Institute of Hydrogeology and Environmental Geology;
CAGS;
Shijiazhuang 050061;
Hebei;
China;
China University of Geosciences;
Beijing 100083;
China;
No.1 Exploration Institute of Geology and Mineral Resources;
Ji'nan 250014;
Shandong;
China;
Shandong Geological Survey;
Ji'nan 250013;
Shandong;
China;
renewable; Shandong; C and; groundwater; isotopes; attribute; have; karst; younger; lithology;