Hydrochemical Characteristics and the Relationship between Surface and Groundwater in a Typical ‘Mountain–Oasis’ Ecosystem in Central Asia

Water environment monitoring is an important way to optimize the allocation and sustainable utilization of regional water resources beneficial for ensuring security resources. In order explore hydrochemical distributions in a mountain–oasis ecosystem Central Asia, surface groundwater samples from Kaidu River basin were collected over four seasons. pH values, major ions, total dissolved solids (TDS) stable isotopes determined during period 2016 2017. The results showed: (1) that most bodies study areas mildly alkaline showed significant seasonal spatial variation; (2) ?D ?18O enrichment summer autumn poverty spring winter, with higher values appearing oasis area lower mountain area; (3) HCO3?Ca2+ type, types presenting obvious inconsistency relative water; (4) rock weathering was main factor controlling composition human activities had influence on (5) water–groundwater interactions also displayed inconsistency, especially summer. interaction between river more traditional area, will be resource management utilization.