Study On The Degree Of Habitat Fragmentation In Built Environment Along Zijin Mountain To Shitou Mountain In Nanjing

The rapid development of cities in our country has caused the habitat fragmentation of built-up environment,which is increasing due to the destruction of construction activities,which not only lead to the loss of biodiversity and instability of city ecosystem,but also directly or indirectly hindered the sustainable development of built-up environment.Nanjing has excellent natural situation,and has a long history of urban construction.However,the human activities in the process of urban development has continuous disturbance on natural habitat.So far,the main part has been highly urbanized,where the core part from the Zijin Mountain to the Shitou Mountain has become the typical area of habitat fragmentation.This study selects the built environment habitat along the "Zijin Mountain-Shitou Mountain" as the research object.Firstly,it interprets the process of the built environment space under human interference through the spatial distribution changes of the region in the past.Then focused on the change of the spatial pattern of the region in the past forty years,it discusses the problems of the current land distribution and fragmentation of habitat in the main area of the city.The researching part used ENVI to obtain the enhancement process of the initial remote images,and used Arc Map to recognize and obtain the classified using types of land.Then,with the establishment of habitat fragmentation evaluation index system,it used Fragstats to obtain the habitat pattern index quantitative calculation comprehensive analysis of the research area in about 40 years at the patch type and landscape level.In addition,Arc Map’s spatial auto-correlation analysis function helped to make statistics of spatial correlation distribution in various time zones in the study area.The changing trend and driving factors of habitat fragmentation were concluded on the basis of the situation of land distribution.The research conclusions are progressive from three meanings: Firstly,the study of the distribution of built-up environmental land in the region during the past 40 years;Secondly,the change of habitat fragmentation value.The spatial distribution of broken habitat in 40 years and the relationship between different land use modes and habitat fragmentation degree were analyzed too.In the end,the methods of integration and optimization are proposed.The conclusions of this study have deep meaning for the restoration and optimization of the habitats of historical and cultural cities similar to the study object in this paper,which have good environment and have a long history and long-term urban human disturbance.We need to view such problems with a comprehensive and historical sight,that is,the ecological background and site texture value of historical natural habitats should not be ignored,while the disturbance of human activities have both "bilateral effects".The habitat restoration should respect the spatial pattern of existing habitats,with minimum human intervention principle to implement habitat restoration and improvement.Targeted policy suggestions have yet to be built for similar environment habitat fragmentation specific studies,in order to find common regularity and characteristics of urban problems.