To study the characteristics of fractionation of hydrogen and oxygen isotopes in evaporating water in Hengshui,a typical region of the North China Plain,two sets of outdoor water evaporation experiments with different salinities were conducted under local meteorological conditions. Water was collected from deep fresh water( TDS = 0. 61 g / L)and shallow saline water( TDS = 7. 97 g / L),respectively. The experimental results showed an exponential relationship between δD and δ18O in residual water and f( the ...