Estimation of Groundwater Evapotranspiration of Different Dominant Phreatophytes in the Mu Us Sandy Region
1
School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China
2
Xi’an Center of Geological Survey, China Geological Survey, Xi’an 710054, China
3
Institute of Disaster Prevention and Ecological Restoration, Xi’an Jiaotong University, Xi’an 710049, China
*
Author to whom correspondence should be addressed.
Academic Editors: Mirko Castellini, Di Prima Simone, Stewart Ryan, Biddoccu Marcella, Rahmati Mehdi and Alagna Vincenzo
Water 2021, 13(4), 440; https://doi.org/10.3390/w13040440
Received: 7 January 2021 / Revised: 1 February 2021 / Accepted: 4 February 2021 / Published: 8 February 2021
(This article belongs to the Special Issue Advances in Ecohydrology for Water Resources Optimization in Arid and Semi-arid Areas)
Groundwater evapotranspiration (ETG) estimation is an important issue in semiarid areas for groundwater resources management and environmental protection. It is widely estimated by diurnal water table fluctuations. In this study, the ETG at four sites with different plants was estimated using both diurnal water table and soil moisture fluctuations in the northeastern Mu Us sandy region, in order to identify the groundwater utilization strategy by different dominant phreatophytes. Groundwater level was monitored by ventilatory pressure transducers (Solinst LevelVent, Solinst Canada Ltd.; accuracy ±3 mm), while soil moisture was monitored using EM50 loggers (Decagon Devices Inc., Pullman, USA) in K1 and K14 and simulated by Hydrus-1D in other observation wells. A significant spatial variation of ETG was found within a limited area, indicating a poor representativeness of site ETG for regional estimation. The mean values of ETG are 4.01 mm/d, 6.03 mm/d, 8.96 mm/d, and 12.26 mm/d at the Achnatherum splendens site, Carex stenophylla site, Salix psammophila site and Populus alba site, respectively, for the whole growing season. ETG is more sensitive to depth to water table (DWT) in the Carex stenophylla site than in the Achnatherum splendens site for grass-dominated areas and more sensitive to DWT in the Populus alba site than in Salix psammophila site for tree-dominated areas. Groundwater extinction depths are estimated at 4.1 m, 2.4 m, 7.1 m, and 2.9 m in the Achnatherum splendens site, Carex stenophylla site, Salix psammophila site and Populus alba site, respectively.
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Keywords:
diurnal fluctuations; Phreatophyte; semiarid; wetland; vegetation restoration
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MDPI and ACS Style
Jia, W.; Yin, L.; Zhang, M.; Yu, K.; Wang, L.; Hu, F. Estimation of Groundwater Evapotranspiration of Different Dominant Phreatophytes in the Mu Us Sandy Region. Water 2021, 13, 440. https://doi.org/10.3390/w13040440
AMA Style
Jia W, Yin L, Zhang M, Yu K, Wang L, Hu F. Estimation of Groundwater Evapotranspiration of Different Dominant Phreatophytes in the Mu Us Sandy Region. Water. 2021; 13(4):440. https://doi.org/10.3390/w13040440
Chicago/Turabian StyleJia, Wuhui; Yin, Lihe; Zhang, Maosheng; Yu, Kun; Wang, Luchen; Hu, Fusheng. 2021. "Estimation of Groundwater Evapotranspiration of Different Dominant Phreatophytes in the Mu Us Sandy Region" Water 13, no. 4: 440. https://doi.org/10.3390/w13040440
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