| Research on impact process of irrigation amount on moisture migration and retention in vadose zone |
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| DOI：10.7606/j.issn.1000-7601.2016.05.40 |
| Key Words: border irrigation moisture migration and retention Hydrus-1D model soil water balance leakage evaporation transpiration |
| Author Name | Affiliation | | LIU Xiu-hua | College of Environmental Science and Engineering, Chang’an University, Xi'an, Shaanxi 710054, China
Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, Chang'an University, Xi'an, Shaanxi 710054, China | | WANG Rui | College of Environmental Science and Engineering, Chang’an University, Xi'an, Shaanxi 710054, China |
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| Abstract: |
| In vadose zone, soil water is the key factor supporting vegetation growth, the connection between surface water and groundwater, and the important water source for groundwater recharge. In order to understand the impact process of moisture migration and retention by surface irrigation amount and duration in the vadose zone, field irrigation experiments were conducted on the summer corn and winter wheat in the Jinghuiqu Experimental Station. By sample collection and moisture determination using Hydrus-1D model, the process of soil moisture migration and retention at underground 0～6 m depth was simulated, and the water balance was analyzed quantitatively. The results showed that different irrigation amounts, influent flows, and durations caused obvious changes of soil moisture migration and retention in the vadose zone. In the corn test, big influent flow and rapid irrigation were adopted, and there were large amount of seepage at the bottom of boundary, accounted for 24.88% of the total infiltrated water. In the winter wheat test, small irrigation flow and long duration were used and the leakage quantity at the bottom was small, accounted for 2.29% of the surface irrigation quantity. The winter wheat test had a much longer moisture retention time than the core one. The evapotranspiration during summer corn experiment period was greater than that during the winter wheat, accounted for 32.32% and 27.33% of the infiltrated water, respectively, and 18.15% and 16.92% of the evapotranspiration, respectively. The soil water retention ratios during the summer corn and winter wheat experiment periods were 42.8% and 70.38%, respectively. Thus, this indicates that in vadose zone the irrigation influent flow and duration time are the key factors leading the soil water retention and entry into the groundwater. |
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