Spatio Temporal Evolution Of Ecological Land And Its Driving Forces In Tianjin

Ecological land is a kind of land which is aimed to measure the health and security of a regional ecosystem.City ecological land and ecological land supply and demand has game,the spatial structure of the ecological space has a long time,the value of ecosystem services unit was not protected feasible,accompanied by a series of ecological problems,ecological land has become the focus of city development in the process of social economic development and ecological environment protection contradiction.In the construction of ecological civilization and urbanization is irreversible under the background,how to protect the land quantity and spatial distribution of ecological reasonable development,achieve win-win development of regional ecological environment and social economy,has become an urgent problem to solve.Therefore,it is of great significance to understand and explore the temporal and spatial distribution and formation mechanism of ecological land for urban land management strategy and guide the sustainable development of cities.Tianjin city in 2000,2006 and 2014 three period remote sensing image as the basic data source,using ENVI platform to get the type of interpretation of land use in Tianjin city.Using the transfer matrix,focus on analysis of Tianjin city ecological land use spatial and temporal variation characteristics of model and kernel density estimation,and quantitative detection and recognition using geographic detector effects of ecological land spatio-temporal evolution of various driving factors,aiming at existing problems of ecological land protection and put forward corresponding management countermeasures.Secondly,it will protect the natural foundation of urban development and give full play to the ecological service value of ecological land.The conclusions are as follows:(1)The ecological land in Tianjin showed a continuous decreasing trend,and the decreasing trend of Binhai New Area was the most obvious.In 2000-2006,the ecological land was converted to non ecological land area of 5.68×104hm2,which was mainly converted into arable land and construction land,non ecological land into ecological land area of3.59×104hm~2.2006-2014,ecological land into non ecological land area is 10.58×104hm2,forest and grassland mainly converted to arable land,fresh water and salt was mainly transformed into construction land,non ecological land into ecological land area is2.05×104hm2,mainly to non ecological land to ecological land transfer the forest grass and fresh water.(2)Ecological land focus falls on the Middle East of Tianjin City,was the first to the south to the north after the situation.The center of grassland and grassland is located in the north of Tianjin.The gravity center of fresh water falls in the middle of Tianjin.The center of the coastal wetland is located in the Binhai New Area,and the area of the coastal wetland is shrinking year by year.(3)In 2000-2014,the core area of ecological core in Tianjin was concentrated in the north and East,and the nuclear area was reduced.In 2006-2014 years,the area of high value area decreased,and there was no high value area in the central and southern regions.In addition to the Baodi area and Wuqing area,the nuclear area of all districts and counties showed a decreasing trend.(4)Through the method geographical detector,the explanatory power of social and economic factors to the change of ecological land is higher than that of natural factors.Six factors are considered to be the most impactive among these indicators,and their ratio of variabilities are proportion of primary industry(0.79),population(0.73),proportion of second industry(0.61),population density(0.59),GDP(0.57)and per capita GDP(0.56).Thus the regional industrial structure and population quantity are the most effective factors to the change of ecological land in Tianjin.(5)According to the Tianjin city ecological and driving force analysis results with the evolution characteristics of the future of Tianjin city shall formulate relevant laws and regulations,improve people's awareness of ecological protection,encourage research on social and economic factors,industrial structure adjustment and improvement of the city's population structure,in order to achieve sust.