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Article

Modelling Soil Water, Salt and Heat Dynamics under Partially Mulched Conditions with Drip Irrigation, Using HYDRUS-2D

1
Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China
2
National Field Scientific Observation and Research Station on Efficient Water Use of Oasis Agriculture, Wuwei 733000, China
*
Author to whom correspondence should be addressed.
Academic Editor: Pilar Montesinos
Water 2022, 14(18), 2791; https://doi.org/10.3390/w14182791
Received: 28 July 2022 / Revised: 5 September 2022 / Accepted: 5 September 2022 / Published: 8 September 2022
(This article belongs to the Section Soil and Water)
Drip irrigation under mulch is a widely used technique in the arid region of northwest China. The partially mulched soil and the bare strips between mulched areas may complicate the migration of water, salt, and heat in soils, and cause lateral salt accumulation on bare soil surfaces. For investigating hydrothermal dynamics and salt distribution patterns under such circumstances, tank experiments with drip irrigation under plastic film on partially mulched soil were conducted under two intensities of drip irrigation (i.e., low (W1) and high (W2)) with the same total irrigation amount. The spatial distributions of soil water, temperature, and electrical conductivity were monitored accordingly. The two-dimensional (2D) model of soil water, salt, and heat transport under drip irrigation and partially mulched soil conditions was established using HYDRUS-2D, and kinetic adsorption during salt migration was considered. The results of the experiments showed that the uneven distribution of the hydrothermal state led to the accumulation of salt on the un-mulched soil surface. Water migrated from where the dripper was located, and heat accumulated mainly in the mulched soil. HYDRUS-2D matched reasonably well with the observed data, with an R2 higher than 0.54. Under the partially mulched conditions, lower intensity of drip irrigation (W1) show higher desalination efficiency in root zones, with less even lateral salt distribution. Scenario simulations further demonstrated that a larger total irrigation amount would result in a larger desalination zone, and drip irrigations with appropriate incremental intensity could improve salt leaching in the root zone with increased lateral migration of water. View Full-Text
Keywords: soil moisture; soil salinity; northwest China; kinetic adsorption; desalination efficiency; irrigation practice soil moisture; soil salinity; northwest China; kinetic adsorption; desalination efficiency; irrigation practice
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MDPI and ACS Style

Tian, H.; Bo, L.; Mao, X.; Liu, X.; Wang, Y.; Hu, Q. Modelling Soil Water, Salt and Heat Dynamics under Partially Mulched Conditions with Drip Irrigation, Using HYDRUS-2D. Water 2022, 14, 2791. https://doi.org/10.3390/w14182791

AMA Style

Tian H, Bo L, Mao X, Liu X, Wang Y, Hu Q. Modelling Soil Water, Salt and Heat Dynamics under Partially Mulched Conditions with Drip Irrigation, Using HYDRUS-2D. Water. 2022; 14(18):2791. https://doi.org/10.3390/w14182791

Chicago/Turabian Style

Tian, Huiwen, Liyuan Bo, Xiaomin Mao, Xinyu Liu, Yan Wang, and Qingyang Hu. 2022. "Modelling Soil Water, Salt and Heat Dynamics under Partially Mulched Conditions with Drip Irrigation, Using HYDRUS-2D" Water 14, no. 18: 2791. https://doi.org/10.3390/w14182791

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