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Journal of Arid Land  2014, Vol. 6 Issue (1): 44-58    DOI: 10.1007/s40333-013-0176-9
Research Articles     
Soil salt leaching under different irrigation regimes: HYDRUS-1D modelling and analysis
WenZhi ZENG, Chi XU, JingWei WU*, JieSheng HUANG
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
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Abstract  Field irrigation experiments were conducted in the Hetao Irrigation District of Inner Mongolia, China, to study the effects of irrigation regimes on salt leaching in the soil profile. The data were used to calibrate and validate the HYDRUS-1D model. The results demonstrated that the model can accurately simulate the water and salt dynamics in the soil profile. The HYDRUS-1D model was then used to simulate 15 distinct irrigation scenarios. The results of the simulation indicated that irrigation amount did not have a significant effect on soil water storage but that increases in irrigation amount could accelerate salt leaching. However, when the irrigation amount was larger than 20 cm, the acceleration was not obvious. Compared with irrigating only once, intermittent irrigation had a better effect on increasing soil water storage and salt leaching, but excessive irrigation times and intervals did not improve salt leaching. In addition, we found that the irrigation regime of 20 cm, irrigated twice at 1-d intervals, might significantly increase salt leaching in the plough layer and decrease the risks of deep seepage and groundwater contamination.

Key wordsleaf litter      litter loss      litter production      sand dune areas      vegetation restoration     
Received: 08 January 2013      Published: 10 February 2014

This work was supported by the National “Twelfth Five-Year” Plan for Science & Technology Support Program (2011BAD25B07), the State Natural Science Fund (51279142) and the Fundamental Research Fund for the Central Universities of the Ministry of Sci-ence and Technology, China. (2012206020206).

Corresponding Authors: JingWei WU   
Cite this article:

WenZhi ZENG, Chi XU, JingWei WU, JieSheng HUANG. Soil salt leaching under different irrigation regimes: HYDRUS-1D modelling and analysis. Journal of Arid Land, 2014, 6(1): 44-58.

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