How to Protect the Karst Aquifers?

The karst aquifers are the most important water resources in Southwest China,where displays the most continuous bare karst around the world and hold about 100 million people.With the rapid expansion of the urbanization,development of the industry and agriculture,the groundwater quality has been degraded.Mineralization of the karst groundwater increases because of development of intensive agriculture.Concentrations of nitrate and sulphate increase notably as a result of the large amount of chemical fertilizer used in agriculture.Waste gas, waste water and waste residues produced in the processes of industrialization and urbanization cause groundwater acidification and an increase of pollutants such as nitrogen,phosphate,chloride,