Abstract
The qualitative and single factor methods in land sensitivity evaluation always cause disadvantages such as subjectiveness, unilateralism and low precision. A new modified Land Sensitivity Evaluation Model (LSEM) based on uncertainties and grey relative relation grade is brought forward in this paper. Take hilly region of red soil like Changsha for example, in the Construction Planning for Changsha Eco-city, some ecological evaluation factors such as slope, groundsill carrying capacity, soil productivity, vegetation, soil osmosis, surface water, degree of resident land and scene value are selected by ecological field investigation with the principle of stability, independence, dominant and integration; the evaluation factors information are obtained with the help of Geography Information System(GIS) and Remote System(RS). Changsha urban expansion land ecological sensitivity is evaluated qualitatively and quantitatively by the modified land sensitivity evaluation model. As a result, the percentages of the permanently insensitive land, insensitive land, moderately sensitive land, sensitive land and highly sensitive land are respectively 14.77%, 16.64%, 24.07%, 30.91% and 13.61%; most land of Changsha is suitable for construction (the total percentage of permanently insensitive, insensitive and moderately sensitive land is 55.48%), but ecological environment must be protected in construction.