Urbanization And Land Ecological System Based On ESV Correlation Studies

Urbanization is the dominant force in promoting regional social economic development,in the process of rapid urbanization,population expansion,the upgrading of economic structure and the urban spatial expansion leads to the spatial pattern of land use change,increase pressure on the ecosystem,directly or indirectly affects the structure and function of land ecosystem.And the change of land ecological system,and,in turn,restricts the further development of cities,especially some limits the strict in environment of high and new technology industries,will eventually be serious or weaken the urban economic,social and ecological development of coordination and sustainability.Therefore,research the relationship between urbanization and ecological environment,especially the coupling coordination between urbanization and land ecosystem services,the regional sustainable development has important theoretical and practical significance.In this article,on the basis of the research literature at home and abroad,and combining with nanjing social and economic statistical data and land change survey statistics,the degree of land use dynamic degree and land use to analyze the current land use situation of nanjing,on the basis of Excel and SPSS as auxiliary tool to assess the land ecosystem service value and its change rule,in an attempt to use STIRPAT model to find out in the process of rapid urbanization on the land ecosystem service value change the size of the influence factors and influence degree.Construct the urbanization system and index system of land ecosystem service system,using the capacitance coupling function and coupling coordination degree model,to assessment the coupling coordination of urbanization and land ecosystem services in Nanjing,and gives some suggestions for the sustainable development of cities.The results show that:(1)The land use structure of nanjing from 2005 to 2014,great changes have taken place in land use types in increasing four minus the "three",the garden land,construction land and water area increased,cultivated land,forest land,grassland and unused land decreased.The cultivated land reduced the most,followed by the unused land,woodland and grassland.Nanjing nearly 10 years of land use between composite index in 301?309,though at a higher level,there is a larger room to improve.Degree of land use change in the change of the high and low status,the land use structure of Nanjing is not stable,is still in the development period of adjustment.(2)From 2005 to 2014 in Nanjing,the land ecosystem service value declines year by year the trend,basic farmland ecosystem service value,the largest contribution by accounted for about 40%of the total ecosystem service value,the second was followed by waters,forest land,garden land and unused land.In the various service functions,water conservation,waste treatment and soil formation and protection function,the largest proportion of the value of the three accounts for around 55%of the total value of the value of the contract.(3)The use of STIRPAT model to analyze the impact degree of the social economic factors in urbanization process of Nanjing of the land ecosystem service value changes,the results show that the changes in population and urbanization rate is the Nanjing city land ecological service value in total and per capita ecological service value for the occurrence of the main driving factors of change,population and urban rate and ecosystem service value is inversely related to the role and the third industry increase accounted for the proportion of GDP and per capita GDP value relatively of ecosystem service value has little effect.(4)As a whole,nanjing comprehensive urbanization level increased from 0.1014 in 2005 to 0.7812 in 2014.presents the obvious stage characteristics,appear"growth-falling-growth",the first phase of 2005-2005,the second phase of 2008?2008.In each subsystem of urbanization,economic subsystem,the contribution rate of the comprehensive urbanization level of urbanization,the largest population urbanization subsystem.(5)The period of nanjing coupling of urbanization and land ecosystem services values are larger,between 0.6?1,only in the running-in stage in 2005,then into a high level of coupling phase.Coupling coordination degree value range between 0.53?0.74,has been in the condition of high coordination.