Estimation of Groundwater Evapotranspiration of Different Dominant Phreatophytes in the Mu Us Sandy Region

Groundwater evapotranspiration (ETG) estimation is an important issue in semiarid areas for groundwater resources management and environmental protection. It widely estimated by diurnal water table fluctuations. In this study, the ETG at four sites with different plants was using both soil moisture fluctuations northeastern Mu Us sandy region, order to identify utilization strategy dominant phreatophytes. level monitored ventilatory pressure transducers (Solinst LevelVent, Solinst Canada Ltd.; accuracy ±3 mm), while EM50 loggers (Decagon Devices Inc., Pullman, USA) K1 K14 simulated Hydrus-1D other observation wells. A significant spatial variation of found within a limited area, indicating poor representativeness site regional estimation. The mean values are 4.01 mm/d, 6.03 8.96 12.26 mm/d Achnatherum splendens site, Carex stenophylla Salix psammophila Populus alba respectively, whole growing season. more sensitive depth (DWT) than grass-dominated DWT tree-dominated areas. extinction depths 4.1 m, 2.4 7.1 2.9 m respectively.