Ecological risk assessment of land use in different geological background based on remote sensing

Geological background is the key factor affecting ecological environment. In order to study the Ecological Risk (ER) of land use in different background of carbonate rock, the digital land use distribution maps of a typical karst region in China was obtained, based on remote sensing and geographic information system technology and user computer interactive interpreting method from Landsat remote sensing images. Then ER information map was obtained using spatial analysis method, according to structure characteristics of land use and ER index devised. The results showed that: (1)ER index of land use in karst areas is very high as a whole.(2)The risk in dolomite areas is more than that in limestone.(3) The purer carbonate rock is,the less the risk is. Therefore, the risk of land use in karst areas showed significant spatial heterogeneity, and it is apparently constrained by lithological background of carbonate rock.