Ecological environment influence evaluation of geological exploration activities in Qinghai Province based on information value method

In order to evaluate the impact of geological exploration on ecological environment scientifically and promote the harmony between geological exploration and ecological environment, the evaluation method system based on information value method is established in this paper.Firstly, evaluation units are segmented according to the grid of 2 km×2 km in Qinghai Province, if the affected area of high-intensity geological exploration activity in each evaluation unit is 7 850 m².Secondly, information values of influences performed by four single factors, including vegetation cover type, vegetation coverage, noise and surface water resources and environment, are calculated respectively, and the comprehensive information values are calculated by GIS superposition.Thirdly, the natural breaks classification method is used to classify the comprehensive information values into five categories:-1.55-1.72, 1.72-3.48, 3.48-4.70, 4.70-6.04, 6.04-9.14, and the corresponding ecological environment impact grade is slight, light, average, moderate, and serious, respectively.The evaluation results present that the area at the stage of slight to relatively light is 670 086.5 km², accounting for 94.6% of Qinghai Province, which shows that the influence of geological exploration activities on ecological environment is limited and controllable.In the process of geological exploration, it is necessary to strengthen the environmental background investigation, implement green exploration according to various deposit types and exploration stages, pay attention to the natural restoration ability and reduce excessive artificial management so that improve the comprehensive benefits of green exploration.The evaluation results provide references for the deployment of geological exploration work in Qinghai Province.