| The development of human society and the acceleration of urbanization have a huge impact on the ecological environment,more and more agricultural land and natural land into urban land.Changes in urban vegetation and landscape patterns affect soil organic carbon content,and soil organic carbon pool influences global climate change and global carbon balance.The study of urban soil organic carbon content is essential to understand the human impact on soil carbon storage.Urban development is often restricted by many factors.scientific quantification of the“City-suburb-countryside” gradient provides a basis for the study of urbanization.Based on the remote sensing satellite image,this paper uses the grid method to evaluate the urban physical index and Landscape Pattern Index.Based on principal component analysis(PCA),a gradient model of “Urban-suburban-rural” in Hefei was constructed by using the factor analysis method,the results show the spatial heterogeneity of the urban-suburban-rural landscape pattern in Hefei,and lay a foundation for further research.The soil organic carbon content,soil bulk density,p H value,total nitrogen,total phosphorus and total potassium content were measured through field investigation and sampling,the gradient distribution characteristics of soil physical and chemical properties under different urbanization degree were analyzed,and the relationship between each other was explored.The gradient effect of urbanization process on the spatial distribution of organic carbon was analyzed from two aspects of physical and landscape factors,and the relevant models were constructed.The study concluded the following:(1)Using three urban physical indexes(ROAD,DISTANCE,PLAND2)and three urban landscape indexes(LSI,SHDI,PAFRAC)to construct the urbanized index UI model can reflect the urban landscape characteristics under the urbanization development of Hefei.The areas of-1.320 |
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