat system was 6.27 km.The movement direction from southwest to northeast showed that The trend of the developed areas is in the trend of expanding speed,the center of gravity and the center of gravity of the population gathered in the space,and the trend of the center of gravity of the major economic factors is more consistent;the focus of the secondary industry and the center of gravity of the two natural ecosystems in the forest and wetland are almost The farmland ecosystem and the primary industry focus on the spatial position of the trend closer to each other,the scientific and rational protection and utilization of farmland ecosystem for the primary industry is of great significance.(4)The correlation between ecosystem and socio-economic system in PLR is significant,and the specific proportion of forest ecosystem is positively correlated with the proportion of primary and tertiary crops.The proportion of farmland ecosystem is positively correlated with the proportion of primary industry The coefficient is 0.907 and is negatively correlated with the tertiary industry with a correlation coefficient of 0.925.The ratio of grassland ecosystem and economic system index showed a significant negative correlation,and its area continued to shrink.There are significant correlations between Habitat system and socioeconomic system.Its economic effect is bigger,but the expansion of the Habitat system needs to be reasonably controlled to avoid the deterioration of the ecological environment.