Health assessment of karst groundwater ecosystem of Jinci spring area

The concept of karst groundwater ecosystem was proposed, and its characteristics, functions and threats were discussed in this paper. The karst groundwater ecosystem health assessment index system was constructed under the superposition of natural and human factors based on the driving force-pressure-state-impact-response (DPSIR) model. The analytic hierarchy process (AHP) was used to determine the index weights. The health status of karst groundwater ecosystem was determined by the comprehensive assessment method, which was divided into five levels， very healthy, healthy, sub-healthy, unhealthy and diseased. Taking the Jinci spring area as an example, the spatial analysis technique of ArcGIS is used to analyse the health assessment grade of karst groundwater ecosystem. The results show that the coal mining area in the spring area is in an unhealthy state, the eastern plain area and the central runoff area are in a sub-healthy state, the carbonate exposed area and the surrounding area of Fenhe river are in a healthy state, accounting for 29%, 31% and 40% of the total area of Jinci spring area, respectively.