Spatio-temporal Analysis On Land Ecological Sensitivity Of Yangtze River Delta

With the speeding up of economy growth and rapid urbanization in our country,in recent years,many ecological problems,such as deterioration of eco-environment,the city pollution is increasingly serious and land resource problem have emerged,seriously affected the people's health and the construction and the sustainable development of the economy.Yangtze River Delta region is the most powerful economic center of China's comprehensive strength.Rich land resources and unique geographical position make it China's most strategic development space.With the development of urban economy at the same time,the ecological land occupied by non-agricultural construction land,great changes took place in land use and had a fragile ecological environment,so ecological environment problems extrude in here.Therefore,with construction of ecological Yangtze River Delta region,doing research on the characteristics of the land use and ecosystem service value as well as its dynamic evolution,and making ecological sensitivity analysis and evaluation of Yangtze River Delta region is of great theoretical significance and practical value.On a basis of Yangtze River Delta region as the research target,collect and sort the basic data,including the basin natural,ecological environment problem,social and economic conditions and son on.Through these basic research,it provides the basis for the study of space optimization of the Yangtze River Delta,and this paper choosed two period of the year 2000 and 2014 Landsat TM images as data supporting and uses remote sensing(RS)and geographical information system(GIS)as technical base,Building the LUCC(Land Use and Land Cover)change database to help analyzing the land ecological sensitivity.First,on the basis of access to Yangtze River Delta Region land use data,from the perspective of spatial structure,quantity and extent change,land use change information models were established which contain range of land use change,speed of land use change and employing lorenz curve and gini coefficient to analysis the temporal and spatial variation characteristics of land use in Yangtze River Delta region through 2000 and 2014.Secondly,based on land use data and relevant statistical data in the Yangtze River Delta from 2000 to 2014,with the method proposed by Costanza(ESV)wherein the values of ecosystem services are calculated with regard to the value coefficients of ecosystem services per unit area in the Chinese terrestrial ecosystem and the transfer matrix of land use,this paper examined the spatio-temporal variations in the value of ecosystem services and then predicted it by Markov model.In the end,based on investigation environmental pollution,principle of ecological sensitivity and availability of data,this paper chooses five factors of nature reserve,soil texture,main road,land use type,water environment and use single factor analysis,synthetically analyses to evaluate the land ecological sensitivity of Yangtze River Delta region.From the results of ecological sensitivity evaluation,combined with the natural break method,the eco-environmental sensitivity of analysis zone is divided.Including extremel sensitive,high sensitive,mediate sensitive,low sensitive and non-sensitive.Furthermore,The author propose appropriate countermeasures to Yangtze River Delta region Suggestions and countermeasures,according to the feature of the sensitive areas.