Abstract:

 Land fragmentation is a land pattern that deviates from scale land management The business pattern of land fragmentation would result in decrease of land use efficiency，grain production and landscape esthetic，therefore，the research of land fragmentation has become a focused issue in land planning  and agricultural industry areas At present，there is not yet an unified measurement standard towards land fragmentation，and the degree of land fragmentation could be generally described by fragmentation index. What is most limited is that the land fragmentation mentioned is mainly aimed at farmland and ecological land，construction land is not taken into consideration This paper took Donghai County in Jiangsu province as an example，used data of different land use types that extracted from present landuse map in 2010，and converted the data to raster format with 10 m resolution to calculate the landscape index of each land use types. 7 landscape indexes from different aspects were chosen to measure the fragmentation degree at last.  By taking the method of principal component analysis，the paper calculated the comprehensive fragmentation indexes of cultivated land，infrastructure land，residential land and ecological land Furthermore，the cluster analysis was performed to investigate the spatial variation of fragmentation of each land type. From all of above analysis，the paper drew the conclusion that the fragmentation of each land use type was influenced by both natural and socialeconomic conditions，among which natural conditions were topography，hydrology，resources，and socialeconomic conditions were the level of economic development，leading industry，transportation and so on Meanwhile，there were correlations among different kinds of land use types. For the reason of cultivating convenience，the distribution of cultivated land was similar to residential land Thus there was a remarkable correlation between fragmentation of cultivated land and that of residential land，and the distribution of residential land could further affect that of infrastructure land The main reason that a negative correlation was observed between fragmentation of cultivated land and ecological land was the integrity conservation of ecological land.  Influenced by socialeconomic conditions，the distribution of infrastructure land was rather complicated. There was negative correlation between fragmentation of infrastructure land and that of ecological land In addition，the fragmentation regionalization in Donghai County conducted a specific regional characteristic. The fragmentation of all land use types showed an unitarity in some aspects，while some special areas with different properties conducted a specific fragmentation layout Studying correlations among different kinds of land use types and their spatial variation could provide scientific guides towards land use policy making，economic growth，landscape improvement and so on.