Application of DPSIR model and improved entropy method in environmental impact assessment of land use planning in Tianshui region

According to the land use planning of Tianshui in Gansu Province and based on the principle of DPSIR(driving forces- pressure- state-impact-responses) model, the index system which based on environmental impact identification and combined with the specific circumstances of Tianshui was established in this paper. The system is divided into three steps, that are target A, rule B and index C respectively. Applying the improved entropy method to assign values for indices, then the environmental impact comprehensive index was calculated and the possible environmental impact caused by the implementation of the preliminary plan of new round land use planning was predicted. Results show that the comprehensive value of environmental impact assessment of land use planning will reach up to 0.2119 in Tianshui, 1.47 times the value of original 2005. The implementation of land use planning project of Tianshui will bring good environmental benefits during the period of 2005-2020, and which is consistent with the goals of planning. The combination between DPSIR mode and improved entropy method provides a kind of new approach for environmental impact assessment of land use planning.